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nonSurvey ** Announcement - Workshop: Science from UKIDSS II, 15-17 Dec 2008, London UK ** |
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Glossary of WSA NonSurvey attributes (UKIDSSDR2) |
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This Glossary alphabetically lists all attributes used in the WSA NonSurvey database(s) held in the WSA. If you would like to have more information about the schema tables please use the Schema Browser (other Browser versions). |
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
H | ||||||||
|---|---|---|---|---|---|---|---|---|
| Name | Schema Table | Database | Description | Type | Length | Unit | Default Value | Unified Content Descriptor |
| h2AperMag3 | [nspid]Source | WSA NonSurvey | Extended source H2 mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2AperMag3 | [nspid]Source | WSA NonSurvey | Default point/extended source H2 mag (2.0 arcsec aperture diameter) If in doubt use this flux estimator |
real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2AperMag3 | [nspid]Source | WSA NonSurvey | Default point/extended source H2 aperture corrected mag (2.0 arcsec aperture diameter) If in doubt use this flux estimator |
real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2AperMag3Err | [nspid]Source | WSA NonSurvey | Error in extended source H2 mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h2AperMag3Err | [nspid]Source | WSA NonSurvey | Error in default point/extended source H2 mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h2AperMag4 | [nspid]Source | WSA NonSurvey | Extended source H2 aperture corrected mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2AperMag4 | [nspid]Source | WSA NonSurvey | Extended source H2 mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2AperMag4Err | [nspid]Source | WSA NonSurvey | Error in extended source H2 mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h2AperMag6 | [nspid]Source | WSA NonSurvey | Extended source H2 aperture corrected mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2AperMag6 | [nspid]Source | WSA NonSurvey | Extended source H2 mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2AperMag6Err | [nspid]Source | WSA NonSurvey | Error in extended source H2 mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h2Class | [nspid]Source | WSA NonSurvey | discrete image classification flag in H2 | smallint | 2 | -9999 | CLASS_MISC | |
| h2ClassStat | [nspid]Source | WSA NonSurvey | N(0,1) stellarness-of-profile statistic in H2 | real | 4 | -0.9999995e9 | STAT_PROP | |
| h2Deblend | [nspid]Source | WSA NonSurvey | flag indicating parent/child relation in H2 | int | 4 | -99999999 | CODE_MISC | |
| h2Ell | [nspid]Source | WSA NonSurvey | 1-b/a, where a/b=semi-major/minor axes in H2 | real | 4 | -0.9999995e9 | PHYS_ELLIPTICITY | |
| h2eNum | [nspid]MergeLog | WSA NonSurvey | the extension number of this H2 detector | tinyint | 1 | NUMBER | ||
| h2ErrBits | [nspid]Source | WSA NonSurvey | processing warning/error bitwise flags in H2 | int | 4 | -99999999 | CODE_MISC | |
| h2Eta | [nspid]Source | WSA NonSurvey | Offset of H2 detection from master position (+north/-south) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_DEC_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| h2Gausig | [nspid]Source | WSA NonSurvey | RMS of axes of ellipse fit in H2 | real | 4 | pixels | -0.9999995e9 | MORPH_PARAM |
| h2HallMag | [nspid]Source | WSA NonSurvey | Point source H2 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2HallMag | [nspid]Source | WSA NonSurvey | Total point source H2 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2HallMagErr | [nspid]Source | WSA NonSurvey | Error in point source H2 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h2HallMagErr | [nspid]Source | WSA NonSurvey | Error in total point source H2 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h2Mag | [nspid]CurrentStdStarInfo, [nspid]PreviousStdStarInfo | WSA NonSurvey | H2 band total magnitude of star (from external sources if primary) | real | 4 | mag | PHOT_INT-MAG | |
| h2MagErr | [nspid]CurrentStdStarInfo, [nspid]PreviousStdStarInfo | WSA NonSurvey | H2 band magnitude error of star | real | 4 | mag | ERROR | |
| h2mfID | [nspid]MergeLog | WSA NonSurvey | the UID of the relevant H2 multiframe | bigint | 8 | ID_FRAME | ||
| h2ObjID | [nspid]Source | WSA NonSurvey | the UID of the H2 detection | bigint | 8 | -99999999 | ID_NUMBER | |
| h2PA | [nspid]Source | WSA NonSurvey | ellipse fit celestial orientation in H2 | real | 4 | Degrees | -0.9999995e9 | POS_POS-ANG |
| h2PetroMag | [nspid]Source | WSA NonSurvey | Extended source H2 mag (Petrosian) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2PetroMagErr | [nspid]Source | WSA NonSurvey | Error in extended source H2 mag (Petrosian) | real | 4 | mag | -0.9999995e9 | ERROR |
| h2ppErrBits | [nspid]Source | WSA NonSurvey | additional WFAU post-processing error bits in H2 | int | 4 | -99999999 | CODE_MISC | |
| h2ppErrBits | [nspid]Source | WSA NonSurvey | additional WFAU post-processing error bits in H2 | int | 4 | 0 | CODE_MISC | |
| h2PsfMag | [nspid]Source | WSA NonSurvey | Point source profile-fitted H2 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2PsfMagErr | [nspid]Source | WSA NonSurvey | Error in point source profile-fitted H2 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h2SeqNum | [nspid]Source | WSA NonSurvey | the running number of the H2 detection | int | 4 | -99999999 | ID_NUMBER | |
| h2SerMag2D | [nspid]Source | WSA NonSurvey | Extended source H2 mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h2SerMag2DErr | [nspid]Source | WSA NonSurvey | Error in extended source H2 mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | ERROR |
| h2Xi | [nspid]Source | WSA NonSurvey | Offset of H2 detection from master position (+east/-west) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_RA_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| h_1AperMag3 | [nspid]Source | WSA NonSurvey | Default point/extended source H_1 mag (2.0 arcsec aperture diameter) If in doubt use this flux estimator |
real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_1AperMag3Err | [nspid]Source | WSA NonSurvey | Error in default point/extended source H_1 mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_1AperMag4 | [nspid]Source | WSA NonSurvey | Extended source H_1 mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_1AperMag4Err | [nspid]Source | WSA NonSurvey | Error in extended source H_1 mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_1AperMag6 | [nspid]Source | WSA NonSurvey | Extended source H_1 mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_1AperMag6Err | [nspid]Source | WSA NonSurvey | Error in extended source H_1 mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_1Class | [nspid]Source | WSA NonSurvey | discrete image classification flag in H_1 | smallint | 2 | -9999 | CLASS_MISC | |
| h_1ClassStat | [nspid]Source | WSA NonSurvey | N(0,1) stellarness-of-profile statistic in H_1 | real | 4 | -0.9999995e9 | STAT_PROP | |
| h_1Deblend | [nspid]Source | WSA NonSurvey | flag indicating parent/child relation in H_1 | int | 4 | -99999999 | CODE_MISC | |
| h_1Ell | [nspid]Source | WSA NonSurvey | 1-b/a, where a/b=semi-major/minor axes in H_1 | real | 4 | -0.9999995e9 | PHYS_ELLIPTICITY | |
| h_1eNum | [nspid]MergeLog | WSA NonSurvey | the extension number of this H_1 detector | tinyint | 1 | NUMBER | ||
| h_1ErrBits | [nspid]Source | WSA NonSurvey | processing warning/error bitwise flags in H_1 | int | 4 | -99999999 | CODE_MISC | |
| h_1Eta | [nspid]Source | WSA NonSurvey | Offset of H_1 detection from master position (+north/-south) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_DEC_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| h_1Gausig | [nspid]Source | WSA NonSurvey | RMS of axes of ellipse fit in H_1 | real | 4 | pixels | -0.9999995e9 | MORPH_PARAM |
| h_1HallMag | [nspid]Source | WSA NonSurvey | Total point source H_1 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_1HallMagErr | [nspid]Source | WSA NonSurvey | Error in total point source H_1 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h_1mfID | [nspid]MergeLog | WSA NonSurvey | the UID of the relevant H_1 multiframe | bigint | 8 | ID_FRAME | ||
| h_1mk_1Ext | [nspid]Source | WSA NonSurvey | Extended source colour H_1-K_1 | real | 4 | mag | -0.9999995e9 | PHOT_COLOR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| h_1mk_1ExtErr | [nspid]Source | WSA NonSurvey | Error on extended source colour H_1-K_1 | real | 4 | mag | -0.9999995e9 | ERROR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| h_1mk_1Pnt | [nspid]Source | WSA NonSurvey | Point source colour H_1-K_1 (using AperMag3) | real | 4 | mag | -0.9999995e9 | PHOT_COLOR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| h_1mk_1PntErr | [nspid]Source | WSA NonSurvey | Error on point source colour H_1-K_1 | real | 4 | mag | -0.9999995e9 | ERROR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| h_1ObjID | [nspid]Source | WSA NonSurvey | the UID of the H_1 detection | bigint | 8 | -99999999 | ID_NUMBER | |
| h_1PA | [nspid]Source | WSA NonSurvey | ellipse fit celestial orientation in H_1 | real | 4 | Degrees | -0.9999995e9 | POS_POS-ANG |
| h_1PetroMag | [nspid]Source | WSA NonSurvey | Extended source H_1 mag (Petrosian) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_1PetroMagErr | [nspid]Source | WSA NonSurvey | Error in extended source H_1 mag (Petrosian) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_1ppErrBits | [nspid]Source | WSA NonSurvey | additional WFAU post-processing error bits in H_1 | int | 4 | -99999999 | CODE_MISC | |
| h_1PsfMag | [nspid]Source | WSA NonSurvey | Point source profile-fitted H_1 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_1PsfMagErr | [nspid]Source | WSA NonSurvey | Error in point source profile-fitted H_1 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h_1SeqNum | [nspid]Source | WSA NonSurvey | the running number of the H_1 detection | int | 4 | -99999999 | ID_NUMBER | |
| h_1SerMag2D | [nspid]Source | WSA NonSurvey | Extended source H_1 mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_1SerMag2DErr | [nspid]Source | WSA NonSurvey | Error in extended source H_1 mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_1Xi | [nspid]Source | WSA NonSurvey | Offset of H_1 detection from master position (+east/-west) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_RA_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| h_2AperMag3 | [nspid]Source | WSA NonSurvey | Default point/extended source H_2 mag (2.0 arcsec aperture diameter) If in doubt use this flux estimator |
real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_2AperMag3Err | [nspid]Source | WSA NonSurvey | Error in default point/extended source H_2 mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_2AperMag4 | [nspid]Source | WSA NonSurvey | Extended source H_2 mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_2AperMag4Err | [nspid]Source | WSA NonSurvey | Error in extended source H_2 mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_2AperMag6 | [nspid]Source | WSA NonSurvey | Extended source H_2 mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_2AperMag6Err | [nspid]Source | WSA NonSurvey | Error in extended source H_2 mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_2Class | [nspid]Source | WSA NonSurvey | discrete image classification flag in H_2 | smallint | 2 | -9999 | CLASS_MISC | |
| h_2ClassStat | [nspid]Source | WSA NonSurvey | N(0,1) stellarness-of-profile statistic in H_2 | real | 4 | -0.9999995e9 | STAT_PROP | |
| h_2Deblend | [nspid]Source | WSA NonSurvey | flag indicating parent/child relation in H_2 | int | 4 | -99999999 | CODE_MISC | |
| h_2Ell | [nspid]Source | WSA NonSurvey | 1-b/a, where a/b=semi-major/minor axes in H_2 | real | 4 | -0.9999995e9 | PHYS_ELLIPTICITY | |
| h_2eNum | [nspid]MergeLog | WSA NonSurvey | the extension number of this H_2 detector | tinyint | 1 | NUMBER | ||
| h_2ErrBits | [nspid]Source | WSA NonSurvey | processing warning/error bitwise flags in H_2 | int | 4 | -99999999 | CODE_MISC | |
| h_2Eta | [nspid]Source | WSA NonSurvey | Offset of H_2 detection from master position (+north/-south) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_DEC_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| h_2Gausig | [nspid]Source | WSA NonSurvey | RMS of axes of ellipse fit in H_2 | real | 4 | pixels | -0.9999995e9 | MORPH_PARAM |
| h_2HallMag | [nspid]Source | WSA NonSurvey | Total point source H_2 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_2HallMagErr | [nspid]Source | WSA NonSurvey | Error in total point source H_2 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h_2mfID | [nspid]MergeLog | WSA NonSurvey | the UID of the relevant H_2 multiframe | bigint | 8 | ID_FRAME | ||
| h_2ObjID | [nspid]Source | WSA NonSurvey | the UID of the H_2 detection | bigint | 8 | -99999999 | ID_NUMBER | |
| h_2PA | [nspid]Source | WSA NonSurvey | ellipse fit celestial orientation in H_2 | real | 4 | Degrees | -0.9999995e9 | POS_POS-ANG |
| h_2PetroMag | [nspid]Source | WSA NonSurvey | Extended source H_2 mag (Petrosian) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_2PetroMagErr | [nspid]Source | WSA NonSurvey | Error in extended source H_2 mag (Petrosian) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_2ppErrBits | [nspid]Source | WSA NonSurvey | additional WFAU post-processing error bits in H_2 | int | 4 | -99999999 | CODE_MISC | |
| h_2PsfMag | [nspid]Source | WSA NonSurvey | Point source profile-fitted H_2 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_2PsfMagErr | [nspid]Source | WSA NonSurvey | Error in point source profile-fitted H_2 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h_2SeqNum | [nspid]Source | WSA NonSurvey | the running number of the H_2 detection | int | 4 | -99999999 | ID_NUMBER | |
| h_2SerMag2D | [nspid]Source | WSA NonSurvey | Extended source H_2 mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_2SerMag2DErr | [nspid]Source | WSA NonSurvey | Error in extended source H_2 mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_2Xi | [nspid]Source | WSA NonSurvey | Offset of H_2 detection from master position (+east/-west) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_RA_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| h_3AperMag3 | [nspid]Source | WSA NonSurvey | Default point/extended source H_3 mag (2.0 arcsec aperture diameter) If in doubt use this flux estimator |
real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_3AperMag3Err | [nspid]Source | WSA NonSurvey | Error in default point/extended source H_3 mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_3AperMag4 | [nspid]Source | WSA NonSurvey | Extended source H_3 mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_3AperMag4Err | [nspid]Source | WSA NonSurvey | Error in extended source H_3 mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_3AperMag6 | [nspid]Source | WSA NonSurvey | Extended source H_3 mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_3AperMag6Err | [nspid]Source | WSA NonSurvey | Error in extended source H_3 mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_3Class | [nspid]Source | WSA NonSurvey | discrete image classification flag in H_3 | smallint | 2 | -9999 | CLASS_MISC | |
| h_3ClassStat | [nspid]Source | WSA NonSurvey | N(0,1) stellarness-of-profile statistic in H_3 | real | 4 | -0.9999995e9 | STAT_PROP | |
| h_3Deblend | [nspid]Source | WSA NonSurvey | flag indicating parent/child relation in H_3 | int | 4 | -99999999 | CODE_MISC | |
| h_3Ell | [nspid]Source | WSA NonSurvey | 1-b/a, where a/b=semi-major/minor axes in H_3 | real | 4 | -0.9999995e9 | PHYS_ELLIPTICITY | |
| h_3eNum | [nspid]MergeLog | WSA NonSurvey | the extension number of this H_3 detector | tinyint | 1 | NUMBER | ||
| h_3ErrBits | [nspid]Source | WSA NonSurvey | processing warning/error bitwise flags in H_3 | int | 4 | -99999999 | CODE_MISC | |
| h_3Eta | [nspid]Source | WSA NonSurvey | Offset of H_3 detection from master position (+north/-south) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_DEC_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| h_3Gausig | [nspid]Source | WSA NonSurvey | RMS of axes of ellipse fit in H_3 | real | 4 | pixels | -0.9999995e9 | MORPH_PARAM |
| h_3HallMag | [nspid]Source | WSA NonSurvey | Total point source H_3 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_3HallMagErr | [nspid]Source | WSA NonSurvey | Error in total point source H_3 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h_3mfID | [nspid]MergeLog | WSA NonSurvey | the UID of the relevant H_3 multiframe | bigint | 8 | ID_FRAME | ||
| h_3ObjID | [nspid]Source | WSA NonSurvey | the UID of the H_3 detection | bigint | 8 | -99999999 | ID_NUMBER | |
| h_3PA | [nspid]Source | WSA NonSurvey | ellipse fit celestial orientation in H_3 | real | 4 | Degrees | -0.9999995e9 | POS_POS-ANG |
| h_3PetroMag | [nspid]Source | WSA NonSurvey | Extended source H_3 mag (Petrosian) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_3PetroMagErr | [nspid]Source | WSA NonSurvey | Error in extended source H_3 mag (Petrosian) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_3ppErrBits | [nspid]Source | WSA NonSurvey | additional WFAU post-processing error bits in H_3 | int | 4 | -99999999 | CODE_MISC | |
| h_3PsfMag | [nspid]Source | WSA NonSurvey | Point source profile-fitted H_3 mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_3PsfMagErr | [nspid]Source | WSA NonSurvey | Error in point source profile-fitted H_3 mag | real | 4 | mag | -0.9999995e9 | ERROR |
| h_3SeqNum | [nspid]Source | WSA NonSurvey | the running number of the H_3 detection | int | 4 | -99999999 | ID_NUMBER | |
| h_3SerMag2D | [nspid]Source | WSA NonSurvey | Extended source H_3 mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| h_3SerMag2DErr | [nspid]Source | WSA NonSurvey | Error in extended source H_3 mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | ERROR |
| h_3Xi | [nspid]Source | WSA NonSurvey | Offset of H_3 detection from master position (+east/-west) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_RA_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| hallFlux | [nspid]Detection | WSA NonSurvey | flux within circular aperture to k × r_h; k = 5; alternative total flux {catalogue TType keyword: Hall_flux} | real | 4 | ADU | PHOT_INTENSITY_ADU | |
| hallFluxErr | [nspid]Detection | WSA NonSurvey | error on Hall flux {catalogue TType keyword: Hall_flux_err} | real | 4 | ADU | ERROR | |
| hallMag | [nspid]Detection | WSA NonSurvey | Calibrated magnitude within circular aperture r_hall | real | 4 | mag | PHOT_INT-MAG | |
| hallMagErr | [nspid]Detection | WSA NonSurvey | Calibrated error on Hall magnitude | real | 4 | mag | ERROR | |
| hallRad | [nspid]Detection | WSA NonSurvey | r_h image scale radius eg. Hall & Mackay 1984 MNRAS 210 979 {catalogue TType keyword: Hall_radius} | real | 4 | pixels | EXTENSION_RAD | |
| hAperMag3 | [nspid]Source | WSA NonSurvey | Extended source H mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hAperMag3 | [nspid]Source | WSA NonSurvey | Default point/extended source H mag (2.0 arcsec aperture diameter) If in doubt use this flux estimator |
real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hAperMag3 | [nspid]Source | WSA NonSurvey | Default point/extended source H aperture corrected mag (2.0 arcsec aperture diameter) If in doubt use this flux estimator |
real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hAperMag3Err | [nspid]Source | WSA NonSurvey | Error in extended source H mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| hAperMag3Err | [nspid]Source | WSA NonSurvey | Error in default point/extended source H mag (2.0 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| hAperMag4 | [nspid]Source | WSA NonSurvey | Extended source H mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hAperMag4 | [nspid]Source | WSA NonSurvey | Extended source H aperture corrected mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hAperMag4Err | [nspid]Source | WSA NonSurvey | Error in extended source H mag (2.8 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| hAperMag6 | [nspid]Source | WSA NonSurvey | Extended source H mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hAperMag6 | [nspid]Source | WSA NonSurvey | Extended source H aperture corrected mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hAperMag6Err | [nspid]Source | WSA NonSurvey | Error in extended source H mag (5.7 arcsec aperture diameter) | real | 4 | mag | -0.9999995e9 | ERROR |
| hClass | [nspid]Source | WSA NonSurvey | discrete image classification flag in H | smallint | 2 | -9999 | CLASS_MISC | |
| hClassStat | [nspid]Source | WSA NonSurvey | N(0,1) stellarness-of-profile statistic in H | real | 4 | -0.9999995e9 | STAT_PROP | |
| hDeblend | [nspid]Source | WSA NonSurvey | flag indicating parent/child relation in H | int | 4 | -99999999 | CODE_MISC | |
| hdtFile | [nspid]Multiframe | WSA NonSurvey | Name of global hdt file {image primary HDU keyword: HDTFILE} | varchar | 32 | NONE | ||
| hdtFileExt | [nspid]MultiframeDetector | WSA NonSurvey | Name of camera-specific hdt file {image extension keyword: HDTFILE2} | varchar | 32 | NONE | ?? | |
| hEll | [nspid]Source | WSA NonSurvey | 1-b/a, where a/b=semi-major/minor axes in H | real | 4 | -0.9999995e9 | PHYS_ELLIPTICITY | |
| heNum | [nspid]MergeLog | WSA NonSurvey | the extension number of this H detector | tinyint | 1 | NUMBER | ||
| hErrBits | [nspid]Source | WSA NonSurvey | processing warning/error bitwise flags in H | int | 4 | -99999999 | CODE_MISC | |
| hEta | [nspid]Source | WSA NonSurvey | Offset of H detection from master position (+north/-south) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_DEC_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| hGausig | [nspid]Source | WSA NonSurvey | RMS of axes of ellipse fit in H | real | 4 | pixels | -0.9999995e9 | MORPH_PARAM |
| hHallMag | [nspid]Source | WSA NonSurvey | Point source H mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hHallMag | [nspid]Source | WSA NonSurvey | Total point source H mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hHallMagErr | [nspid]Source | WSA NonSurvey | Error in point source H mag | real | 4 | mag | -0.9999995e9 | ERROR |
| hHallMagErr | [nspid]Source | WSA NonSurvey | Error in total point source H mag | real | 4 | mag | -0.9999995e9 | ERROR |
| hMag | [nspid]CurrentStdStarInfo, [nspid]PreviousStdStarInfo | WSA NonSurvey | H band total magnitude of star (from external sources if primary) | real | 4 | mag | PHOT_INT-MAG | |
| hMag | [nspid]FSstars | WSA NonSurvey | H band total magnitude on the MKO(UFTI) system | real | 4 | mag | PHOT_INT-MAG | |
| hMagErr | [nspid]CurrentStdStarInfo, [nspid]PreviousStdStarInfo | WSA NonSurvey | H band magnitude error of star | real | 4 | mag | ERROR | |
| hMagErr | [nspid]FSstars | WSA NonSurvey | H band magnitude error | real | 4 | mag | ERROR | |
| hmfID | [nspid]MergeLog | WSA NonSurvey | the UID of the relevant H multiframe | bigint | 8 | ID_FRAME | ||
| hmkExt | [nspid]Source | WSA NonSurvey | Extended source colour H-K | real | 4 | mag | -0.9999995e9 | PHOT_COLOR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| hmkExt | [nspid]Source | WSA NonSurvey | Extended source colour H-K (using aperMag3) | real | 4 | mag | -0.9999995e9 | PHOT_COLOR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| hmkExtErr | [nspid]Source | WSA NonSurvey | Error on extended source colour H-K | real | 4 | mag | -0.9999995e9 | ERROR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| hmkPnt | [nspid]Source | WSA NonSurvey | Point source colour H-K | real | 4 | mag | -0.9999995e9 | PHOT_COLOR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| hmkPnt | [nspid]Source | WSA NonSurvey | Point source colour H-K (using AperMag3) | real | 4 | mag | -0.9999995e9 | PHOT_COLOR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| hmkPnt | [nspid]Source | WSA NonSurvey | Point source colour H-K (using aperMag3) | real | 4 | mag | -0.9999995e9 | PHOT_COLOR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| hmkPntErr | [nspid]Source | WSA NonSurvey | Error on point source colour H-K | real | 4 | mag | -0.9999995e9 | ERROR |
| Default colours from pairs of adjacent passbands within a given set (e.g. Y-J, J-H and H-K for YJHK) are recorded in the merged source table for ease of querying and speedy querying via indexing of these attributes. Presently, the point-source colours and extended source colours are computed from the aperture corrected AperMag3 fixed 2 arcsec aperture diameter measures (for consistent measurement across all passbands) and generally good signal-to-noise. At some point in the future, this may be changed such that point-source colours will be computed from the PSF-fitted measures and extended source colours computed from the 2-d Sersic model profile fits. | ||||||||
| hObjID | [nspid]Source | WSA NonSurvey | the UID of the H detection | bigint | 8 | -99999999 | ID_NUMBER | |
| hourAngle | [nspid]Multiframe | WSA NonSurvey | Hour angle {image primary HDU keyword: HABASE} | real | 4 | degrees | -0.9999995e9 | |
| hPA | [nspid]Source | WSA NonSurvey | ellipse fit celestial orientation in H | real | 4 | Degrees | -0.9999995e9 | POS_POS-ANG |
| hPetroMag | [nspid]Source | WSA NonSurvey | Extended source H mag (Petrosian) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hPetroMagErr | [nspid]Source | WSA NonSurvey | Error in extended source H mag (Petrosian) | real | 4 | mag | -0.9999995e9 | ERROR |
| hppErrBits | [nspid]Source | WSA NonSurvey | additional WFAU post-processing error bits in H | int | 4 | -99999999 | CODE_MISC | |
| hppErrBits | [nspid]Source | WSA NonSurvey | additional WFAU post-processing error bits in H | int | 4 | 0 | CODE_MISC | |
| hPsfMag | [nspid]Source | WSA NonSurvey | Point source profile-fitted H mag | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hPsfMagErr | [nspid]Source | WSA NonSurvey | Error in point source profile-fitted H mag | real | 4 | mag | -0.9999995e9 | ERROR |
| hSeqNum | [nspid]Source | WSA NonSurvey | the running number of the H detection | int | 4 | -99999999 | ID_NUMBER | |
| hSerMag2D | [nspid]Source | WSA NonSurvey | Extended source H mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | PHOT_MAG |
| hSerMag2DErr | [nspid]Source | WSA NonSurvey | Error in extended source H mag (profile-fitted) | real | 4 | mag | -0.9999995e9 | ERROR |
| htmID | [nspid]CurrentAstrometry | WSA NonSurvey | Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates of device centre | bigint | 8 | -99999999 | POS_GENERAL | |
| htmID | [nspid]CurrentStdStarInfo, [nspid]Detection, [nspid]PreviousStdStarInfo, [nspid]Source | WSA NonSurvey | Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates | bigint | 8 | POS_GENERAL | ||
| htmID | [nspid]Detection | WSA NonSurvey | HTM index (20 digits) for equatorial co-ordinates | bigint | 8 | POS_GENERAL | ||
| htmID | [nspid]MergeLog | WSA NonSurvey | HTM index, 20 digits, for co-ordinates | bigint | 8 | POS_GENERAL | ||
| htmID | [nspid]PreviousAstrometry | WSA NonSurvey | Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates of device centre | bigint | 8 | POS_GENERAL | ||
| htmID | [nspid]Source | WSA NonSurvey | HTM index, 20 digits, for co-ordinate | bigint | 8 | POS_GENERAL | ||
| humidity | [nspid]Multiframe | WSA NonSurvey | Relative Humidity {image primary HDU keyword: HUMIDITY} | real | 4 | -0.9999995e9 | OBS_CONDITIONS | |
| hXi | [nspid]Source | WSA NonSurvey | Offset of H detection from master position (+east/-west) | real | 4 | arcsec | -0.9999995e9 | POS_EQ_RA_OFF |
| When associating individual passband detections into merged sources, a generous (in terms of the positional uncertainties) pairing radius of 2.0 (UKIDSS LAS and GPS; also non-survey programmes) or 1.0 (UKIDSS GPS, DXS and UDS) arcseconds is used, the higher value enabling pairing of moving sources when epoch separations may be several years. Such a large association criterion can of course lead to spurious pairings in the merged sources lists (although note that between passband pairs, handshake pairing is done: both passbands must agree that the candidate pair is their nearest neighbour for the pair to propagate through into the merged source table). In order to help filter spurious pairings out, and assuming that large positional offsets between the different passband detections are not expected (e.g. because of source motion, or larger than usual positional uncertainties) then the attributes Xi and Eta can be used to filter any pairings with suspiciously large offsets in one or more bands. For example, for a clean sample of QSOs from the LAS, you might wish to insist that the offsets in the selected sample are all below 1 arcsecond: simply add WHERE clauses into the SQL sample selection script to exclude all Xi and Eta values larger than the threshold you want. | ||||||||
| hz10cd | [nspid]Multiframe | WSA NonSurvey | Trefoil: HZ10CD {image primary HDU keyword: HZ10CD} | real | 4 | -0.9999995e9 | ||
| hz10ch | [nspid]Multiframe | WSA NonSurvey | Trefoil: HZ10CH {image primary HDU keyword: HZ10CH} | real | 4 | -0.9999995e9 | ||
| hz10sd | [nspid]Multiframe | WSA NonSurvey | Trefoil: HZ10SD {image primary HDU keyword: HZ10SD} | real | 4 | -0.9999995e9 | ||
| hz10sh | [nspid]Multiframe | WSA NonSurvey | Trefoil: HZ10SH {image primary HDU keyword: HZ10SH} | real | 4 | -0.9999995e9 | ||
| hz5cd | [nspid]Multiframe | WSA NonSurvey | Astigmatism: HZ5CD {image primary HDU keyword: HZ5CD} | real | 4 | -0.9999995e9 | ||
| hz5ch | [nspid]Multiframe | WSA NonSurvey | Astigmatism: HZ5CH {image primary HDU keyword: HZ5CH} | real | 4 | -0.9999995e9 | ||
| hz5sd | [nspid]Multiframe | WSA NonSurvey | Astigmatism: HZ5SD {image primary HDU keyword: HZ5SD} | real | 4 | -0.9999995e9 | ||
| hz5sh | [nspid]Multiframe | WSA NonSurvey | Astigmatism: HZ5SH {image primary HDU keyword: HZ5SH} | real | 4 | -0.9999995e9 | ||
| hz6cd | [nspid]Multiframe | WSA NonSurvey | Astigmatism: HZ6CD {image primary HDU keyword: HZ6CD} | real | 4 | -0.9999995e9 | ||
| hz6ch | [nspid]Multiframe | WSA NonSurvey | Astigmatism: HZ6CH {image primary HDU keyword: HZ6CH} | real | 4 | -0.9999995e9 | ||
| hz6sd | [nspid]Multiframe | WSA NonSurvey | Astigmatism: HZ6SD {image primary HDU keyword: HZ6SD} | real | 4 | -0.9999995e9 | ||
| hz6sh | [nspid]Multiframe | WSA NonSurvey | Astigmatism: HZ6SH {image primary HDU keyword: HZ6SH} | real | 4 | -0.9999995e9 | ||
| hz9cd | [nspid]Multiframe | WSA NonSurvey | Trefoil: HZ9CD {image primary HDU keyword: HZ9CD} | real | 4 | -0.9999995e9 | ||
| hz9ch | [nspid]Multiframe | WSA NonSurvey | Trefoil: HZ9CH {image primary HDU keyword: HZ9CH} | real | 4 | -0.9999995e9 | ||
| hz9sd | [nspid]Multiframe | WSA NonSurvey | Trefoil: HZ9SD {image primary HDU keyword: HZ9SD} | real | 4 | -0.9999995e9 | ||
| hz9sh | [nspid]Multiframe | WSA NonSurvey | Trefoil: HZ9SH {image primary HDU keyword: HZ9SH} | real | 4 | -0.9999995e9 | ||
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27/01/2009