WFCAM Science Archive

Glossary of WSA NonSurvey attributes (UKIDSSDR2)

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

J

Name Schema Table Database Description Type Length Unit Default Value Unified Content Descriptor

j_1AperMag3 [nspid]Source WSA NonSurvey Default point/extended source J_1 mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

j_1AperMag3Err [nspid]Source WSA NonSurvey Error in default point/extended source J_1 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_1AperMag4 [nspid]Source WSA NonSurvey Extended source J_1 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

j_1AperMag4Err [nspid]Source WSA NonSurvey Error in extended source J_1 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_1AperMag6 [nspid]Source WSA NonSurvey Extended source J_1 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

j_1AperMag6Err [nspid]Source WSA NonSurvey Error in extended source J_1 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_1Class [nspid]Source WSA NonSurvey discrete image classification flag in J_1 smallint 2 -9999 CLASS_MISC

j_1ClassStat [nspid]Source WSA NonSurvey N(0,1) stellarness-of-profile statistic in J_1 real 4 -0.9999995e9 STAT_PROP

j_1Deblend [nspid]Source WSA NonSurvey flag indicating parent/child relation in J_1 int 4 -99999999 CODE_MISC

j_1Ell [nspid]Source WSA NonSurvey 1-b/a, where a/b=semi-major/minor axes in J_1 real 4 -0.9999995e9 PHYS_ELLIPTICITY

j_1eNum [nspid]MergeLog WSA NonSurvey the extension number of this J_1 detector tinyint 1 NUMBER

j_1ErrBits [nspid]Source WSA NonSurvey processing warning/error bitwise flags in J_1 int 4 -99999999 CODE_MISC

j_1Eta [nspid]Source WSA NonSurvey Offset of J_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.

j_1Gausig [nspid]Source WSA NonSurvey RMS of axes of ellipse fit in J_1 real 4 pixels -0.9999995e9 MORPH_PARAM

j_1HallMag [nspid]Source WSA NonSurvey Total point source J_1 mag real 4 mag -0.9999995e9 PHOT_MAG

j_1HallMagErr [nspid]Source WSA NonSurvey Error in total point source J_1 mag real 4 mag -0.9999995e9 ERROR

j_1mfID [nspid]MergeLog WSA NonSurvey the UID of the relevant J_1 multiframe bigint 8 ID_FRAME

j_1mh_1Ext [nspid]Source WSA NonSurvey Extended source colour J_1-H_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.

j_1mh_1ExtErr [nspid]Source WSA NonSurvey Error on extended source colour J_1-H_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.

j_1mh_1Pnt [nspid]Source WSA NonSurvey Point source colour J_1-H_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.

j_1mh_1PntErr [nspid]Source WSA NonSurvey Error on point source colour J_1-H_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.

j_1ObjID [nspid]Source WSA NonSurvey the UID of the J_1 detection bigint 8 -99999999 ID_NUMBER

j_1PA [nspid]Source WSA NonSurvey ellipse fit celestial orientation in J_1 real 4 Degrees -0.9999995e9 POS_POS-ANG

j_1PetroMag [nspid]Source WSA NonSurvey Extended source J_1 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

j_1PetroMagErr [nspid]Source WSA NonSurvey Error in extended source J_1 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

j_1ppErrBits [nspid]Source WSA NonSurvey additional WFAU post-processing error bits in J_1 int 4 -99999999 CODE_MISC

j_1PsfMag [nspid]Source WSA NonSurvey Point source profile-fitted J_1 mag real 4 mag -0.9999995e9 PHOT_MAG

j_1PsfMagErr [nspid]Source WSA NonSurvey Error in point source profile-fitted J_1 mag real 4 mag -0.9999995e9 ERROR

j_1SeqNum [nspid]Source WSA NonSurvey the running number of the J_1 detection int 4 -99999999 ID_NUMBER

j_1SerMag2D [nspid]Source WSA NonSurvey Extended source J_1 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

j_1SerMag2DErr [nspid]Source WSA NonSurvey Error in extended source J_1 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

j_1Xi [nspid]Source WSA NonSurvey Offset of J_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.

j_2AperMag3 [nspid]Source WSA NonSurvey Default point/extended source J_2 mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

j_2AperMag3Err [nspid]Source WSA NonSurvey Error in default point/extended source J_2 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_2AperMag4 [nspid]Source WSA NonSurvey Extended source J_2 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

j_2AperMag4Err [nspid]Source WSA NonSurvey Error in extended source J_2 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_2AperMag6 [nspid]Source WSA NonSurvey Extended source J_2 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

j_2AperMag6Err [nspid]Source WSA NonSurvey Error in extended source J_2 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_2Class [nspid]Source WSA NonSurvey discrete image classification flag in J_2 smallint 2 -9999 CLASS_MISC

j_2ClassStat [nspid]Source WSA NonSurvey N(0,1) stellarness-of-profile statistic in J_2 real 4 -0.9999995e9 STAT_PROP

j_2Deblend [nspid]Source WSA NonSurvey flag indicating parent/child relation in J_2 int 4 -99999999 CODE_MISC

j_2Ell [nspid]Source WSA NonSurvey 1-b/a, where a/b=semi-major/minor axes in J_2 real 4 -0.9999995e9 PHYS_ELLIPTICITY

j_2eNum [nspid]MergeLog WSA NonSurvey the extension number of this J_2 detector tinyint 1 NUMBER

j_2ErrBits [nspid]Source WSA NonSurvey processing warning/error bitwise flags in J_2 int 4 -99999999 CODE_MISC

j_2Eta [nspid]Source WSA NonSurvey Offset of J_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.

j_2Gausig [nspid]Source WSA NonSurvey RMS of axes of ellipse fit in J_2 real 4 pixels -0.9999995e9 MORPH_PARAM

j_2HallMag [nspid]Source WSA NonSurvey Total point source J_2 mag real 4 mag -0.9999995e9 PHOT_MAG

j_2HallMagErr [nspid]Source WSA NonSurvey Error in total point source J_2 mag real 4 mag -0.9999995e9 ERROR

j_2mfID [nspid]MergeLog WSA NonSurvey the UID of the relevant J_2 multiframe bigint 8 ID_FRAME

j_2ObjID [nspid]Source WSA NonSurvey the UID of the J_2 detection bigint 8 -99999999 ID_NUMBER

j_2PA [nspid]Source WSA NonSurvey ellipse fit celestial orientation in J_2 real 4 Degrees -0.9999995e9 POS_POS-ANG

j_2PetroMag [nspid]Source WSA NonSurvey Extended source J_2 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

j_2PetroMagErr [nspid]Source WSA NonSurvey Error in extended source J_2 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

j_2ppErrBits [nspid]Source WSA NonSurvey additional WFAU post-processing error bits in J_2 int 4 -99999999 CODE_MISC

j_2PsfMag [nspid]Source WSA NonSurvey Point source profile-fitted J_2 mag real 4 mag -0.9999995e9 PHOT_MAG

j_2PsfMagErr [nspid]Source WSA NonSurvey Error in point source profile-fitted J_2 mag real 4 mag -0.9999995e9 ERROR

j_2SeqNum [nspid]Source WSA NonSurvey the running number of the J_2 detection int 4 -99999999 ID_NUMBER

j_2SerMag2D [nspid]Source WSA NonSurvey Extended source J_2 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

j_2SerMag2DErr [nspid]Source WSA NonSurvey Error in extended source J_2 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

j_2Xi [nspid]Source WSA NonSurvey Offset of J_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.

j_3AperMag3 [nspid]Source WSA NonSurvey Default point/extended source J_3 mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

j_3AperMag3Err [nspid]Source WSA NonSurvey Error in default point/extended source J_3 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_3AperMag4 [nspid]Source WSA NonSurvey Extended source J_3 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

j_3AperMag4Err [nspid]Source WSA NonSurvey Error in extended source J_3 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_3AperMag6 [nspid]Source WSA NonSurvey Extended source J_3 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

j_3AperMag6Err [nspid]Source WSA NonSurvey Error in extended source J_3 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

j_3Class [nspid]Source WSA NonSurvey discrete image classification flag in J_3 smallint 2 -9999 CLASS_MISC

j_3ClassStat [nspid]Source WSA NonSurvey N(0,1) stellarness-of-profile statistic in J_3 real 4 -0.9999995e9 STAT_PROP

j_3Deblend [nspid]Source WSA NonSurvey flag indicating parent/child relation in J_3 int 4 -99999999 CODE_MISC

j_3Ell [nspid]Source WSA NonSurvey 1-b/a, where a/b=semi-major/minor axes in J_3 real 4 -0.9999995e9 PHYS_ELLIPTICITY

j_3eNum [nspid]MergeLog WSA NonSurvey the extension number of this J_3 detector tinyint 1 NUMBER

j_3ErrBits [nspid]Source WSA NonSurvey processing warning/error bitwise flags in J_3 int 4 -99999999 CODE_MISC

j_3Eta [nspid]Source WSA NonSurvey Offset of J_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.

j_3Gausig [nspid]Source WSA NonSurvey RMS of axes of ellipse fit in J_3 real 4 pixels -0.9999995e9 MORPH_PARAM

j_3HallMag [nspid]Source WSA NonSurvey Total point source J_3 mag real 4 mag -0.9999995e9 PHOT_MAG

j_3HallMagErr [nspid]Source WSA NonSurvey Error in total point source J_3 mag real 4 mag -0.9999995e9 ERROR

j_3mfID [nspid]MergeLog WSA NonSurvey the UID of the relevant J_3 multiframe bigint 8 ID_FRAME

j_3ObjID [nspid]Source WSA NonSurvey the UID of the J_3 detection bigint 8 -99999999 ID_NUMBER

j_3PA [nspid]Source WSA NonSurvey ellipse fit celestial orientation in J_3 real 4 Degrees -0.9999995e9 POS_POS-ANG

j_3PetroMag [nspid]Source WSA NonSurvey Extended source J_3 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

j_3PetroMagErr [nspid]Source WSA NonSurvey Error in extended source J_3 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

j_3ppErrBits [nspid]Source WSA NonSurvey additional WFAU post-processing error bits in J_3 int 4 -99999999 CODE_MISC

j_3PsfMag [nspid]Source WSA NonSurvey Point source profile-fitted J_3 mag real 4 mag -0.9999995e9 PHOT_MAG

j_3PsfMagErr [nspid]Source WSA NonSurvey Error in point source profile-fitted J_3 mag real 4 mag -0.9999995e9 ERROR

j_3SeqNum [nspid]Source WSA NonSurvey the running number of the J_3 detection int 4 -99999999 ID_NUMBER

j_3SerMag2D [nspid]Source WSA NonSurvey Extended source J_3 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

j_3SerMag2DErr [nspid]Source WSA NonSurvey Error in extended source J_3 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

j_3Xi [nspid]Source WSA NonSurvey Offset of J_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.

jAperMag3 [nspid]Source WSA NonSurvey Default point/extended source J mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

jAperMag3 [nspid]Source WSA NonSurvey Extended source J mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

jAperMag3 [nspid]Source WSA NonSurvey Default point/extended source J aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

jAperMag3Err [nspid]Source WSA NonSurvey Error in extended source J mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

jAperMag3Err [nspid]Source WSA NonSurvey Error in default point/extended source J mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

jAperMag4 [nspid]Source WSA NonSurvey Extended source J mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

jAperMag4 [nspid]Source WSA NonSurvey Extended source J aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

jAperMag4Err [nspid]Source WSA NonSurvey Error in extended source J mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

jAperMag6 [nspid]Source WSA NonSurvey Extended source J mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

jAperMag6 [nspid]Source WSA NonSurvey Extended source J aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

jAperMag6Err [nspid]Source WSA NonSurvey Error in extended source J mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

jClass [nspid]Source WSA NonSurvey discrete image classification flag in J smallint 2 -9999 CLASS_MISC

jClassStat [nspid]Source WSA NonSurvey N(0,1) stellarness-of-profile statistic in J real 4 -0.9999995e9 STAT_PROP

jDeblend [nspid]Source WSA NonSurvey flag indicating parent/child relation in J int 4 -99999999 CODE_MISC

jEll [nspid]Source WSA NonSurvey 1-b/a, where a/b=semi-major/minor axes in J real 4 -0.9999995e9 PHYS_ELLIPTICITY

jeNum [nspid]MergeLog WSA NonSurvey the extension number of this J detector tinyint 1 NUMBER

jErrBits [nspid]Source WSA NonSurvey processing warning/error bitwise flags in J int 4 -99999999 CODE_MISC

jEta [nspid]Source WSA NonSurvey Offset of J 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.

jGausig [nspid]Source WSA NonSurvey RMS of axes of ellipse fit in J real 4 pixels -0.9999995e9 MORPH_PARAM

jHallMag [nspid]Source WSA NonSurvey Point source J mag real 4 mag -0.9999995e9 PHOT_MAG

jHallMag [nspid]Source WSA NonSurvey Total point source J mag real 4 mag -0.9999995e9 PHOT_MAG

jHallMagErr [nspid]Source WSA NonSurvey Error in point source J mag real 4 mag -0.9999995e9 ERROR

jHallMagErr [nspid]Source WSA NonSurvey Error in total point source J mag real 4 mag -0.9999995e9 ERROR

jitterID [nspid]Multiframe WSA NonSurvey Serial number in this telescope jitter pattern {image primary HDU keyword: JITTER_I} smallint 2 -9999 ID_NUMBER

jitterX [nspid]Multiframe WSA NonSurvey X (RA) offset in tel jitter pattern {image primary HDU keyword: JITTER_X} real 4 arcsec -0.9999995e9 POS_EQ_RA_OFF

jitterY [nspid]Multiframe WSA NonSurvey Y (Dec) offset in tel jitter pattern {image primary HDU keyword: JITTER_Y} real 4 arcsec -0.9999995e9 POS_EQ_DEC_OFF

jMag [nspid]CurrentStdStarInfo, [nspid]PreviousStdStarInfo WSA NonSurvey J band total magnitude of star (from external sources if primary) real 4 mag PHOT_INT-MAG

jMag [nspid]FSstars WSA NonSurvey J band total magnitude on the MKO(UFTI) system real 4 mag PHOT_INT-MAG

jMagErr [nspid]CurrentStdStarInfo, [nspid]PreviousStdStarInfo WSA NonSurvey J band magnitude error of star real 4 mag ERROR

jMagErr [nspid]FSstars WSA NonSurvey J band magnitude error real 4 mag ERROR

jmfID [nspid]MergeLog WSA NonSurvey the UID of the relevant J multiframe bigint 8 ID_FRAME

jmhExt [nspid]Source WSA NonSurvey Extended source colour J-H 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.

jmhExt [nspid]Source WSA NonSurvey Extended source colour J-H (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.

jmhExtErr [nspid]Source WSA NonSurvey Error on extended source colour J-H 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.

jmhPnt [nspid]Source WSA NonSurvey Point source colour J-H 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.

jmhPnt [nspid]Source WSA NonSurvey Point source colour J-H (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.

jmhPnt [nspid]Source WSA NonSurvey Point source colour J-H (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.

jmhPntErr [nspid]Source WSA NonSurvey Error on point source colour J-H 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.

jmkExt [nspid]Source WSA NonSurvey Extended source colour J-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.

jmkExt [nspid]Source WSA NonSurvey Extended source colour J-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.

jmkExtErr [nspid]Source WSA NonSurvey Error on extended source colour J-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.

jmkPnt [nspid]Source WSA NonSurvey Point source colour J-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.

jmkPnt [nspid]Source WSA NonSurvey Point source colour J-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.

jmkPntErr [nspid]Source WSA NonSurvey Error on point source colour J-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.

jObjID [nspid]Source WSA NonSurvey the UID of the J detection bigint 8 -99999999 ID_NUMBER

joinCriterion [nspid]RequiredNeighbours WSA NonSurvey the join criterion (search radius for matches) real 4 arcminutes ??

jPA [nspid]Source WSA NonSurvey ellipse fit celestial orientation in J real 4 Degrees -0.9999995e9 POS_POS-ANG

jPetroMag [nspid]Source WSA NonSurvey Extended source J mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

jPetroMagErr [nspid]Source WSA NonSurvey Error in extended source J mag (Petrosian) real 4 mag -0.9999995e9 ERROR

jppErrBits [nspid]Source WSA NonSurvey additional WFAU post-processing error bits in J int 4 -99999999 CODE_MISC

jppErrBits [nspid]Source WSA NonSurvey additional WFAU post-processing error bits in J int 4 0 CODE_MISC

jPsfMag [nspid]Source WSA NonSurvey Point source profile-fitted J mag real 4 mag -0.9999995e9 PHOT_MAG

jPsfMagErr [nspid]Source WSA NonSurvey Error in point source profile-fitted J mag real 4 mag -0.9999995e9 ERROR

jSeqNum [nspid]Source WSA NonSurvey the running number of the J detection int 4 -99999999 ID_NUMBER

jSerMag2D [nspid]Source WSA NonSurvey Extended source J mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

jSerMag2DErr [nspid]Source WSA NonSurvey Error in extended source J mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

julianDayNum [nspid]CurrentNightlyExt, [nspid]DetectorSetUp, [nspid]MultiframeDetector, [nspid]MultiframeSetUp, [nspid]PreviousNightlyExt WSA NonSurvey the Julian Day number of the UKIRT night {image primary HDU keyword: UTDATE} int 4 Julian days TIME_DATE

julianDayNum [nspid]Multiframe WSA NonSurvey the Julian Day number of the UKIRT night int 4 Julian days TIME_DATE

jXi [nspid]Source WSA NonSurvey Offset of J 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.

WFAU, Institute for Astronomy,
Royal Observatory, Blackford Hill
Edinburgh, EH9 3HJ, UK
Tel +44 131 668 8356 (office)
or +44 131 668 8100 (switchboard)

wsa-support@roe.ac.uk
27/01/2009