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

K

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

k_1AperMag3 [nspid]Source WSA NonSurvey Default point/extended source K_1 mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

k_1AperMag3Err [nspid]Source WSA NonSurvey Error in default point/extended source K_1 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_1AperMag4 [nspid]Source WSA NonSurvey Extended source K_1 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

k_1AperMag4Err [nspid]Source WSA NonSurvey Error in extended source K_1 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_1AperMag6 [nspid]Source WSA NonSurvey Extended source K_1 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

k_1AperMag6Err [nspid]Source WSA NonSurvey Error in extended source K_1 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_1Class [nspid]Source WSA NonSurvey discrete image classification flag in K_1 smallint 2 -9999 CLASS_MISC

k_1ClassStat [nspid]Source WSA NonSurvey N(0,1) stellarness-of-profile statistic in K_1 real 4 -0.9999995e9 STAT_PROP

k_1Deblend [nspid]Source WSA NonSurvey flag indicating parent/child relation in K_1 int 4 -99999999 CODE_MISC

k_1Ell [nspid]Source WSA NonSurvey 1-b/a, where a/b=semi-major/minor axes in K_1 real 4 -0.9999995e9 PHYS_ELLIPTICITY

k_1eNum [nspid]MergeLog WSA NonSurvey the extension number of this K_1 detector tinyint 1 NUMBER

k_1ErrBits [nspid]Source WSA NonSurvey processing warning/error bitwise flags in K_1 int 4 -99999999 CODE_MISC

k_1Eta [nspid]Source WSA NonSurvey Offset of K_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.

k_1Gausig [nspid]Source WSA NonSurvey RMS of axes of ellipse fit in K_1 real 4 pixels -0.9999995e9 MORPH_PARAM

k_1HallMag [nspid]Source WSA NonSurvey Total point source K_1 mag real 4 mag -0.9999995e9 PHOT_MAG

k_1HallMagErr [nspid]Source WSA NonSurvey Error in total point source K_1 mag real 4 mag -0.9999995e9 ERROR

k_1mfID [nspid]MergeLog WSA NonSurvey the UID of the relevant K_1 multiframe bigint 8 ID_FRAME

k_1ObjID [nspid]Source WSA NonSurvey the UID of the K_1 detection bigint 8 -99999999 ID_NUMBER

k_1PA [nspid]Source WSA NonSurvey ellipse fit celestial orientation in K_1 real 4 Degrees -0.9999995e9 POS_POS-ANG

k_1PetroMag [nspid]Source WSA NonSurvey Extended source K_1 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

k_1PetroMagErr [nspid]Source WSA NonSurvey Error in extended source K_1 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

k_1ppErrBits [nspid]Source WSA NonSurvey additional WFAU post-processing error bits in K_1 int 4 -99999999 CODE_MISC

k_1PsfMag [nspid]Source WSA NonSurvey Point source profile-fitted K_1 mag real 4 mag -0.9999995e9 PHOT_MAG

k_1PsfMagErr [nspid]Source WSA NonSurvey Error in point source profile-fitted K_1 mag real 4 mag -0.9999995e9 ERROR

k_1SeqNum [nspid]Source WSA NonSurvey the running number of the K_1 detection int 4 -99999999 ID_NUMBER

k_1SerMag2D [nspid]Source WSA NonSurvey Extended source K_1 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

k_1SerMag2DErr [nspid]Source WSA NonSurvey Error in extended source K_1 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

k_1Xi [nspid]Source WSA NonSurvey Offset of K_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.

k_2AperMag3 [nspid]Source WSA NonSurvey Default point/extended source K_2 mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

k_2AperMag3Err [nspid]Source WSA NonSurvey Error in default point/extended source K_2 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_2AperMag4 [nspid]Source WSA NonSurvey Extended source K_2 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

k_2AperMag4Err [nspid]Source WSA NonSurvey Error in extended source K_2 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_2AperMag6 [nspid]Source WSA NonSurvey Extended source K_2 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

k_2AperMag6Err [nspid]Source WSA NonSurvey Error in extended source K_2 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_2Class [nspid]Source WSA NonSurvey discrete image classification flag in K_2 smallint 2 -9999 CLASS_MISC

k_2ClassStat [nspid]Source WSA NonSurvey N(0,1) stellarness-of-profile statistic in K_2 real 4 -0.9999995e9 STAT_PROP

k_2Deblend [nspid]Source WSA NonSurvey flag indicating parent/child relation in K_2 int 4 -99999999 CODE_MISC

k_2Ell [nspid]Source WSA NonSurvey 1-b/a, where a/b=semi-major/minor axes in K_2 real 4 -0.9999995e9 PHYS_ELLIPTICITY

k_2eNum [nspid]MergeLog WSA NonSurvey the extension number of this K_2 detector tinyint 1 NUMBER

k_2ErrBits [nspid]Source WSA NonSurvey processing warning/error bitwise flags in K_2 int 4 -99999999 CODE_MISC

k_2Eta [nspid]Source WSA NonSurvey Offset of K_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.

k_2Gausig [nspid]Source WSA NonSurvey RMS of axes of ellipse fit in K_2 real 4 pixels -0.9999995e9 MORPH_PARAM

k_2HallMag [nspid]Source WSA NonSurvey Total point source K_2 mag real 4 mag -0.9999995e9 PHOT_MAG

k_2HallMagErr [nspid]Source WSA NonSurvey Error in total point source K_2 mag real 4 mag -0.9999995e9 ERROR

k_2mfID [nspid]MergeLog WSA NonSurvey the UID of the relevant K_2 multiframe bigint 8 ID_FRAME

k_2ObjID [nspid]Source WSA NonSurvey the UID of the K_2 detection bigint 8 -99999999 ID_NUMBER

k_2PA [nspid]Source WSA NonSurvey ellipse fit celestial orientation in K_2 real 4 Degrees -0.9999995e9 POS_POS-ANG

k_2PetroMag [nspid]Source WSA NonSurvey Extended source K_2 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

k_2PetroMagErr [nspid]Source WSA NonSurvey Error in extended source K_2 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

k_2ppErrBits [nspid]Source WSA NonSurvey additional WFAU post-processing error bits in K_2 int 4 -99999999 CODE_MISC

k_2PsfMag [nspid]Source WSA NonSurvey Point source profile-fitted K_2 mag real 4 mag -0.9999995e9 PHOT_MAG

k_2PsfMagErr [nspid]Source WSA NonSurvey Error in point source profile-fitted K_2 mag real 4 mag -0.9999995e9 ERROR

k_2SeqNum [nspid]Source WSA NonSurvey the running number of the K_2 detection int 4 -99999999 ID_NUMBER

k_2SerMag2D [nspid]Source WSA NonSurvey Extended source K_2 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

k_2SerMag2DErr [nspid]Source WSA NonSurvey Error in extended source K_2 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

k_2Xi [nspid]Source WSA NonSurvey Offset of K_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.

k_3AperMag3 [nspid]Source WSA NonSurvey Default point/extended source K_3 mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

k_3AperMag3Err [nspid]Source WSA NonSurvey Error in default point/extended source K_3 mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_3AperMag4 [nspid]Source WSA NonSurvey Extended source K_3 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

k_3AperMag4Err [nspid]Source WSA NonSurvey Error in extended source K_3 mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_3AperMag6 [nspid]Source WSA NonSurvey Extended source K_3 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

k_3AperMag6Err [nspid]Source WSA NonSurvey Error in extended source K_3 mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

k_3Class [nspid]Source WSA NonSurvey discrete image classification flag in K_3 smallint 2 -9999 CLASS_MISC

k_3ClassStat [nspid]Source WSA NonSurvey N(0,1) stellarness-of-profile statistic in K_3 real 4 -0.9999995e9 STAT_PROP

k_3Deblend [nspid]Source WSA NonSurvey flag indicating parent/child relation in K_3 int 4 -99999999 CODE_MISC

k_3Ell [nspid]Source WSA NonSurvey 1-b/a, where a/b=semi-major/minor axes in K_3 real 4 -0.9999995e9 PHYS_ELLIPTICITY

k_3eNum [nspid]MergeLog WSA NonSurvey the extension number of this K_3 detector tinyint 1 NUMBER

k_3ErrBits [nspid]Source WSA NonSurvey processing warning/error bitwise flags in K_3 int 4 -99999999 CODE_MISC

k_3Eta [nspid]Source WSA NonSurvey Offset of K_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.

k_3Gausig [nspid]Source WSA NonSurvey RMS of axes of ellipse fit in K_3 real 4 pixels -0.9999995e9 MORPH_PARAM

k_3HallMag [nspid]Source WSA NonSurvey Total point source K_3 mag real 4 mag -0.9999995e9 PHOT_MAG

k_3HallMagErr [nspid]Source WSA NonSurvey Error in total point source K_3 mag real 4 mag -0.9999995e9 ERROR

k_3mfID [nspid]MergeLog WSA NonSurvey the UID of the relevant K_3 multiframe bigint 8 ID_FRAME

k_3ObjID [nspid]Source WSA NonSurvey the UID of the K_3 detection bigint 8 -99999999 ID_NUMBER

k_3PA [nspid]Source WSA NonSurvey ellipse fit celestial orientation in K_3 real 4 Degrees -0.9999995e9 POS_POS-ANG

k_3PetroMag [nspid]Source WSA NonSurvey Extended source K_3 mag (Petrosian) real 4 mag -0.9999995e9 PHOT_MAG

k_3PetroMagErr [nspid]Source WSA NonSurvey Error in extended source K_3 mag (Petrosian) real 4 mag -0.9999995e9 ERROR

k_3ppErrBits [nspid]Source WSA NonSurvey additional WFAU post-processing error bits in K_3 int 4 -99999999 CODE_MISC

k_3PsfMag [nspid]Source WSA NonSurvey Point source profile-fitted K_3 mag real 4 mag -0.9999995e9 PHOT_MAG

k_3PsfMagErr [nspid]Source WSA NonSurvey Error in point source profile-fitted K_3 mag real 4 mag -0.9999995e9 ERROR

k_3SeqNum [nspid]Source WSA NonSurvey the running number of the K_3 detection int 4 -99999999 ID_NUMBER

k_3SerMag2D [nspid]Source WSA NonSurvey Extended source K_3 mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

k_3SerMag2DErr [nspid]Source WSA NonSurvey Error in extended source K_3 mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

k_3Xi [nspid]Source WSA NonSurvey Offset of K_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.

kAperMag3 [nspid]Source WSA NonSurvey Extended source K mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

kAperMag3 [nspid]Source WSA NonSurvey Default point/extended source K mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

kAperMag3 [nspid]Source WSA NonSurvey Default point/extended source K aperture corrected mag (2.0 arcsec aperture diameter)
If in doubt use this flux estimator real 4 mag -0.9999995e9 PHOT_MAG

kAperMag3Err [nspid]Source WSA NonSurvey Error in extended source K mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

kAperMag3Err [nspid]Source WSA NonSurvey Error in default point/extended source K mag (2.0 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

kAperMag4 [nspid]Source WSA NonSurvey Extended source K mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

kAperMag4 [nspid]Source WSA NonSurvey Extended source K aperture corrected mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

kAperMag4Err [nspid]Source WSA NonSurvey Error in extended source K mag (2.8 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

kAperMag6 [nspid]Source WSA NonSurvey Extended source K mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

kAperMag6 [nspid]Source WSA NonSurvey Extended source K aperture corrected mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 PHOT_MAG

kAperMag6Err [nspid]Source WSA NonSurvey Error in extended source K mag (5.7 arcsec aperture diameter) real 4 mag -0.9999995e9 ERROR

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

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

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

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

keNum [nspid]MergeLog WSA NonSurvey the extension number of this K detector tinyint 1 NUMBER

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

kEta [nspid]Source WSA NonSurvey Offset of K 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.

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

kHallMag [nspid]Source WSA NonSurvey Point source K mag real 4 mag -0.9999995e9 PHOT_MAG

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

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

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

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

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

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

kMagErr [nspid]FSstars WSA NonSurvey K band magnitude error real 4 mag ERROR

kmfID [nspid]MergeLog WSA NonSurvey the UID of the relevant K multiframe bigint 8 ID_FRAME

kmh2Ext [nspid]Source WSA NonSurvey Extended source colour K-H2 (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.

kmh2Ext [nspid]Source WSA NonSurvey Extended source colour K-H2 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.

kmh2ExtErr [nspid]Source WSA NonSurvey Error on extended source colour K-H2 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.

kmh2Pnt [nspid]Source WSA NonSurvey Point source colour K-H2 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.

kmh2Pnt [nspid]Source WSA NonSurvey Point source colour K-H2 (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.

kmh2Pnt [nspid]Source WSA NonSurvey Point source colour K-H2 (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.

kmh2PntErr [nspid]Source WSA NonSurvey Error on point source colour K-H2 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.

kObjID [nspid]Source WSA NonSurvey the UID of the K detection bigint 8 -99999999 ID_NUMBER

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

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

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

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

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

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

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

kronFlux [nspid]Detection WSA NonSurvey flux within circular aperture to k × r_k ; k = 2 {catalogue TType keyword: Kron_flux} real 4 ADU PHOT_INTENSITY_ADU

kronFluxErr [nspid]Detection WSA NonSurvey error on Kron flux {catalogue TType keyword: Kron_flux_err} real 4 ADU ERROR

kronMag [nspid]Detection WSA NonSurvey Calibrated Kron magnitude within circular aperture r_k real 4 mag PHOT_INT-MAG

kronMagErr [nspid]Detection WSA NonSurvey error on calibrated Kron magnitude real 4 mag ERROR

kronRad [nspid]Detection WSA NonSurvey r_k as defined in Bertin and Arnouts 1996 A&A Supp 117 393 {catalogue TType keyword: Kron_radius} real 4 pixels EXTENSION_RAD

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

kSerMag2D [nspid]Source WSA NonSurvey Extended source K mag (profile-fitted) real 4 mag -0.9999995e9 PHOT_MAG

kSerMag2DErr [nspid]Source WSA NonSurvey Error in extended source K mag (profile-fitted) real 4 mag -0.9999995e9 ERROR

kXi [nspid]Source WSA NonSurvey Offset of K 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