Appendix 6. Merged Working Database Source Information


3. Merged Database Table Formats

b. Merged Extended Source Information Tables

The following table contains brief descriptions of the entries in the Survey, 6x and Calibration Merged Extended Source Information Tables. The merged source tables contain the mean positions magnitudes and uncertainties for extended sources detected multiple times in each of the 2MASS data sets. The merging was carried out using an autocorrelation of the respective databases to identify groups of resolved extractions that are positionally associated with each other, all lying within a 5.0" radius circular region. A number of confirmation statistics are also provided in the tables that can be used to test for source variability, and the general quality of the merge. The merging procedure and the derived quantities are described in Section A6.1.

The order of the entries in this table is the same as that presented in the IRSA/GATOR query page for these tables.

The columns in the following table are:

Column order subject to reorganization

Column NameFormatUnitsnullsDescription
Group Identifiers, Detection Statistics and Confusion
gcntr %10d--- no Unique identifier of the merged group within a given database. This value is set to be the cntr/pts_key value of the "seed" extraction for the group (see A6.2).

The gcntr identifier is given in the individual WDB records for all extractions that are members of merged groups. Links between the cntr/pts_key WDB identifiers of the individual group members and the group identifier, gcntr, are provided in the Survey, 6x and Calibration Merged Extended Source Cross-Reference tables.

Note: gcntr is unique only within a given database. Sources in the Merged Survey, 6x and Calibration Tables with the same gcntr identifiers are not the same object on the sky.

napp %5d--- no Total number of extractions associated with this merged group. This number can be larger than the number of scans covering the group position (spos) because it can include multiple extractions within a scan and because of the approximate nature of spos.
gcnf %1d --- no Merge confusion flag. This column indicates if this merged group contains extractions that were positionally associated with more than one group.
  • "0,1" - Unconfused. All extractions in this group are associated with only one group.
  • "2,3" - Confused. One or more of the extractions in this group are associated with more than one merged group. Positions and photometry of confused groups are suspect. Close scrutiny of the group members is advised.
sdet %5d--- no Number of unique scans in which this merged source is detected in any band. If sdet < napp, then the source is artificially split in at least one scan.
Position Information
ra %10.6fdeg no Average right ascension of the merged group.

For the Survey and 6x WDBs, this is the variance-weighted average right ascension, computed using the positional uncertainties of each extraction in the group.

For the Calibration WDB, this is the unweighted average right ascension of all extractions in the group.

NOTE: All extractions within a group are used in computing the average right ascension.

dec %10.6fdeg no Average declination of the merged group.

For the Survey and 6x WDBs, this is the variance-weighted average declination, computed using the positional uncertainties of each extraction in the group.

For the Calibration WDB, this is the unweighted average declination of all extractions in the group.

NOTE: All extractions within a group are used in computing the average declination.

emj_mrg %10.4earcsec no Semi-major axis of the average position error ellipse.

For the Survey and 6x WDBs, the position error ellipse parameters are computed from the covariance of the positions of all extractions in the merged group.

For the Calibration WDB, the semi-major axis is the larger of the standard deviation of the mean right ascension or declination. If the right ascension error is larger, then emn_ang=90. If the declination error is larger, then emn_ang=0.

emn_mrg %10.4earcsecno Semi-minor axis of the average position error ellipse.

For the Survey and 6x WDBs, the position error ellipse parameters are computed from the covariance of the positions of all extractions in the merged group.

For the Calibration WDB, the semi-minor axis is the smaller of the standard deviation of the mean right ascension or declination. If the right ascension error is smaller, then emn_ang=0. If the declination error is smaller, then emn_ang=90.

ean_mrg %3d deg no Position angle of the average position error ellipse (degrees E of N).

For the Survey and 6x WDBs, the position error ellipse parameters are computed from the covariance of the positions of all extractions in the merged group.

For the Calibration WDB, ean_mrg has values of "0" or "90" only. The value indicates whether the standard deviation of the mean right ascension (ean_mrg=90) or declination (ean_mrg=0) is larger.

sep_avg %10.4edeg yes Average radial separation from mean group position for all extractions in the group.
sep_sig %10.4edegyes Standard deviation of the average radial separation from the mean group position for all extractions in group.
use_cntr %10d---yes WDB cntr/pts_key identifier of the extraction in this group that lies farthest from the edge of the scan in which it was detected. This is analogous to the algorithm used to resolve multiply-detected sources during the generation of the All-Sky XSC (V.4). However, this column does not necessarily identify extractions in the Merged Survey Extended Source WDB that were selected for the Survey or 6x XSC because not all scans were considered for Catalog selection.

This column is null if all extractions in the group lie within 10" of a scan edge.

smin %5d--- no Minimum number of scans that cover the 1.5" radius circular region centered on the mean position of the group.
smax %5d--- no Maximum number of scans that cover the 1.5" radius circular region centered on the mean position of the group.
spos %5d--- no Estimated number of scans that cover the mean group position. This number is computed assuming that the scan boundaries follow great-circles interpolated between the reconstructed 3-band coverage corners of the scan. Because the true telescope scan path sometimes deviated from great circles, and because reconstructed positions of a source from different scans will be distributed over a finite area, the number of detections of a merged source reported (napp and sdet) can sometimes exceed spos.
Photometric Information
j_m_7_avg %7.4fmagyes Average 7 arcsec radius circular aperture J magnitude of selected extractions in the merged group. This is computed using the WDB extractions that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the J-band (no upper limits included)
  • Have J-band photometric uncertainties in the range 0<j_msig_7<20
  • Extraction falls >15" from its scan edge
  • J-band 7" circular aperture measurement is unconfused (j_flg_7="0").

The average is computed by first converting the magnitudes of the individual selected extractions to flux units, evaluating the average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable J-band detections in this group is zero (j_n_7=0).

Note: Because upper limits are not included in the average, the average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

h_m_7_avg %7.4fmagyes Average 7 arcsec radius circular aperture H magnitude of selected extractions in the merged group. This is computed using the WDB extractions that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the H-band (no upper limits included)
  • Have J-band photometric uncertainties in the range 0<h_msig_7<20
  • Extraction falls >15" from its scan edge
  • H-band 7" circular aperture measurement is unconfused (h_flg_7="0").

The average is computed by first converting the magnitudes of the individual selected extractions to flux units, evaluating the average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable H-band detections in this group is zero (h_n_7=0).

Note: Because upper limits are not included in the average, the average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

k_m_7_avg %7.4fmagyes Average 7 arcsec radius circular aperture Ks magnitude of selected extractions in the merged group. This is computed using the WDB extractions that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the Ks-band (no upper limits included)
  • Have Ks-band photometric uncertainties in the range 0<k_msig_7<20
  • Extraction falls >15" from its scan edge
  • Ks-band 7" circular aperture measurement is unconfused (k_flg_7="0").

The average is computed by first converting the magnitudes of the individual selected extractions to flux units, evaluating the average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable Ks-band detections in this group is zero (k_n_7=0).

Note: Because upper limits are not included in the average, the average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

j_mstdev_7 %10.4e magyes Standard deviation of the mean 7" radius circular J band magnitude for selected extractions in the group.

If there is only one usable J-band 7" aperture measurement in the group (j_n_7=1), this column is set to 1-sigma uncertainty of that measurement (j_msig_7).

This column is null if the number of usable J-band 7" aperture measurements in the group is zero (j_n_7=0).

h_mstdev_7 %10.4e magyes Standard deviation of the mean 7" radius circular H band magnitude for selected extractions in the group.

If there is only one usable H-band 7" aperture measurement in the group (h_n_7=1), this column is set to 1-sigma uncertainty of that measurement (h_msig_7).

This column is null if the number of usable H-band 7" aperture measurements in the group is zero (h_n_7=0).

k_mstdev_7 %10.4e magyes Standard deviation of the mean 7" radius circular Ks band magnitude for selected extractions in the group.

If there is only one usable Ks-band 7" aperture measurement in the group (k_n_7=1), this column is set to 1-sigma uncertainty of that measurement (k_msig_7).

This column is null if the number of usable Ks-band 7" aperture measurements in the group is zero (k_n_7=0).

max_7_flg %1d ---yes Maximum J, H or Ks 7" radius circular aperture photometry confusion flag (j_flg_7, h_flg_7, k_flg_7) among all selected extractions in this group. Non-zero values indicate some level of stellar contamination of this extended source.
j_m_k20fe_avg %7.4fmagyes Average J isophotal fiducial elliptical aperture magnitude (j_m_k20fe) of selected extractions in the merged group. This is computed using the WDB extractions that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the J-band (no upper limits included)
  • Have J-band photometric uncertainties in the range 0<j_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • J-band "k20fe" isophotal measurement is unconfused (j_flg_k20fe="0").

The average is computed by first converting the magnitudes of the individual selected extractions to flux units, evaluating the average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable J-band detections in this group is zero (j_n_k20fe=0).

Note: Because upper limits are not included in the average, the average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

h_m_k20fe_avg %7.4fmagyes Average H isophotal fiducial elliptical aperture magnitude (h_m_k20fe) of selected extractions in the merged group. This is computed using the WDB extractions that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the H-band (no upper limits included)
  • Have H-band photometric uncertainties in the range 0<h_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • H-band "k20fe" isophotal measurement is unconfused (h_flg_k20fe="0").

The average is computed by first converting the magnitudes of the individual selected extractions to flux units, evaluating the average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable H-band detections in this group is zero (h_n_k20fe=0).

Note: Because upper limits are not included in the average, the average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

k_m_k20fe_avg %7.4fmagyes Average Ks isophotal fiducial elliptical aperture magnitude (k_m_k20fe) of selected extractions in the merged group. This is computed using the WDB extractions that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the Ks-band (no upper limits included)
  • Have Ks-band photometric uncertainties in the range 0<k_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • Ks-band "k20fe" isophotal measurement is unconfused (k_flg_k20fe="0").

The average is computed by first converting the magnitudes of the individual selected extractions to flux units, evaluating the average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable Ks-band detections in this group is zero (k_n_k20fe=0).

Note: Because upper limits are not included in the average, the average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

j_mstdev_k20fe %10.4e magyes Standard deviation of the mean "k20fe" isophotal fiducial elliptical J band magnitude for selected extractions in the group.

If there is only one usable J-band isophotal measurement in the group (j_n_k20fe=1), this column is set to the 1-sigma uncertainty of that measurement (j_msig_k20fe).

This column is null if the number of usable J-band isophotal measurements in the group is zero (j_n_k20fe=0).

h_mstdev_k20fe %10.4e magyes Standard deviation of the mean "k20fe" isophotal fiducial elliptical H band magnitude for selected extractions in the group.

If there is only one usable H-band isophotal measurement in the group (h_n_k20fe=1), this column is set to the 1-sigma uncertainty of that measurement (h_msig_k20fe).

This column is null if the number of usable H-band isophotal measurements in the group is zero (h_n_k20fe=0).

k_mstdev_k20fe %10.4e magyes Standard deviation of the mean "k20fe" isophotal fiducial elliptical Ks band magnitude for selected extractions in the group.

If there is only one usable Ks-band isophotal measurement in the group (k_n_k20fe=1), this column is set to the 1-sigma uncertainty of that measurement (k_msig_k20fe).

This column is null if the number of usable Ks-band isophotal measurements in the group is zero (k_n_k20fe=0).

max_k20fe_flg %1d ---yes Maximum J, H or Ks "k20fe" isophotal fiducial elliptical photometry confusion flag (j_flg_k20fe, h_flg_k20fe, k_flg_k20fe) among all selected extractions in this group. Non-zero values indicate some level of stellar contamination of this extended source.
j_m_7_wavg %7.4f magyes Inverse-variance-weighted average 7" circular aperture J magnitude of selected extractions in the merged group. This is computed using the magnitudes and uncertainties of all extractions that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the J-band (no upper limits included)
  • Have J-band photometric uncertainties in the range 0<j_msig_7<20
  • Extraction falls >15" from its scan edge
  • J-band 7" circular aperture measurement is unconfused (j_flg_7="0").

The average is computed by first converting the magnitudes and uncertainties of the individual selected extractions to flux units, evaluating the weighted average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable J-band detections in this group is zero (j_n_7=0).

Note: Because upper limits are not included in the average, the weighted average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

h_m_7_wavg %7.4f magyes Inverse-variance-weighted average 7" circular aperture H magnitude of selected extractions in the merged group. This is computed using the magnitudes and uncertainties of all extractions that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the H-band (no upper limits included)
  • Have H-band photometric uncertainties in the range 0<h_msig_7<20
  • Extraction falls >15" from its scan edge
  • H-band 7" circular aperture measurement is unconfused (h_flg_7="0").

The average is computed by first converting the magnitudes and uncertainties of the individual selected extractions to flux units, evaluating the weighted average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable H-band detections in this group is zero (h_n_7=0).

Note: Because upper limits are not included in the average, the weighted average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

k_m_7_wavg %7.4f magyes Inverse-variance-weighted average 7" circular aperture Ks magnitude of selected extractions in the merged group. This is computed using the magnitudes and uncertainties of all extractions that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the Ks-band (no upper limits included)
  • Have Ks-band photometric uncertainties in the range 0<k_msig_7<20
  • Extraction falls >15" from its scan edge
  • Ks-band 7" circular aperture measurement is unconfused (k_flg_7="0").

The average is computed by first converting the magnitudes and uncertainties of the individual selected extractions to flux units, evaluating the weighted average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable Ks-band detections in this group is zero (k_n_7=0).

Note: Because upper limits are not included in the average, the weighted average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

j_m_7_wunc %10.4e magyes Uncertainty of the inverse-variance-weighted average 7" circular aperture J magnitude.

If there is only one usable J-band aperture measurement in the group (j_n_7=1), this column is set to the 1-sigma uncertainty of that measurement (j_msig_7.

This column is null if the number of usable J-band detections in the group is zero (j_n_7=0).

h_m_7_wunc %10.4e magyes Uncertainty of the inverse-variance-weighted average 7" circular aperture H magnitude.

If there is only one usable H-band aperture measurement in the group (h_n_7=1), this column is set to the 1-sigma uncertainty of that measurement (h_msig_7.

This column is null if the number of usable J-band detections in the group is zero (h_n_7=0).

k_m_7_wunc %10.4e magyes Uncertainty of the inverse-variance-weighted average 7" circular aperture Ks magnitude.

If there is only one usable Ks-band aperture measurement in the group (k_n_7=1), this column is set to the 1-sigma uncertainty of that measurement (k_msig_7.

This column is null if the number of usable Ks-band detections in the group is zero (k_n_7=0).

j_m_k20fe_wavg %7.4fmagyes Inverse-variance-weighted average of the "k20fe" isophotal fiducial elliptical J magnitude of selected extractions in the merged group. This is computed using the magnitudes and uncertainties of all extractions that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the J-band (no upper limits included)
  • Have J-band photometric uncertainties in the range 0<j_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • J-band "k20fe" isophotal measurement is unconfused (j_flg_k20fe="0").

The average is computed by first converting the magnitudes and uncertainties of the individual selected extractions to flux units, evaluating the weighted average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable J-band detections in this group is zero (j_n_k20fe=0).

Note: Because upper limits are not included in the average, the weighted average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

h_m_k20fe_wavg %7.4fmagyes Inverse-variance-weighted average of the "k20fe" isophotal fiducial elliptical H magnitude of selected extractions in the merged group. This is computed using the magnitudes and uncertainties of all extractions that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the H-band (no upper limits included)
  • Have H-band photometric uncertainties in the range 0<h_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • H-band "k20fe" isophotal measurement is unconfused (h_flg_k20fe="0").

The average is computed by first converting the magnitudes and uncertainties of the individual selected extractions to flux units, evaluating the weighted average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable J-band detections in this group is zero (h_n_k20fe=0).

Note: Because upper limits are not included in the average, the weighted average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

k_m_k20fe_wavg %7.4fmagyes Inverse-variance-weighted average of the "k20fe" isophotal fiducial elliptical Ks magnitude of selected extractions in the merged group. This is computed using the magnitudes and uncertainties of all extractions that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the Ks-band (no upper limits included)
  • Have Ks-band photometric uncertainties in the range 0<k_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • Ks-band "k20fe" isophotal measurement is unconfused (k_flg_k20fe="0").

The average is computed by first converting the magnitudes and uncertainties of the individual selected extractions to flux units, evaluating the weighted average of the flux distribution, and then converting back into magnitude units.

This column is null if the number of usable J-band detections in this group is zero (k_n_k20fe=0).

Note: Because upper limits are not included in the average, the weighted average magnitude will systematically overestimate the brightness of faint sources near the sensitivity limit of the observations that are detected fewer times than are possible (sdet<spos).

j_m_k20fe_wunc %10.4e magyes Uncertainty of the inverse-variance-weighted "k20fe" isophotal fiducial elliptical J magnitude.

If there is only one usable J-band isophotal measurement in the group (j_n_k20fe=1), this column is set to the 1-sigma uncertainty of that measurement (j_msig_k20fe.

This column is null if the number of usable J-band detections in the group is zero (j_n_k20fe=0).

h_m_k20fe_wunc %10.4e magyes Uncertainty of the inverse-variance-weighted "k20fe" isophotal fiducial elliptical H magnitude.

If there is only one usable H-band isophotal measurement in the group (h_n_k20fe=1), this column is set to the 1-sigma uncertainty of that measurement (h_msig_k20fe.

This column is null if the number of usable H-band detections in the group is zero (h_n_k20fe=0).

k_m_k20fe_wunc %10.4e magyes Uncertainty of the inverse-variance-weighted "k20fe" isophotal fiducial elliptical Ks magnitude.

If there is only one usable Ks-band isophotal measurement in the group (k_n_k20fe=1), this column is set to the 1-sigma uncertainty of that measurement (k_msig_k20fe.

This column is null if the number of usable Ks-band detections in the group is zero (k_n_k20fe=0).

j_n_7 %5d ---no Number of extractions using in the average and weighted average 7" circular aperture magnitude computations. This is the subset of extractions in the group that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the J-band (no upper limits included)
  • Have J-band photometric uncertainties in the range 0<j_msig_7<20
  • Extraction falls >15" from its scan edge
  • J-band 7" circular aperture measurement is unconfused (j_flg_7="0").
h_n_7 %5d ---no Number of extractions using in the average and weighted average 7" circular aperture magnitude computations. This is the subset of extractions in the group that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the H-band (no upper limits included)
  • Have H-band photometric uncertainties in the range 0<h_msig_7<20
  • Extraction falls >15" from its scan edge
  • H-band 7" circular aperture measurement is unconfused (h_flg_7="0").
k_n_7 %5d ---no Number of extractions using in the average and weighted average 7" circular aperture magnitude computations. This is the subset of extractions in the group that meet the following criteria:

  • Have a valid (not null) 7" circular aperture measurement in the Ks-band (no upper limits included)
  • Have Ks-band photometric uncertainties in the range 0<k_msig_7<20
  • Extraction falls >15" from its scan edge
  • Ks-band 7" circular aperture measurement is unconfused (k_flg_7="0").
j_n_k20fe %5d ---no Number of extractions using in the average and weighted average "k20fe" isophotal fiducial elliptical magnitude computations. This is the subset of extractions in the group that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the J-band (no upper limits included)
  • Have J-band photometric uncertainties in the range 0<j_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • J-band "k20fe" isophotal measurement is unconfused (j_flg_k20fe="0").
h_n_k20fe %5d ---no Number of extractions using in the average and weighted average "k20fe" isophotal fiducial elliptical magnitude computations. This is the subset of extractions in the group that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the H-band (no upper limits included)
  • Have H-band photometric uncertainties in the range 0<h_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • H-band "k20fe" isophotal measurement is unconfused (h_flg_k20fe="0").
k_n_k20fe %5d ---no Number of extractions using in the average and weighted average "k20fe" isophotal fiducial elliptical magnitude computations. This is the subset of extractions in the group that meet the following criteria:

  • Have a valid (not null) "k20fe" isophotal measurement in the Ks-band (no upper limits included)
  • Have Ks-band photometric uncertainties in the range 0<k_msig_k20fe<20
  • Extraction falls >15" from its scan edge
  • J-band "k20fe" isophotal measurement is unconfused (k_flg_k20fe="0").
j_mchisq_7 %6.2f--- yes Chi-squared statistic for the distribution of selected J-band 7" circular aperture magnitudes and uncertainties in the merged group.

This column is null if there are fewer than 2 usable J-band aperture measurements in the group.

h_mchisq_7 %6.2f--- yes Chi-squared statistic for the distribution of selected H-band 7" circular aperture magnitudes and uncertainties in the merged group.

This column is null if there are fewer than 2 usable H-band aperture measurements in the group.

k_mchisq_7 %6.2f---yes Chi-squared statistic for the distribution of selected Ks-band 7" circular aperture magnitudes and uncertainties in the merged group.

This column is null if there are fewer than 2 usable Ks-band aperture measurements in the group.

j_mndev_7 %10.4e magyes Largest negative deviation from weighted average 7" circular aperture J magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable J-band aperture measurements in the group.

h_mndev_7 %10.4e magyes Largest negative deviation from weighted average 7" circular aperture H magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable H-band aperture measurements in the group.

k_mndev_7 %10.4e magyes Largest negative deviation from weighted average 7" circular aperture H magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable Ks-band aperture measurements in the group.

j_mxdev_7 %10.4e magyes Largest positive deviation from weighted average 7" circular aperture J magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable J-band aperture measurements in the group.

h_mxdev_7 %10.4e magyes Largest positive deviation from weighted average 7" circular aperture H magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable H-band aperture measurements in the group.

k_mxdev_7 %10.4e magyes Largest positive deviation from weighted average 7" circular aperture Ks magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable Ks-band aperture measurements in the group.

j_mchisq_k20fe %6.2f--- yes Chi-squared statistic for the distribution of selected J-band "k20fe" isophotal fiducial elliptical magnitudes and uncertainties in the merged group.

This column is null if there are fewer than 2 usable J-band aperture measurements in the group.

h_mchisq_k20fe %6.2f--- yes Chi-squared statistic for the distribution of selected H-band "k20fe" isophotal fiducial elliptical magnitudes and uncertainties in the merged group.

This column is null if there are fewer than 2 usable H-band aperture measurements in the group.

k_mchisq_k20fe %6.2f--- yes Chi-squared statistic for the distribution of selected Ks-band "k20fe" isophotal fiducial elliptical magnitudes and uncertainties in the merged group.

This column is null if there are fewer than 2 usable Ks-band aperture measurements in the group.

j_mndev_k20fe %10.4e magyes Largest negative deviation from weighted average "k20fe" isophotal fiducial elliptical J magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable J-band isophotal measurements in the group.

h_mndev_k20fe %10.4e magyes Largest negative deviation from weighted average "k20fe" isophotal fiducial elliptical H magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable H-band isophotal measurements in the group.

k_mndev_k20fe %10.4e magyes Largest negative deviation from weighted average "k20fe" isophotal fiducial elliptical Ks magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable Ks-band isophotal measurements in the group.

j_mxdev_k20fe %10.4e magyes Largest positive deviation from weighted average "k20fe" isophotal fiducial elliptical J magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable J-band isophotal measurements in the group.

h_mxdev_k20fe %10.4e magyes Largest positive deviation from weighted average "k20fe" isophotal fiducial elliptical H magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable H-band isophotal measurements in the group.

k_mxdev_k20fe %10.4e magyes Largest positive deviation from weighted average "k20fe" isophotal fiducial elliptical Ks magnitude among all extractions in the group, scaled by the photometric uncertainty of the extraction.

This column is null if there are fewer than 2 usable Ks-band isophotal measurements in the group.

Shape Information
r_k20fe_avg %6.1f arcsecyes Average value of the 20 mag/arcsec2 Ks elliptical isophote semi-major axis (r_k20fe) for the merged group. Individual extractions were used in the computation of the mean size only if their semi-major axis (r_k20fe), axis ratio (k_ba) and major axis position angle (k_phi) values are not null.
k_ba_avg %5.3f --- yes Average value of the 20 mag/arcsec2 Ks elliptical isophote axial ratio (k_ba) for the merged group. Individual extractions were used in the computation of the mean size only if their semi-major axis (r_k20fe), axis ratio (k_ba) and major axis position angle (k_phi) values are not null.
k_phi_avg %3d degyes Average value of the 20 mag/arcsec2 Ks elliptical isophote semi-major axis position angle (k_phi) for the merged group. Individual extractions were used in the computation of the mean size only if their semi-major axis (r_k20fe), axis ratio (k_ba) and major axis position angle (k_phi) values are not null.
k_n_shape %4d ---yes Number of extractions with valid shape parameters contributing to the average size, axial ratio and position angle computations.
r_k20fe_rms %10.4earcsecyes Standard deviation of the mean 20 mag/arcsec2 Ks elliptical isophote.
k_ba_rms %10.4e--- yes Standard deviation of the mean 20 mag/arcsec2 Ks elliptical isophote axial ratio.
k_phi_rms %10.4edegyes Standard deviation of the mean 20 mag/arcsec2 Ks elliptical isophote major axis position angle.
sup_ba_avg %5.3f ---yes Average value of the (J+H+Ks) "super-coadd" elliptical isophote axial ratio (k_ba) for the merged group. Individual extractions were used in the computation of the mean size only if their semi-major axis (sup_r_3sig), axis ratio (sup_ba) and major axis position angle (sup_phi) values are not null.
sup_phi_avg %3ddegyes Average value of the (J+H+Ks) "super-coadd" elliptical isophote major axis position angle (k_phi) for the merged group. Individual extractions were used in the computation of the mean size only if their semi-major axis (sup_r_3sig), axis ratio (sup_ba) and major axis position angle (sup_phi) values are not null.
sup_n_shape %4d---no Number of extractions with valid shape parameters contributing to the average "super-coadd" size, axial ratio and position angle computations.
sup_ba_rms %10.4e--- yes Standard deviation of the mean "super-coadd" elliptical isophote axial ratio.
sup_phi_rms %10.4edegyes Standard deviation of the mean "super-coadd" elliptical isophote major axis position angle.
Quality Information
n_dist %4d---no Number of extractions in the group that lie within 15" of a scan edge.
rel_avg %c---no Average reliability score for all extractions in the group. This is computed by converting the reliability score (rel) to an integer between 1 and 5 (rel=F and A, respectively), averaging the integers, and converting back into a letter score. Averages with fractional parts >0.5 were rounded up to the nearest integer, otherwise they were rounded down.

[Last Updated: 2006 September 28; by S. Wheelock & R. Cutri]


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