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Table: des_sva1.gold_ngmix
(The bold columns are indexed columns)
Column NameDescriptionDatatype
arateAcceptance rate. Galaxies with 0.4 < ARATE < 0.6 are considered good.REAL
coadd_objects_idUnique object identifier (can be used to match against other SVA1 catalogs)BIGINT
e_1The raw (biased) shear estimator.DOUBLE
e_2The raw (biased) shear estimator.DOUBLE
e_cov_1_1The estimated covariance matrix of (E_1, E_2).DOUBLE
e_cov_1_2The estimated covariance matrix of (E_1, E_2).DOUBLE
e_cov_2_1The estimated covariance matrix of (E_1, E_2).DOUBLE
e_cov_2_2The estimated covariance matrix of (E_1, E_2).DOUBLE
error_flagA flag describing potential problems with the shear estimate. Only objects with ERROR_FLAG == 0 should be used for any scientific analysis.INTEGER
flux_iAn estimate of the i-band flux that comes out of the same fitting process as was used for the shapes. This should only be used as a diagnostic. For accurate, calibrated fluxes, users should use the flux values in the Gold catalogs.REAL
log10_sb_iThe base 10 logarithm of an estimate of the surface brightness of the object in units of (ADU / arcsec^2). This is a derived value, calculated as log10(abs(FLUX_I / T)).REAL
mag_iAn estimate of the i-band magnitude that comes out of the same fitting process as was used for the shapes. This should only be used as a diagnostic. For accurate, calibrated fluxes, users should use the flux values in the Gold catalogs.REAL
mask_fracThe fraction of the pixels in all the postage stamps used for this galaxy that were masked for some reason (neighboring objects, dead pixels, bad columns, cosmic rays, etc.)REAL
mean_psf_e1The mean measured ellipticity and size of the PSF for the different exposures that went into the shear estimates for this galaxy.DOUBLE
mean_psf_e2The mean measured ellipticity and size of the PSF for the different exposures that went into the shear estimates for this galaxy.DOUBLE
mean_psf_tThe mean measured ellipticity and size of the PSF for the different exposures that went into the shear estimates for this galaxy.REAL
sens_1The raw sensitivity estimate for E_1. We recommend using SENS_AVG, which is the average of SENS_1 and SENS_2, for both E_1 and E_2, rather than these individual estimates.REAL
sens_2The raw sensitivity estimate for E_2. We recommend using SENS_AVG, which is the average of SENS_1 and SENS_2, for both E_1 and E_2, rather than these individual estimates.REAL
sens_avgThe sensitivity estimate. See Section 9.2 of Jarvis et al, 2015 for instructions on how the sensitivity should be applied to an ensemble of galaxies.DOUBLE
snr_rThe 'roundified' S/N estimate. See Section 7.1 of Jarvis et al, 2015 for an explanation of the differences between SNR_W and SNR_R estimates. In particular, it is recommended that any selection involving S/N beyond the cuts we have already applied should use SNR_W, not SNR_R. (This is different for im3shape!)REAL
snr_tThe estimated S/N of T.REAL
snr_t_rThe estimated S/N of T_R.REAL
snr_wThe standard optimal weight S/N estimate. See Section 7.1 of Jarvis et al, 2015 for an explanation of the differences between SNR_W and SNR_R estimates. In particular, it is recommended that any selection involving S/N beyond the cuts we have already applied should use SNR_W, not SNR_R. (This is different for im3shape!)REAL
stamp_sizeThe size (in pixels) of the postage stamp images used for this galaxy.INTEGER
tAn estimate of the size, using the T = Ixx + Iyy definition of size, in arcsec^2. See Section 8.3.2 in Jarvis et al, 2015 for a description of the difference between T and T_R size estimates. In particular, the formula for T_R is Eqn. 8.4. It is recommended that any selection involving size beyond the cuts we have already applied should use T_R, not T.REAL
t_errThe estimated uncertainty in the estimate of T.REAL
t_rAn estimate of the size that the object would have had if it were round. See Section 8.3.2 in Jarvis et al, 2015 for a description of the difference between T and T_R size estimates. In particular, the formula for T_R is Eqn. 8.4. It is recommended that any selection involving size beyond the cuts we have already applied should use T_R, not T.REAL
wThe recommended weight to use for each galaxy. See Eqn 7.12 in Jarvis et al, 2015 for the exact definition of this choice.DOUBLE