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Table: des_dr1.im3shape
(The bold columns are indexed columns)
Column NameDescriptionDatatype
bulge_fractionThe fraction of flux contained in the bulge componentdouble
c1The multiplicative bias correction c1 determined from image simulations. See details in Zuntz & Sheldon et al. 2018double
c2The multiplicative bias correction c2 determined from image simulations. See details in Zuntz & Sheldon et al. 2018double
chi2_pixelThe chi^2 per pixel in the stampdouble
coadd_objects_idY1A1 unique object IDbigint
covmat_0_0The e1-e1 covariancedouble
covmat_0_1The e1-e2 covariancedouble
covmat_1_1The e2-e2 covariancedouble
decDeclination (degrees) from the MOF catalogdouble
e1The measured ellipticity e1 in WCSdouble
e2The measured ellipticity e2 in WCSdouble
flagsQuality flagging used for bit 2^5 in flags_select. See Table METACALIBRATION flags_select at https://des.ncsa.illinois.edu/releases/y1a1/key-catalogs/key-shapeinteger
flags_selectSelection flag. 0 means use the object. See Table IM3SHAPE flags_select at https://des.ncsa.illinois.edu/releases/y1a1/key-catalogs/key-shapeinteger
likelihoodLog-likelihood. i.e. -(chi^2)/2. What a good value is depends on the stamp_size columndouble
mThe multiplicative bias correction determined from image simulations. See details in Zuntz & Sheldon et al. 2018double
mask_fractionFraction of pixels with zero weight over all exposuresdouble
nexpNumber of available exposures (i.e. number of postage stamps) for this objectinteger
psf_e1The PSF model ellipticity e1 in WCSdouble
psf_e2The PSF model ellipticity e2 in WCSdouble
psf_sizeThe PSF FWHM (arcsec)double
raRight Ascension (degrees) from the MOF catalogdouble
radiusThe half-light-radius of the object (arcsec)double
rgpp_rpPSF convolved galaxy size over PSF size, averaged over exposuresdouble
snrThe measured signal-to-noise (snr) of the objectdouble
stamp_sizeThe size of the postage stamps used in image fitting (pixels)integer
tilenameTile name of tile the object lies within. Each tile is a square of 10,000 pixels on a side, which makes up the extent of the coadd image. The position of the tile on the sky is encoded in its nameVARCHAR
weightThe object weight, which should be used in all ensemble calculations. Details of derivation are provided in Zuntz & Sheldon et al. 2018double