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Table: des_dr1.im3shape
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| bulge_fraction | The fraction of flux contained in the bulge component | DOUBLE |
| c1 | The multiplicative bias correction c1 determined from image simulations. See details in Zuntz & Sheldon et al. 2018 | DOUBLE |
| c2 | The multiplicative bias correction c2 determined from image simulations. See details in Zuntz & Sheldon et al. 2018 | DOUBLE |
| chi2_pixel | The chi^2 per pixel in the stamp | DOUBLE |
| coadd_objects_id | Y1A1 unique object ID | BIGINT |
| covmat_0_0 | The e1-e1 covariance | DOUBLE |
| covmat_0_1 | The e1-e2 covariance | DOUBLE |
| covmat_1_1 | The e2-e2 covariance | DOUBLE |
| dec | Declination (degrees) from the MOF catalog | DOUBLE |
| e1 | The measured ellipticity e1 in WCS | DOUBLE |
| e2 | The measured ellipticity e2 in WCS | DOUBLE |
| flags | Quality 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-shape | INTEGER |
| flags_select | Selection flag. 0 means use the object. See Table IM3SHAPE flags_select at https://des.ncsa.illinois.edu/releases/y1a1/key-catalogs/key-shape | INTEGER |
| likelihood | Log-likelihood. i.e. -(chi^2)/2. What a good value is depends on the stamp_size column | DOUBLE |
| m | The multiplicative bias correction determined from image simulations. See details in Zuntz & Sheldon et al. 2018 | DOUBLE |
| mask_fraction | Fraction of pixels with zero weight over all exposures | DOUBLE |
| nexp | Number of available exposures (i.e. number of postage stamps) for this object | INTEGER |
| psf_e1 | The PSF model ellipticity e1 in WCS | DOUBLE |
| psf_e2 | The PSF model ellipticity e2 in WCS | DOUBLE |
| psf_size | The PSF FWHM (arcsec) | DOUBLE |
| ra | Right Ascension (degrees) from the MOF catalog | DOUBLE |
| radius | The half-light-radius of the object (arcsec) | DOUBLE |
| rgpp_rp | PSF convolved galaxy size over PSF size, averaged over exposures | DOUBLE |
| snr | The measured signal-to-noise (snr) of the object | DOUBLE |
| stamp_size | The size of the postage stamps used in image fitting (pixels) | INTEGER |
| tilename | Tile 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 name | VARCHAR |
| weight | The object weight, which should be used in all ensemble calculations. Details of derivation are provided in Zuntz & Sheldon et al. 2018 | DOUBLE |
