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Table: des_sva1.gold_im3shape
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| chi2 | The chi^2 per pixel of the fitted galaxy model. | REAL |
| coadd_objects_id | Unique object identifier (can be used to match against other SVA1 catalogs) | BIGINT |
| dec_shift | The shift in the nominal centroid position of the galaxy model relative to the DEC position from the SVA1 Gold catalog. (arcsec) | REAL |
| e_1 | The raw (biased) shear estimator. | DOUBLE |
| e_2 | The raw (biased) shear estimator. | DOUBLE |
| error_flag | Describes potential problems with the shear estimate. Objects with non-zero ERROR_FLAG should not be used for any scientific analysis. | INTEGER |
| flux_r | An estimate of the r-band flux (in ADU) 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 |
| info_flag | Describes potential problems with the shear estimate. Objects with non-zero INFO_FLAG may be acceptable for some use cases, but the conservative selection is to only use objects with INFO_FLAG == 0. | INTEGER |
| is_bulge | 1 if the model used was a bulge model, 0 if it was a disc model. | INTEGER |
| likelihood | The likelihood of the fitted galaxy model. | REAL |
| mean_psf_e1 | The mean measured ellipticity and size of the PSF for the different exposures that went into the shear estimates for this galaxy. | DOUBLE |
| mean_psf_e2 | The mean measured ellipticity and size of the PSF for the different exposures that went into the shear estimates for this galaxy. | DOUBLE |
| mean_psf_fwhm | The mean measured ellipticity and size of the PSF for the different exposures that went into the shear estimates for this galaxy. | REAL |
| mean_rgpp_rp | The mean value of the radius of the observed object divided by the radius of the PSF among the different observations of the galaxy. | REAL |
| nbc_c1 | Noise Bias Correction. The additive bias correction for e_1. | DOUBLE |
| nbc_c2 | Noise Bias Correction. The additive bias correction for e_2. | DOUBLE |
| nbc_m | Noise Bias Correction. The multiplicative bias correction. | DOUBLE |
| n_exposure | The number of exposures used for constraining the model of the galaxy. | INTEGER |
| radius | An estimate of the radius of the galaxy in arcsec. | REAL |
| ra_shift | The shift in the nominal centroid position of the galaxy model relative to the RA position from the SVA1 Gold catalog. (arcsec) | REAL |
| snr_r | The 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 ngmix!) | REAL |
| snr_w | The 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 ngmix!) | REAL |
| stamp_size | The size (in pixels) of the postage stamp images used for this galaxy. | INTEGER |
| w | The recommended weight to use for each galaxy. See Section 7.3.4 in Jarvis et al, 2015 for the method used to construct the weights. | DOUBLE |
