ACS-GC README File created: Roger L. Griffith 01-25-09 modified: 03-2012 this file describes the parameters for the ACS-GC public morphology catalog created by Roger L. Griffith (JPL-UC Berkeley) the hi and low appended to most parameters refers to the wavelength of the imaging used to derive the parameters. these catalogs have been made available by the GALAPAGOS code written by Marco Barden et al. from the GEMS team. the ACS-GC paper to reference can be found at http://arxiv.org/abs/1203.1651 the GALAPAGOS paper to reference can be found at http://arxiv.org/abs/1203.1831 The erros quoted in the structural parameters come directly from Galfit, please refer to (Haussler et al. 2007ApJS..172..615H) for a description of the error uncertainties returned by Galfit/Galapagos. --------------------------------------------------------------------- Naming Convention in the ACS-GC EGS imaging OBJNO < 20000000 hi = I band 814 nm low = V band 606 nm GEMS + GOODS-S imaging 90000000 < OBJNO < 91000000 hi = z band 850 nm low = V band 606 nm GOODS-N imaging 50000000 < OBJNO < 60000000 hi = i band 775 nm low = V band 606 nm COSMOS imaging 20000000 < OBJNO < 30000000 hi = I band 814 nm --------------------------------------------------------------------- -999 for the parameter is given for parameters that have not been measured yet or are currently not available for questions concerning these catalogs please email griffith.rl@gmail.com Parameters Type Description 1 OBJNO LONG Unique object number, dependent on the survey 2 SURVEY_ID LONG The unique survey ID, if available 3 RA DOUBLE Right Ascenion J2000 in decimal degrees 4 DEC DOUBLE Declination J2000 in decimal degress 5 NTOT_HI LONG Total number of objects simultaniously fitted 6 NTOT_LOW LONG Total number of objects simultaniously fitted 7 IMAGING STRING Imaging survey 8 SPECZ FLOAT Spectroscopic redshift, DEEP2 redshift survey (AEGIS), zCOSMOS, TKRS, E-CDFS redshifts (various sources) 9 PHOTOZ FLOAT Photometric redshift, for (EGS (DEEP2 + CHFT), GEMS + GOODS-S (COMBO-17), GOODS-N,COSMOS public photoz 10 PHOTOZ_CHI2 FLOAT reduced chi2 for photometric redshift 11 PHOTOZ_ERR FLOAT error for photometric redshift (EGS + GEMS/GOODS-S) = 1 sigma COSMOS = 3 sigma 12 ZQUALITY FLOAT the quality flag for spectroscopic redshift (see paper for full description) 13 Z_ORIGIN STRING Origin of Spectroscopic redshift 14 Z FLOAT if specz high quality then use specz else use photoz 15 MAGB FLOAT B band apperant magnitude 16 MAGB_ERR FLOAT Error is B band magnitude 17 MAGR FLOAT R band apperant magnitude 18 MAGR_ERR FLOAT Error in R band magnitude 19 MAGI FLOAT I band apperant magnitude 20 MAGI_ERR FLOAT Error in I band magnitude 21 CFHT_U FLOAT CFHT u mag 22 CFHT_U_ERR FLOAT CFHT u mag error 23 CFHT_G FLOAT CFHT g mag 24 CFHT_G_ERR FLOAT CFHT g mag error 25 CFHT_R FLOAT CFHT r mag 26 CFHT_R_ERR FLOAT CFHT r mag error 27 CFHT_I FLOAT CFHT i mag 28 CFHT_I_ERR FLOAT CFHT i mag error 29 CFHT_Z FLOAT CFHT z mag 30 CFHT_Z_ERR FLOAT CFHT z mag error 31 EBV FLOAT Extinction 32 CLASS STRING Object classification, provided by DEEP2 survey and COMBO-17 survey 33 MU_HI FLOAT Surface Brightness = Mag_Best_Hi + +2.5*(alog10(2*(ba_galfit_hi)*!pi*(re_galfit_hi*0.03)^2)) 34 MU_LOW FLOAT Surface Brightness = Mag_Best_Hi + +2.5*(alog10(2*(ba_galfit_hi)*!pi*(re_galfit_hi*0.03)^2)) 35 THETA_IMAGE_HI DOUBLE Theta image (Sextractor) 36 THETA_IMAGE_LOW DOUBLE Theta image (Sextractor) 37 THETA_WORLD_HI DOUBLE Theta world (Sextractor) 38 THETA_WORLD_LOW DOUBLE Theta world (Sextractor) 39 BA_HI FLOAT Axis ratio b/a (Sextractor) 40 BA_LOW FLOAT Axis ratio b/a (Sextractor) 41 KRON_RADIUS_HI FLOAT Kron radius (Sextractor) 42 KRON_RADIUS_LOW FLOAT Kron radius (Sextractor) 43 FWHM_HI FLOAT Full Width Half maximum (Sextractor) 44 FWHM_LOW FLOAT Full Width Half maximum (Sextractor) 45 A_IMAGE_HI FLOAT A axis (Sextractor) 46 A_IMAGE_LOW FLOAT A axis (Sextractor) 47 B_IMAGE_HI FLOAT B axis (Sextractor) 48 B_IMAGE_LOW FLOAT B axis (Sextractor) 49 BACKGROUND_HI FLOAT Sky background (Sextractor) 50 BACKGROUND_LOW FLOAT Sky background (Sextractor) 51 FLUX_BEST_HI FLOAT Flux best (Sextractor) 52 FLUX_BEST_LOW FLOAT Flux best (Sextractor) 53 FLUXERR_BEST_HI FLOAT Error in flux best (Sextractor) 54 FLUXERR_BEST_LOW FLOAT Error in flux best (Sextractor) 55 MAG_BEST_HI FLOAT Mag best (Sextractor) 56 MAG_BEST_LOW FLOAT Mag best (Sextractor) 57 MAGERR_BEST_HI FLOAT Error in mag best (Sextractor) 58 MAGERR_BEST_LOW FLOAT Error in mag best (Sextractor) 59 FLUX_RADIUS_HI FLOAT Flux radius (Sextractor) 60 FLUX_RADIUS_LOW FLOAT Flux radius (Sextractor) 61 ISOAREA_IMAGE_HI FLOAT Iso area of object (Sextractor) 62 ISOAREA_IMAGE_LOW FLOAT Iso area of object (Sextractor) 63 SEX_FLAGS_HI LONG Sextractor flag 64 SEX_FLAGS_LOW LONG Sextractor flag 65 FLAG_GALFIT_HI LONG Flag galfit good=0 bad=1 66 FLAG_GALFIT_LOW LONG Flag galfit good=0 bad=1 67 CHI2NU_HI FLOAT Galfit reduced chi2 68 CHI2NU_LOW FLOAT Galfit reduced chi2 69 CLASS_STAR_HI FLOAT Class star (Sextractor) 70 CLASS_STAR_LOW FLOAT Class star (Sextractor) 71 X_GALFIT_HI FLOAT X center for GALFIT residual image 72 X_GALFIT_LOW FLOAT X center for GALFIT residual image 73 Y_GALFIT_HI FLOAT Y center for GALFIT residual image 74 Y_GALFIT_LOW FLOAT Y center for GALFIT residual image 75 MAG_GALFIT_HI FLOAT Mag (Galfit) 76 MAG_GALFIT_LOW FLOAT Mag (Galfit) 77 RE_GALFIT_HI FLOAT Effective half-light radius (Galfit) in pixels pixels scale = (0.03"/pixels, all except) COSMOS (0.05"/pixel) 78 RE_GALFIT_LOW FLOAT Effective half-light radius (Galfit) in pixels pixels scale = (0.03"/pixels, all except) COSMOS (0.05"/pixel) 79 N_GALFIT_HI FLOAT Sersic index [n $<$ 1.5 (Late type) n $>$ 2.5 (Early type)] (Galfit) 80 N_GALFIT_LOW FLOAT Sersic index [n $<$ 1.5 (Late type) n $>$ 2.5 (Early type)] (Galfit) 81 BA_GALFIT_HI FLOAT Axis ratio (Galfit) 82 BA_GALFIT_LOW FLOAT Axis ratio (Galfit) 83 PA_GALFIT_HI FLOAT Position angle (Galfit) 84 PA_GALFIT_LOW FLOAT Position angle (Galfit) 85 SKY_GALFIT_HI FLOAT Sky background measured by the GALAPAGOS code 86 SKY_GALFIT_LOW FLOAT Sky background measured by the GALAPAGOS code 87 MAGERR_GALFIT_HI FLOAT Error in mag (Galfit) 88 MAGERR_GALFIT_LOW FLOAT Error in mag (Galfit) 89 REERR_GALFIT_HI FLOAT Error in half-light radius (Galfit) 90 REERR_GALFIT_LOW FLOAT Error in half-light radius (Galfit) 91 NERR_GALFIT_HI FLOAT Error in sersic index (Galfit) 92 NERR_GALFIT_LOW FLOAT Error in sersic index (Galfit) 93 BAERR_GALFIT_HI FLOAT Error in axis ratio (Galfit) 94 BAERR_GALFIT_LOW FLOAT Error in axis ratio (Galfit) 95 PAERR_GALFIT_HI FLOAT Error in position angle (Galfit) 96 PAERR_GALFIT_LOW FLOAT Error in position angle (Galfit) 97 VIS_MORPH STRING Visual morphology classification (currently not available) hopefull provided by Galaxy Zoo