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J/ApJS/196/11     Bulge+disk decompositions of SDSS galaxies     (Simard+, 2011)

A catalog of bulge+disk decompositions and updated photometry for 1.12 million galaxies in the Sloan digital sky survey. Simard L., Trevor Mendel J., Patton D.R., Ellison S.L., McConnachie A.W. <Astrophys. J. Suppl. Ser., 196, 11 (2011)> =2011ApJS..196...11S
ADC_Keywords: Galaxies, optical ; Photometry, SDSS ; Models, evolutionary ; Surveys ; Galaxy catalogs ; Morphology Keywords: galaxies: evolution - galaxies: fundamental parameters Abstract: We perform two-dimensional, point-spread-function-convolved, bulge+disk decompositions in the g and r bandpasses on a sample of 1123718 galaxies from the Legacy area of the Sloan Digital Sky Survey Data Release Seven. Four different decomposition procedures are investigated which make improvements to sky background determinations and object deblending over the standard SDSS procedures that lead to more robust structural parameters and integrated galaxy magnitudes and colors, especially in crowded environments. We use a set of science-based quality assurance metrics, namely, the disk luminosity-size relation, the galaxy color-magnitude diagram, and the galaxy central (fiber) colors to show the robustness of our structural parameters. The best procedure utilizes simultaneous, two-bandpass decompositions. Bulge and disk photometric errors remain below 0.1mag down to bulge and disk magnitudes of g∼19 and r∼18.5. We also use and compare three different galaxy fitting models: a pure Sersic model, an nb=4 bulge+disk model, and a Sersic (free nb) bulge+disk model. The most appropriate model for a given galaxy is determined by the F-test probability. All three catalogs of measured structural parameters, rest-frame magnitudes, and colors are publicly released here. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 442 1123718 SDSS structural parameters from n=4 bulge+disk decompositions table2.dat 442 1123718 SDSS structural parameters from free nb bulge+disk decompositions table3.dat 273 1123718 SDSS structural parameters from pure Sersic decompositions
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/ApJS/173/293 : UV-Optical galaxy color-magnitude diagram I. (Wyder+, 2007) J/A+A/415/63 : UBVRI surface brightness of 26 bright galaxies (Mollenhoff, 2004) J/AJ/127/704 : Low surface brightness galaxies in SDSS (Kniazev+, 2004) J/AJ/116/1626 : Spiral and lenticular galaxy brightness profiles (Baggett+, 1998) Byte-by-byte Description of file: table[12].dat
Bytes Format Units Label Explanations
1- 18 I18 --- objID SDSS "objID" object identifier (run, rerun, camcol, field, object) 20- 29 F10.6 --- z ?=-99.99 SDSS redshift (spectroscopic if available; or photometric ("-1" in "Sp") 31- 32 I2 --- Sp [-2/6] SDSS SpecClass value (G1) 34- 40 F7.3 kpc/arcsec Scale ?=-99.99 Physical scale at redshift z 42- 51 F10.3 Mpc+3 Vmax ?=-99.99 Galaxy volume correction (Eq. 7) 53- 58 F6.2 mag gg2d ?=-99.99 GIM2D B+D model g-band magnitude; (Eq. 1) 60- 65 F6.2 mag e_gg2d ?=-99.99 Uncertainty in gg2d 67- 72 F6.2 mag rg2d ?=-99.99 GIM2D B+D model r-band magnitude; (Eq. 1) 74- 79 F6.2 mag e_rg2d ?=-99.99 Uncertainty in rg2d 81- 86 F6.2 mag gg2df ?=-99.99 B+D model g-band fiber magnitude 88- 93 F6.2 mag rg2df ?=-99.99 B+D model r-band fiber magnitude 95-100 F6.2 mag dCol [-4.60,+3.83]?=-99.99 Delta fiber color (G2) 102-107 F6.2 --- (B/T)g [0,1]?=-99.99 g-band bulge fraction 109-114 F6.2 --- e_(B/T)g [0,1]?=-99.99 Uncertainty in (B/T)g 116-121 F6.2 --- (B/T)r [0,1]?=-99.99 r-band bulge fraction 123-128 F6.2 --- e_(B/T)r [0,1]?=-99.99 Uncertainty in (B/T)r 130-135 F6.2 --- (B/T)gf ?=-99.99 g-band fiber bulge fraction 137-142 F6.2 --- (B/T)rf ?=-99.99 r-band fiber bulge fraction 144-150 F7.2 kpc Rhlg [0,1488]?=-99.99 g-band galaxy semi-major axis, half-light radius 152-158 F7.2 kpc Rhlr [0,1488]?=-99.99 r-band galaxy semi-major axis, half-light radius 160-166 F7.2 kpc Rchl,g [-336,308] g-band galaxy circular half-light radius 168-174 F7.2 kpc Rchl,r [-336,287] r-band galaxy circular half-light radius 176-181 F6.2 kpc Re ?=-99.99 Bulge semi-major effective radius 183-188 F6.2 kpc e_Re ?=-99.99 Uncertainty in Re 190-195 F6.2 --- e [0,1]?=-99.99 Bulge ellipticity (G3) 197-202 F6.2 --- e_e [0,1]?=-99.99 Uncertainty in e 204-210 F7.2 deg phib [-360,360] Bulge position angle (G4) 212-217 F6.2 deg e_phib ?=-99.99 Uncertainty in phib 219-224 F6.2 kpc Rd ?=-99.99 Exponential disk scale length 226-231 F6.2 kpc e_Rd ?=-99.99 Uncertainty in Rd 233-238 F6.2 deg i ?=-99.99 Disk inclination angle (1) 240-245 F6.2 deg e_i ?=-99.99 Uncertainty in i 247-253 F7.2 deg phid [-360,360] Disk position angle (G4) 255-260 F6.2 deg e_phid ?=-99.99 Uncertainty in phid 262-267 F6.2 arcsec (dx)g ?=-99.99 g-band B+D model center X offset (G5) 269-274 F6.2 arcsec e_(dx)g ?=-99.99 Uncertainty in (dx)g 276-281 F6.2 arcsec (dy)g ?=-99.99 g-band B+D model center Y offset (G5) 283-288 F6.2 arcsec e_(dy)g ?=-99.99 Uncertainty in (dy)g 290-295 F6.2 arcsec (dx)r ?=-99.99 r-band B+D model center X offset (G5) 297-302 F6.2 arcsec e_(dx)r ?=-99.99 Uncertainty in (dx)r 304-309 F6.2 arcsec (dy)r ?=-99.99 r-band B+D model center Y offset (G5) 311-316 F6.2 arcsec e_(dy)r ?=-99.99 Uncertainty in (dy)r 318-323 F6.2 --- S2g ?=-99.99 g-band image smoothness parameter (G6) 325-330 F6.2 --- S2r ?=-99.99 r-band image smoothness parameter (G6) 332-337 F6.2 mag ggMag ?=-99.99 Absolute, rest-frame g-band GIM2D galaxy magnitude (Eq. 3a) 339-344 F6.2 mag e_ggMag ?=-99.99 Uncertainty in ggMag 346-351 F6.2 mag gbMag ?=-99.99 Absolute, rest-frame g-band GIM2D bulge magnitude (Eq. 3c) 353-358 F6.2 mag e_gbMag ?=-99.99 Uncertainty in gbMag 360-365 F6.2 mag gdMag ?=-99.99 Absolute, rest-frame g-band GIM2D disk magnitude (Eq. 3e) 367-372 F6.2 mag e_gdMag ?=-99.99 Uncertainty in gdMag 374-379 F6.2 mag rgMag ?=-99.99 Absolute, rest-frame r-band GIM2D galaxy magnitude (Eq. 3b) 381-386 F6.2 mag e_rgMag ?=-99.99 Uncertainty in rgMag 388-393 F6.2 mag rbMag ?=-99.99 Absolute, rest-frame r-band GIM2D bulge magnitude (Eq. 3d) 395-400 F6.2 mag e_rbMag ?=-99.99 Uncertainty in rbMag 402-407 F6.2 mag rdMag ?=-99.99 Absolute, rest-frame r-band GIM2D disk magnitude (Eq. 3f) 409-414 F6.2 mag e_rdMag ?=-99.99 Uncertainty in rdMag 416-421 F6.2 --- nb [0,8]?=-99.99 Bulge Sersic index (4.00 for table 1) 423-428 F6.2 --- e_nb [0,4]?=-99.99 Uncertainty in nb (0.00 for table 1) 430-435 F6.2 --- PpS [0,1]?=-99.99 F-test probability (2) 439-442 F4.2 --- Pn4 [0,1]? F-test probability (only for table 2) (3)
Note (1): i=0 for face-on disk. Note (2): That a B+D model is not required compared to a pure Sersic model. Note (3): That a free nb B+D model is not required compared to a fixed nb=4 B+D model.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 18 I18 --- objID SDSS object identifier 20- 29 F10.6 --- z ?=-99.99 SDSS redshift (spectroscopic if available or photometric ("-1" in "Sp") 31- 32 I2 --- Sp [-2/6] SDSS SpecClass value (G1) 36- 42 F7.3 kpc/arcsec Scale ?=-99.99 Physical scale at redshift z 44- 53 F10.3 Mpc+3 Vmax ?=-99.99 Galaxy volume correction (Eq. 7) 55- 60 F6.2 mag gg2d ?=-99.99 GIM2D pure Sersic model g-band magnitude 62- 67 F6.2 mag e_gg2d ?=-99.99 Uncertainty in gg2d 69- 74 F6.2 mag rg2d ?=-99.99 GIM2D pure Sersic model r-band magnitude 76- 81 F6.2 mag e_rg2d ?=-99.99 Uncertainty in rg2d 83- 88 F6.2 mag gg2df ?=-99.99 GIM2D pure Sersic model g-band fiber magnitude 90- 95 F6.2 mag rg2df ?=-99.99 GIM2D pure Sersic model r-band fiber magnitude 97-102 F6.2 mag dCol [-4.95,+5.73]?=-99.99 Delta fiber color (G2) 104-109 F6.2 kpc Rhlg ?=-99.99 g-band galaxy semi-major axis, half-light radius 111-116 F6.2 kpc Rhlr ?=-99.99 r-band galaxy semi-major axis, half-light radius 118-124 F7.2 kpc Rchl,g [-336,284] g-band galaxy circular half-light radius 126-132 F7.2 kpc Rchl,r [-336,284] r-band galaxy circular half-light radius 134-139 F6.2 --- e ?=-99.99 Galaxy ellipticiy (G3) 141-146 F6.2 --- e_e ?=-99.99 Uncertainty in e 148-154 F7.2 deg phi [-360,360] Galaxy position angle (G4) 156-161 F6.2 deg e_phi ?=-99.99 Uncertainty in phi 163-168 F6.2 arcsec (dx)g [-42,32]?=-99.99 g-band pure Sersic model center X offset (G5) 170-175 F6.2 arcsec e_(dx)g ?=-99.99 Uncertainty in (dx)g 177-182 F6.2 arcsec (dy)g [-38,30]?=-99.99 g-band pure Sersic model center Y offset (G5) 184-189 F6.2 arcsec e_(dy)g ?=-99.99 Uncertainty in (dy)g 191-196 F6.2 arcsec (dx)r [-31,30]?=-99.99 r-band pure Sersic model center X offset (G5) 198-203 F6.2 arcsec e_(dx)r ?=-99.99 Uncertainty in (dx)r 205-210 F6.2 arcsec (dy)r [-38,30]?=-99.99 r-band pure Sersic model center Y offset (G5) 212-217 F6.2 arcsec e_(dy)r ?=-99.99 Uncertainty in (dy)r 219-224 F6.2 --- S2g [-89,98]?=-99.99 g-band image smoothness parameter (G6) 226-231 F6.2 --- S2r [-75,99]?=-99.99 r-band image smoothness parameter (G6) 233-238 F6.2 mag ggMag [-37,7]?=-99.99 Absolute, rest-frame g-band GIM2D galaxy magnitude (Eq. 3a) 240-245 F6.2 mag e_ggMag ?=-99.99 Uncertainty in ggMag 247-252 F6.2 mag rgMag [-36,6]?=-99.99 Absolute, rest-frame r-band GIM2D galaxy magnitude (Eq. 3b) 254-259 F6.2 mag e_rgMag ?=-99.99 Uncertainty in rgMag 261-266 F6.2 --- ng [0,8]?=-99.99 Galaxy Sersic index 268-273 F6.2 --- e_ng ?=-99.99 Uncertainty in ng
Global notes: Note (G1): Flags as follows: -1 = photometric; -2 = no redshift available 0 = unknown: spectrum not classifiable (zConf<0.25) 1 = star 2 = galaxy 3 = QSO 4 = high-redshift quasar, z>2.3 5 = Spectrum of blank sky. 6 = STAR_LATE: Star dominated by molecular bands M or later. Note (G2): Delta fiber color defined as: (g-r)gim2d,fiber-(g-r)SDSS,fiber. Note (G3): e=1-b/a, e=0 for a circular bulge. Note (G4): Measured clockwise from the +y axis of SDSS images. Note (G5): From Column|Row position given by colc(g|r)|rowc(g|r) on SDSS corrected image. Note (G6): As defined in Simard et al. (2009A&A...508.1141S).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Nov-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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