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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 435 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
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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
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: table3.dat
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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
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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 2009A&A...508.1141S).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Nov-2011