J/MNRAS/393/1531 BUDDA structural properties of galaxies (Gadotti+, 2009)
Structural properties of pseudo-bulges, classical bulges and elliptical
galaxies: a Sloan Digital Sky Survey perspective.
Gadotti D.A.
<Mon. Not. R. Astron. Soc., 393, 1531-1552 (2009)>
=2009MNRAS.393.1531G 2009MNRAS.393.1531G
ADC_Keywords: Galaxy catalogs ; Morphology ; Photometry, SDSS
Keywords: galaxies: bulges - galaxies: evolution - galaxies: formation -
galaxies: fundamental parameters - galaxies: photometry -
galaxies: structure
Abstract:
We have performed 2D bulge/bar/disc decompositions using g, r and
i-band images of a representative sample of nearly 1000 galaxies from
the Sloan Digital Sky Survey. We show that the Petrosian concentration
index is a better proxy for the bulge-to-total ratio than the global
Sersic index. We show that pseudo-bulges can be distinguished from
classical bulges as outliers in the Kormendy relation. We provide
the structural parameters and distributions of stellar masses of
ellipticals, classical bulges, pseudo-bulges, discs and bars, and find
that 32% of the total stellar mass in massive galaxies in the local
universe is contained in ellipticals, 36% in discs, 25% in classical
bulges, 3% in pseudo-bulges and 4% in bars.
Description:
BUDDA on SDSS : Bulge/Disk/Bar Image Decomposition of
∼1000 galaxies @ z∼0.05 in g, r and i.
The tables with the structural parameters resulting from the fits are
separated in three groups. The first group gives the parameters as
obtained directly from the fits in each band. The second group
provides colors obtained from fits in different bands for each galaxy
component, and in the third group one finds integrated colors and
magnitudes for each component. Also provided is a table with the
stellar mass-to-light ratio and mass of each component, as well as the
lists of galaxies classified as ellipticals, disk galaxies with
classical bulges, disk galaxies with pseudo-bulges, barred and
unbarred galaxies, and bulgeless galaxies. A description of the
columns in each table is also given below. Surface brightness is given
in magnitudes per square arcsecond, scale lengths in kpc
(H_0=75km/s/Mpc), colors in magnitudes, and masses in solar units.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 107 946 Structural parameters of bulges, discs and bars
in our sample from i-band image fits
table2.dat 116 946 Absolute magnitudes and integrated colours of
bulges, discs and bars in our sample from the
BUDDA models
list.dat 41 946 List of galaxies with morphological types
budda_g.dat 192 946 Main parameters in g band
budda_i.dat 192 946 Main parameters in i band
budda_r.dat 198 946 Main parameters in r band
gicol.dat 122 946 *g-i colors of components
ricol.dat 122 946 *r-i colors of components
totmag.dat 134 946 *Integrated quantities
masses.dat 139 946 Stellar mass-to-light ratios and masses
--------------------------------------------------------------------------------
Note on gicol.dat, ricol.dat: Colors taken directly from the fits need, in
principle, to be corrected from the fact that the effective radius of
the bulge, or the bar, in one band, might be slightly different in
the other band, due to color gradients. However, this difference is
usually very small and within seeing effects. We present colors
corrected from this effect, as well as extrapolated colors to some
defined position (one scale length in case of the disk, and the galaxy
center in case of the bulge and the bar). These quantities, however,
have significantly larger uncertainties than the colors obtained
directly from the fits (in particular those of bulge and bar
extrapolated to the center) because they depend on other structural
parameters, which carry their own uncertainties.
Note on totmag.dat: Total absolute magnitudes and colors are obtained
directly from the model images, with no extrapolation to infinity.
This means, e.g. that the bulge total magnitude and color are
calculated within the galaxy images, which are produced in order to
contain enough sky background around the galaxy.
Note to masses.dat: The i-band stellar mass-to-light ratios are derived
from the integrated g-i colors of each component and the relation
found in Kauffmann et al. (2007ApJS..173..357K 2007ApJS..173..357K - their Fig. 15). The
stellar masses are derived using these mass-to-light ratios and the
i-band integrated luminosities of each component.
--------------------------------------------------------------------------------
See also:
http://www.sdss.org : SDSS Home Page
http://www.sc.eso.org/~dgadotti/budda.html : BUDDA Home Page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.3 mag/arcsec2 mu0 ?=0.0 Disc central surface brightness
8- 12 F5.3 kpc h ?=0.0 Disk scalelength
14- 19 F6.3 mag/arcsec2 mue ?=0.0 Bulge effective surface brightness
21- 25 F5.3 kpc re ?=0.0 Bulge effective radius
27- 31 F5.3 --- n Bulge Sersic index
33- 38 F6.3 mag/arcsec2 Bmue ?=0.0 Bar effective surface brightness
40- 44 F5.3 kpc Bre ?=0.0 Bar effective radius
46- 50 F5.3 --- Bell Bar ellipticity
52- 56 F5.3 --- Bn ?=0.0 Bar Sersic index
58- 63 F6.3 arcsec Bamaj ?=0.0 Bar semimajor axis
65- 69 F5.3 --- c ?=0.0 Bar boxyness
71- 75 F5.3 --- Blg/T Bulge-to-total luminosity ratio
77- 81 F5.3 --- D/T Disc-to-total luminosity ratio
83- 87 F5.3 --- Bar/T Bar-to-total luminosity ratio
89- 94 F6.3 --- chi2 chi2 value of the fit
97-101 F5.3 arcsec Seeing Seeing HWHM of the observation
103-107 F5.3 --- z Galaxy redshift
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.3 mag gMAGd Disc absolute magnitude in the g band
9- 15 F7.3 mag rMAGd Disc absolute magnitude in the r band
17- 23 F7.3 mag iMAGd Disc absolute magnitude in the i band
25- 31 F7.3 mag gMAGbu Bulge absolute magnitude in the g band
33- 39 F7.3 mag rMAGbu Bulge absolute magnitude in the r band
41- 47 F7.3 mag iMAGbu Bulge absolute magnitude in the i band
49- 55 F7.3 mag gMAGba Bar absolute magnitude in the g band
57- 63 F7.3 mag rMAGba Bar absolute magnitude in the r band
66- 72 F7.3 mag iMAGba Bar absolute magnitude in the i band
74- 78 F5.3 mag (g-i)d Disc integrated (g-i) colour index
80- 86 F7.4 mag (r-i)d Disc integrated (r-i) colour index
88- 94 F7.3 mag (g-i)bu Bulge integrated (g-i) colour index
96-101 F6.3 mag (r-i)bu Bulge integrated (r-i) colour index
103-108 F6.3 mag (g-i)ba Bar integrated (g-i) colour index
110-116 F7.4 mag (r-i)ba Bar integrated (r-i) colour index
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Plate SDSS plate number
6- 10 I5 --- MJD SDSS MJD number
12- 14 I3 --- Fiber SDSS fiber number
16- 27 A12 --- MType Morphological type of galaxy (1)
30- 41 A12 --- MType2 Second morphological type of galaxy (1)
--------------------------------------------------------------------------------
Note (1): Morphological types determined as follows:
elliptical = Elliptical galaxies are those which do not show signs of a
stellar disk component in the image, isophotal contours and
the surface brightness radial profile
classical = Disk galaxies with classical and pseudo-bulges are separated
using the Kormendy relation.
pseudo-bulge = Disk galaxies with classical and pseudo-bulges are separated
using the Kormendy relation. Pseudo-bulges are outliers in
the paper (Fig. 8).
bulgeless = Bulgeless galaxies are those which do not seem to have a
photometric bulge, i.e. a significant central excess above
the disk surface brightness profile
barred = Bars were identified whenever there was a typical signature
in either the image, isophotal contours or the surface
brightness radial profile
unbarred = Unbarred galaxies here might still host bars with semi-major
axis below 2-3kpc, which are unlikely to be identified given
the relatively low spatial resolution of the SDSS images
--------------------------------------------------------------------------------
Byte-by-byte Description of file: budda_g.dat budda_i.dat budda_r.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Plate SDSS Plate number
6- 10 I5 --- MJD SDSS MJD number
12- 14 I3 --- Fiber SDSS Fiber number
16- 21 F6.3 mag/arcsec2 mu0 ?=0.0 Disc central surface brightness
23- 27 F5.3 mag/arcsec2 e_mu0 ?=0.0 rms uncertainty on mu0
29- 34 F6.3 kpc h ?=0.0 Disk scalelength
36- 40 F5.3 kpc e_h ?=0.0 rms uncertainty on h
42- 47 F6.3 mag/arcsec2 mue ?=0.0 Bulge effective surface brightness
49- 53 F5.3 mag/arcsec2 e_mue ?=0.0 rms uncertainty on mue
55- 59 F5.3 kpc re ?=0.0 Bulge effective radius
61- 65 F5.3 kpc e_re ?=0.0 rms uncertainty on re
67- 71 F5.3 --- n Bulge Sersic index
73- 77 F5.3 --- e_n rms uncertainty on n
79- 84 F6.3 mag/arcsec2 Bmue ?=0.0 Bar effective surface brightness
86- 90 F5.3 mag/arcsec2 e_Bmue ?=0.0 rms uncertainty on Bmue
92- 97 F6.3 kpc Bre ?=0.0 Bar effective radius
99-103 F5.3 kpc e_Bre ?=0.0 rms uncertainty on Bre
105-109 F5.3 --- Bell ?=0.0 Bar ellipticity
111-115 F5.3 --- e_Bell ?=0.0 rms uncertainty on Bell
117-121 F5.3 --- Bn ?=0.0 Bar Sersic index
123-127 F5.3 --- e_Bn ?=0.0 rms uncertainty on Bn
129-134 F6.3 arcsec Bamaj ?=0.0 Bar semimajor axis
136-141 F6.3 arcsec e_Bamaj ?=0.0 rms uncertainty on Bamaj
143-147 F5.3 --- c ?=0.0 Bar boxyness
149-154 F6.3 --- e_c ?=0.0 rms uncertainty on c
156-160 F5.3 --- Blg/T Bulge-to-total luminosity ratio
162-166 F5.3 --- D/T Disc-to-total luminosity ratio
168-172 F5.3 --- Bar/T Bar-to-total luminosity ratio
174-179 F6.3 --- chi2 chi2 value of the fit
181-185 F5.3 arcsec Seeing Seeing HWHM of the observation
187-191 F5.3 --- z Galaxy redshift
193-198 F6.3 --- --- ? Unexplained parameter, only in r band
--------------------------------------------------------------------------------
Byte-by-byte Description of file: gicol.dat ricol.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Plate SDSS plate number
6- 10 I5 --- MJD SDSS MJD number
12- 14 I3 --- Fiber SDSS fiber number
16- 21 F6.3 mag dccol Central color of the disk taken directly
from the fit
23- 27 F5.3 mag e_dccol rms uncertainty on ccol
29- 34 F6.3 mag edcol Extrapolated color of the disk at one scale
length
36- 40 F5.3 mag e_edcol rms uncertainty on ecol
42- 48 F7.3 mag bucol Color of the bulge at one effective radius
taken directly from the fit
50- 54 F5.3 mag e_bucol rms uncertainty on bucol
56- 61 F6.3 mag bucolc Corrected color of the bulge at one effective
radius
63- 68 F6.3 mag e_bucolc rms uncertainty on bucolc
70- 76 F7.3 mag buecol Extrapolated central color of the bulge
78- 82 F5.3 mag e_buecol rms uncertainty on buecol
84- 89 F6.3 mag bacol Color of the bar at one effective radius
taken directly from the fit
91- 95 F5.3 mag e_bacol rms uncertainty on bacol
97-102 F6.3 mag bacolc Corrected color of the bar at one effective
radius
104-109 F6.3 mag e_bacolc ?=99.999 rms uncertainty on bacolc
111-116 F6.3 mag baecol Extrapolated central color of the bar
118-122 F5.3 mag e_baecol rms uncertainty on baecol
--------------------------------------------------------------------------------
Byte-by-byte Description of file: totmag.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Plate SDSS plate number
6- 10 I5 --- MJD SDSS MJD number
12- 14 I3 --- Fiber SDSS fiber number
16- 22 F7.3 mag gMAGd ?=0.000 Disk absolute total g-band magnitude
24- 30 F7.3 mag rMAGd ?=0.000 Disk absolute total r-band magnitude
32- 38 F7.3 mag iMAGd ?=0.000 Disk absolute total i-band magnitude
40- 46 F7.3 mag gMAGbu ?=0.000 Bulge absolute total g-band magnitude
48- 54 F7.3 mag rMAGbu ?=0.000 Bulge absolute total r-band magnitude
56- 62 F7.3 mag iMAGbu ?=0.000 Bulge absolute total i-band magnitude
64- 70 F7.3 mag gMAGba ?=0.000 Bar absolute total g-band magnitude
72- 78 F7.3 mag rMAGba ?=0.000 Bar absolute total r-band magnitude
80- 86 F7.3 mag iMAGba ?=0.000 Bar absolute total i-band magnitude
90- 94 F5.3 mag (g-i)d ?=0.000 Disk g-i total color index
97-102 F6.3 mag (r-i)d ?=0.000 Disk r-i total color index
104-110 F7.3 mag (g-i)bu ?=0.000 Bulge g-i total color index
113-118 F6.3 mag (r-i)bu ?=0.000 Bulge r-i total color index
121-126 F6.3 mag (g-i)ba ?=0.000 Bar g-i total color index
129-134 F6.3 mag (r-i)ba ?=0.000 Bar r-i total color index
--------------------------------------------------------------------------------
Byte-by-byte Description of file: masses.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Plate SDSS plate number
6- 10 I5 --- MJD SDSS MJD number
12- 14 I3 --- Fiber SDSS fiber number
16- 38 E23.17 --- M/Lbu ?=0. Mass-to-light ratio of the bulge
41- 53 F13.11 --- M/Ld ?=0. Mass-to-light ratio of the disk
55- 69 F15.11 --- M/Lba ?=0. Mass-to-light ratio of the bar
72- 93 E22.17 solMass Mblg ?=0. Bulge mass
95-116 E22.17 solMass Mdisk ?=0. Disk mass
118-139 E22.17 solMass Mbar ?=0. Bar mass
--------------------------------------------------------------------------------
History:
From electronic version of the journal and
http://www.sc.eso.org/~dgadotti/buddaonsdss/buddaonsdss.html
(End) Patricia Vannier [CDS] 19-Jul-2010