J/MNRAS/489/2216 Stellar disc scale lengths in rich environments (Demers+, 2019)
Smaller stellar disc scale lengths in rich environments.
Demers M.L., Parker L.C., Roberts I.D.
<Mon. Not. R. Astron. Soc., 489, 2216-2226 (2019)>
=2019MNRAS.489.2216D 2019MNRAS.489.2216D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; X-ray sources ; Positional data ; Optical
Keywords: galaxies: clusters: general - galaxies: formation -
galaxies: groups: general - galaxies: structure
Abstract:
We investigate the dependence of stellar disc scale lengths on
environment for a sample of Sloan Digital Sky Survey Data Release 7
galaxies with published photometric bulge-disc decompositions. We
compare disc scale lengths at fixed bulge mass for galaxies in an
isolated field environment to galaxies in X-ray rich and X-ray poor
groups. At low bulge mass, stellar disc scale lengths in X-ray rich
groups are smaller compared to discs in both X-ray poor groups and in
isolated field environments. This decrease in disc scale length is
largely independent of halo mass, though shows some dependence on
group-centric distance. We also find that stellar disc scale lengths
are smaller in X-ray rich environments for a subset of star-forming
galaxies and for galaxies of different morphological types. We note
that disc scale lengths of low mass galaxies are known to have large
systematic uncertainties, however we focus on differences between
samples with the same measurement biases. Our results show that
stellar disc scale lengths depend on X-ray brightness, a tracer of IGM
density, suggesting a role for hydrodynamic processes such as
ram-pressure stripping and/or starvation.
Description:
To examine the dependencies of galaxy discs on environment, we make
use of a wealth of data from several public catalogues consisting of
Sloan Digital Sky Survey Data Release 7 (SDSS-DR7; Abazajian et al.
2009ApJS..182..543A 2009ApJS..182..543A) galaxies and groups.
We use a large sample of groups identified in SDSS-DR7 by Yang et al.
(2007ApJ...671..153Y 2007ApJ...671..153Y), hereafter Y07. The group finder developed by
Yang et al. (2005MNRAS.356.1293Y 2005MNRAS.356.1293Y, 2007ApJ...671..153Y 2007ApJ...671..153Y) applies a
modified friends-of-friends (FOF) algorithm to the sample, and assigns
galaxies to tentative groups based on short linking lengths in
redshift space.
We use group X-ray luminosities determined by Wang et al.
(2014MNRAS.439..611W 2014MNRAS.439..611W, Cat. J/MNRAS/439/611), who estimated the X-ray
luminosities for 65000 optically selected galaxy groups (and clusters)
in the SDSS using X-ray data from the ROSAT All Sky Survey (RASS;
Voges et al. 1999A&A...349..389V 1999A&A...349..389V, Cat. IX/10A).
We use bulge and disc decompositions of SDSS galaxies from Simard
et al. (2011ApJS..196...11S 2011ApJS..196...11S, Cat. J/ApJS/196/11), hereafter S11. S11
uses the GIM2D software package to fit the two-dimensional surface
brightness profiles of SDSS galaxies in the g and r bandpasses.
We obtain the total stellar, bulge, and disc masses from Mendel et al.
(2014ApJS..210....3M 2014ApJS..210....3M, Cat. J/ApJS/210/3).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 364 13160 Sample data for galaxies from the XRS group
sample
table2.dat 363 13584 Sample data for galaxies from the XRW group
sample
table3.dat 267 46647 Sample of galaxies from the isolated field
catalogue
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See also:
II/294 : The SDSS Photometric Catalog, Release 7
(Adelman-McCarthy+, 2009)
J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011)
J/MNRAS/439/611 : X-ray luminosities of SDSS DR7 clusters from RASS
(Wang+, 2014)
J/ApJS/210/3 : SDSS bulge, disk and total stellar mass estimates
(Mendel+, 2014)
Byte-by-byte Description of file: table1.dat table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 I18 --- ID SDSS object identifier
20- 41 F22.18 deg RAdeg Right ascension (J2000)
43- 65 F23.19 deg DEdeg Declination (J2000)
67- 86 F20.18 --- z Redshift
88-105 F18.15 [Msun] logMstar Logarithm of stellar mass (G1)
107-126 F20.16 [Msun] logMbulge Logarithm of bulge mass (G1)
128-147 F20.16 [Msun] logMdisk Logarithm of disk mass (G1)
149-167 F19.17 kpc/arcsec Scale Physical scale at redshift z (G2)
169-172 F4.2 --- BTr r-band bulge fraction
174-176 F3.1 --- nb Sersic index (G2)
178-182 F5.2 kpc Rd Exponential disk scale length (G2)
184-188 F5.2 kpc Re Bulge semimajor effective radius (G2)
190-210 F21.16 Mpc3 Vmax Galaxy volume correction (G2)
212-232 E21.19 --- PpS F-test probability that a B+D model is not
required compared to a pure Sersic
model (G2)
234-251 F18.15 [Msun] logMhalo Logarithm of halo mass (G3)
253-270 F18.15 10+37W Lx Group X-ray luminosity from Wang et al.
(2014MNRAS.439..611W 2014MNRAS.439..611W, J/MNRAS/439/611)
272-277 I6 --- Group Group identifier (G3)
279-298 F20.18 --- zg Redshift of the luminosity-weighted group
centre (G3)
300-322 E23.20 [Msun/yr] logSFR Logarithm of star formation rate from
Brinchmann et al. (2004MNRAS.351.1151B 2004MNRAS.351.1151B)
324-341 F18.16 Mpc R200 Group viral radius (1)
343-364 E22.20 --- R/R200 Group-centric radius
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Note (1): The group's virial radius R200, calculated in Tinker & Chen
(2008ApJ...679.1218T 2008ApJ...679.1218T) is defined as:
R200=[3Mhalo/(4πx200ρm)]1/3 (see equation 1), where
ρm is the average background matter density of the Universe
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 I18 --- ID SDSS object identifier
20- 41 F22.18 deg RAdeg Right ascension (J2000)
43- 65 E23.19 deg DEdeg Declination (J2000)
67- 86 F20.18 --- z Redshift
88-106 F19.16 [Msun] logMstar Logarithm of stellar mass (G1)
108-127 F20.16 [Msun] logMbulge Logarithm of bulge mass (G1)
129-148 F20.16 [Msun] logMdisk Logarithm of disk mass (G1)
150-168 F19.17 kpc/arcsec Scale Physical scale at redshift z (G2)
170-173 F4.2 --- BTr r-band bulge fraction
175-177 F3.1 --- nb Sersic index (G2)
179-183 F5.2 kpc Rd Exponential disk scale length (G2)
185-189 F5.2 kpc Re Bulge semimajor effective radius (G2)
191-213 F23.18 Mpc3 Vmax Galaxy volume correction (G2)
215-235 E21.19 --- PpS F-test probability that a B+D model is not
required compared to a pure Sersic
model (G2)
237-243 I7 --- Group Group identifier (G3)
245-267 E23.20 [Msun/yr] logSFR Logarithm of star formation rate from
Brinchmann et al. (2004MNRAS.351.1151B 2004MNRAS.351.1151B)
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Global Notes:
Note (G1): Masses from Mendel et al. (2014ApJS..210....3M 2014ApJS..210....3M, Cat. J/ApJS/210/3)
Note (G2): Parameters from Simard et al. (2011ApJS..196...11S 2011ApJS..196...11S,
Cat. J/ApJS/196/11)
Note (G3): Group parameters from Yang et al. (2007ApJ...671..153Y 2007ApJ...671..153Y)
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 11-Jan-2023