J/MNRAS/423/2690 Sample of Compact Group (CG) galaxies (Scudder+, 2012)
The dependence of galaxy group star formation rates and metallicities on
large-scale environment.
Scudder J.M., Ellison S.L., Mendel J.T.
<Mon. Not. R. Astron. Soc., 423, 2690-2704 (2012)>
=2012MNRAS.423.2690S 2012MNRAS.423.2690S
ADC_Keywords: Surveys ; Clusters, galaxy ; Morphology ; Redshifts ; Abundances
Keywords: galaxies: abundances - galaxies: evolution -
galaxies: groups: general - galaxies: interactions -
galaxies: star formation
Abstract:
We construct a sample of 75863 star-forming galaxies with robust
metallicity and star formation rate (SFR) measurements from the Sloan
Digital Sky Survey Data Release 7, from which we select a clean sample
of compact group (CG) galaxies. The CGs are defined to be close
configurations of at least four galaxies that are otherwise apparently
isolated. Our selection results in a sample of 112 spectroscopically
identified CG galaxies, which can be further divided into groups that
are either embedded within a larger structure, such as a cluster or
large group, or truly isolated systems. The CGs then serve as a probe
into the influence of large-scale environment on a galaxy's
evolution, while keeping the local density fixed at high values. W
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 56 50 Embedded CG galaxy properties
tablea2.dat 56 62 Isolated CG galaxy properties
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See also:
II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/MNRAS/395/255 : Compact groups of galaxies in SDSS DR6 (McConnachie+, 2009)
J/A+A/514/A102 : SDSS DR7 groups of galaxies (Tago+, 2010)
J/AJ/142/122 : SDSS DR7 galaxy/QSOs pairs (Cherinka+, 2011)
J/MNRAS/422/25 : SDSS DR7 groups, clusters and filaments (Smith+, 2012)
Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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1- 18 I18 --- objID SDSS unique identification number, objID
20- 26 A7 --- --- [SDSSCGA]
27- 33 F7.1 --- SDSSCGA Galaxy identification, NNNNN.N (1)
35- 39 F5.3 --- z Redshift
41- 45 F5.2 [Msun] logM* Stellar mass
47- 50 F4.2 [-] Met Metallicity, 12+log(O/H) (2)
52- 56 F5.2 [Msun/yr] logSFR Star formation rate (3)
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Note (1): the Galaxy ID from the McConnachie et al. (2009, Cat. J/MNRAS/395/255)
catalogue where numbers before the decimal indicate the group ID, and the
number after the decimal varies between galaxies within one group.
Note (2): Metallicity calculations are described in Section 2.3.
Note (3): SFR values come from the calculations of Brinchmann et al.
(2004MNRAS.351.1151B 2004MNRAS.351.1151B).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Apr-2013