J/ApJ/862/48 Galaxy groups from SDSS DR7 and ALFALFA (Mei+, 2018)
Evolution of galaxy types and HI gas contents in galaxy groups.
Mei A., Ming Z.
<Astrophys. J., 862, 48-48 (2018)>
=2018ApJ...862...48M 2018ApJ...862...48M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, group; H I data; Redshifts; Optical; Surveys
Keywords: galaxies: evolution; galaxies: groups: general
Abstract:
Using the group crossing time tc as an age indicator for galaxy
groups, we have investigated the correlation between tc and the
group spiral fraction, as well as between tc and the neutral
hydrogen gas fraction of galaxy groups. Our galaxy group sample is
selected from the SDSS DR7 catalog, and the group spiral fraction is
derived from the Galaxy Zoo morphological data set. We found that the
group spiral galaxy fraction is correlated with the group crossing
time. We further cross-matched the latest released ALFALFA 70% H I
source catalog with the SDSS group catalog and have identified 172
groups from the SDSS survey whose total H I mass can be derived by
summing up the H I mass of all the H I sources within the group
radius. For the galaxies not detected in ALFALFA, we estimate their H
I masses based on the galaxies' optical colors and magnitudes. Our
sample groups contain more than eight member galaxies, they cover a
wide range of halo masses and are distributed in different cosmic
environments. We derived the group H I mass fraction, which is the
ratio of group H I mass to the group virial mass. We found a
correlation between the H I mass fraction and the group crossing time.
Our results suggest that long timescale mechanisms such as starvation
seem to play a more important role than short timescale processes like
stripping in depleting H I gas in the SDSS galaxy groups.
Description:
Our sample was selected from the SDSS DR7 Mr18 group catalog. This
catalog is based on an optimized algorithm of the friends of friends
(FoF) method, which is described in detail in
Berlind+ (2006, J/ApJS/167/1).
The complete group catalogs derived from SDSS DR7 are available online
(http://lss.phy.vanderbilt.edu/groups/dr7/).
By cross-matching the latest released ALFALFA 70% HI source catalog
with the SDSS group catalog, we have identified 172 groups from the
SDSS survey whose total HI mass can be derived.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 73 172 The resulting values for the SDSS sample
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See also:
VII/174 : Morphological type cat. in 55 rich galaxy clusters (Dressler, 1980)
VII/85 : Hickson Compact Groups of Galaxies (Hickson 1982)
VII/213 : Hickson's Compact groups of Galaxies (Hickson+ 1982-1994)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/ApJ/399/353 : Radial velocities in Hickson compact groups (Hickson+ 1992)
J/ApJS/167/1 : Galaxy groups and clusters from SDSS (Berlind+, 2006)
J/MNRAS/400/1962 : Southern GEMS groups. II. (Kilborn+, 2009)
J/MNRAS/410/166 : Morphological types from Galaxy Zoo 1 (Lintott+, 2011)
J/MNRAS/416/1680 : ATLAS3D project. VII. (Cappellari+, 2011)
J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)
J/AJ/142/170 : ALFALFA survey: α.40 HI source catalog (Haynes+, 2011)
J/MNRAS/423/787 : AGES sources in Virgo cluster (Taylor+, 2012)
J/ApJ/768/74 : PHIBSS: CO obs. of star-forming galaxies (Tacconi+, 2013)
J/MNRAS/436/34 : GALEX Arecibo SDSS survey. Final DR (Catinella+, 2013)
J/ApJ/832/126 : RESOLVE survey: 21cm obs. with GBT & Arecibo (Stark+, 2016)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- GroupID [6/22080] Group ID
7- 16 F10.6 deg RAdeg [3/352] Right ascension (J2000)
18- 26 F9.6 deg DEdeg [-0.03/31] Declination (J2000)
28- 34 F7.5 --- z [0.02/0.042] Redshift of the group
36- 37 I2 --- Nm [8/79] Number of member galaxies
39- 40 I2 --- Nspir [2/35] Number of spiral galaxies
42- 43 I2 --- NHI [1/20] Number of galaxies detected by HI
45- 49 F5.2 10+10Msun MHI [0.14/11.3] Group HI mass detected by ALFALFA
51- 55 F5.2 10+13Msun Mvir [0.81/30.6] Group virial mass
57- 61 F5.3 --- tcH0 [0.027/0.32] Crossing time
63- 67 F5.2 10+9Msun MHIc [0.4/56.6] Group HI mass of the HI-undetected
member galaxies estimated based on optical
color
69- 73 F5.2 10+8Msun e_MHI [0.86/66.2] The error of the detected HI mass
of the SDSS groups
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 29-Sep-2023