J/MNRAS/494/2090 Group galaxies in ALFALFA survey (Jones+, 2020)
The HI mass function of group galaxies in the ALFALFA survey.
Jones M., Hess K.M., Adams E.A.K., Verdes-Montenegro L.
<Mon. Not. R. Astron. Soc. 494, 2090 (2020)>
=2020MNRAS.494.2090J 2020MNRAS.494.2090J (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; H I data
Keywords: galaxies: groups: general - galaxies: luminosity function -
mass function - radio lines: galaxies
Abstract:
We estimate the HI mass function (HIMF) of galaxies in groups based on
thousands of ALFALFA (Arecibo Legacy Fast ALFA survey) HI detections
within the galaxy groups of four widely used SDSS (Sloan Digital Sky
Survey) groups catalogues. Although differences between the catalogues
mean that there is no one definitive group galaxy HIMF, in general we
find that the low-mass slope is flat, in agreement with studies based
on small samples of individual groups, and that the 'knee' mass is
slightly higher than that of the global HIMF of the full ALFALFA
sample. We find that the observed fraction of ALFALFA galaxies in
groups is approximately 22 per cent. These group galaxies were removed
from the full ALFALFA source catalogue to calculate the field HIMF
using the remaining galaxies. Comparison between the field and group
HIMFs reveals that group galaxies make only a small contribution to
the global HIMF as most ALFALFA galaxies are in the field, but beyond
the HIMF 'knee' group galaxies dominate. Finally we attempt to
separate the group galaxy HIMF into bins of group halo mass, but find
that too few low-mass galaxies are detected in the most massive groups
to tightly constrain the slope, owing to the rarity of such groups in
the nearby Universe where low-mass galaxies are detectable with
existing HI surveys.
Description:
These four tables list the ALFALFA galaxies (by AGC number) from
Haynes et al. 2018 (J/ApJ/861/49) which were matched to the four
optical galaxy groups catalogues used in this work: Berlind et al.
2009 (http://lss.phy.vanderbilt.edu/groups/dr7/), Tempel et al. 2014
(J/A+A/566/A1/v180_gr), Yang et al. 2012
(https://gax.sjtu.edu.cn/data/Group.html), and Lim et al. 2017
(https://gax.sjtu.edu.cn/data/Group.html). The tables also include the
groups within the survey volume considered by do not contain any
galaxies detected in ALFALFA.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
berlind.dat 34 2792 ALFALFA galaxies in Berlind et al. 2009 groups
tempel.dat 34 5885 ALFALFA galaxies in Tempel et al. 2014 groups
yang.dat 34 3292 ALFALFA galaxies in Yang et al. 2012 groups
lim.dat 34 4358 ALFALFA galaxies in Lim et al. 2017 groups
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See also:
J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)
J/A+A/566/A1 : Flux- and volume-limited groups for SDSS galaxies (Tempel+ 2014)
https://gax.sjtu.edu.cn/data/Group.html :
Group Catalogues for 2dFGRS & SDSS SDSS_DR7 Home Page
http://lss.phy.vanderbilt.edu/groups/dr7 :
Groups and Clusters in the SDSS Home Page
Byte-by-byte Description of file: berlind.dat lim.dat tempel.dat yang.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- AGC ? ID number corresponding to the
ALFALFA 100% release (J/ApJ/861/49)
8- 12 I5 --- GN Group ID number (1)
14- 18 F5.1 Mpc dist Hubble distance of group (h=0.7)
20- 24 F5.2 [Msun] log(MHI) ? log(HI mass) of galaxy assuming distance
above
26- 30 F5.1 km/s W50 ? Observed velocity width at 50% of peak on
either side (J/ApJ/861/49)
32 I1 --- comp [0/1]? Flag indicating if above the ALFALFA
completeness limit
34 I1 --- prox [0/1]? Flag indicating if the ALFALFA galaxy
was matched to the group only by a
proximity match
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Note (1): Group ID number from:
berlind.dat : Berlind et al., 2009 Mr18 catalogue
(http://lss.phy.vanderbilt.edu/groups/dr7/)
tempel.dat : Tempel et al., 2014 catalogue (J/A+A/566/A1/v180_gr)
yang.dat : Yang et al., 2012 SDSS DR7 model B catalogue
(https://gax.sjtu.edu.cn/data/Group.html)
https://gax.sjtu.edu.cn/data/data1/Group_SDSS7/group_DR7.tar.gz
lim_.dat : Lim et al., 2017 SDSS+M group catalogue
(https://gax.sjtu.edu.cn/data/Group.html)
https://gax.sjtu.edu.cn/data/data1/Group_LowZ/catalogs.tgz
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Acknowledgements:
Michael Jones, mjones(at)iaa.es
(End) Patricia Vannier [CDS] 12-Mar-2020