Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/211908

Title

An HI survey of six local group analogs II: HI properties of group galaxies

Author(s)

Pisano, D. J.;  Barnes, David G.;  Staveley-Smith, Lister;  Gibson, Brad K.;  Kilborn, Virginia A.;  Freeman, Ken C.

Abstract

We have conducted an H I 21 cm emission-line survey of six loose groups of galaxies chosen to be analogs to the Local Group. The survey was conducted using the Parkes multibeam instrument and the Australia Telescope Compact Array (ATCA) over a ~1 Mpc2 area and covering the full depth of each group, with an M H I sensitivity of ~7 × 105 M ☉. Our survey detected 110 sources, 61 of which are associated with the six groups. All of these sources were confirmed with ATCA observations or were previously cataloged by HIPASS. The sources all have optical counterparts and properties consistent with dwarf irregular or late-type spiral galaxies. We present here the H I properties of the groups and their galaxies. We derive an H I mass function (HIMF) for the groups that is consistent with being flatter than the equivalent field HIMF. We also derive a circular velocity distribution function, tracing the luminous dark matter halos in the groups, that is consistent with those of the Local Group and HIPASS galaxies, both of which are shallower than that of clusters or predictions from cold dark matter models of galaxy formation.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing

Source

Astrophysical Journal Supplement Series, Vol. 197, no. 2 (Dec 2011), article no. 28

Publication year

2011

FOR Code(s)

0201 Astronomical and Space Sciences;  0305 Organic Chemistry;  0306 Physical Chemistry (Incl. Structural)

Keyword(s)

Galaxy evolution;  Galaxy formation;  Group galaxies;  Local Group;  Luminosity function;  Mass function

Publisher

Institute of Physics Publishing

ISSN

0067-0049

Publisher URL

http://dx.doi.org/10.1088/0067-0049/197/2/28

Copyright

Copyright © 2011 The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow institutions to archive either the accepted manuscript or the published version of the article. However, you can find an earlier version of the full text here: http://arxiv.org/abs/1110.3431

Peer reviewed