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Choirs, H I galaxy groups: catalogue and detection of star-forming dwarf group members

Sweet, Sarah M. and Hanish, Dan and Heckman, Tim (2013) Choirs, H I galaxy groups: catalogue and detection of star-forming dwarf group members. Monthly Notices of the Royal Astronomical Society, 433 (1). pp. 543-559. ISSN 0035-8711.

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Hα observations centred on galaxies selected from the H i Parkes All-Sky Survey (HiPASS) typically show one and sometimes two star-forming galaxies within the ∼15 arcmin beam of the Parkes 64 m H i detections. In our Survey for Ionization in Neutral Gas Galaxies (SINGG) we found 15 cases of HiPASS sources containing four or more emission line galaxies (ELGs). We name these fields Choir groups. In the most extreme case, we found a field with at least nine ELGs. In this paper, we present a catalogue of Choir group members in the context of the wider SINGG sample. The dwarf galaxies in the Choir groups would not be individually detectable in HiPASS at the observed distances if they were isolated, but are detected in SINGG narrow-band imaging due to their membership of groups with sufficiently large total H i mass. The ELGs in these groups are similar to the wider SINGG sample in terms of size, Hα equivalent width and surface brightness. Eight of these groups have two large spiral galaxies with several dwarf galaxies and may be thought of as morphological analogues of the Local Group. However, on average our groups are not significantly H i deficient, suggesting that they are at an early stage of assembly, and more like the M81 group. The Choir groups are very compact at typically only 190 kpc in projected distance between the two brightest members. They are very similar to SINGG fields in terms of star formation efficiency (SFE; the ratio of star formation rate to H i mass), showing an increasing trend in SFE with stellar mass.

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Sweet, Sarah M.0000-0002-1576-2505
Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 April 28. Received 2013 April 22; in original form 2012 November 7. First published online: May 21, 2013. We wish to thank the anonymous referees for their helpful comments, David Schiminovich for making his data available to us and Aaron Robotham for useful discussions. We acknowledge funding support from the University of Queensland–University of Western Australia Bilateral Research Collaboration Award and the Australian Research Council (grant DP110102608). This research has made use of the NASA’s Astrophysics Data System. We also made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research used the facilities of the Canadian Astronomy Data Centre operated by the National Research Council of Canada with the support of the Canadian Space Agency. JHK is supported by Korean Research Foundation (KRF) grant funded by the Korean government (MEST), No. 2010–0000712.
Funding AgencyGrant Number
University of QueenslandUNSPECIFIED
University of Western AustraliaUNSPECIFIED
Australian Research CouncilDP110102608
Canadian Space Agency (CSA)UNSPECIFIED
Korean Research FoundationUNSPECIFIED
Ministry of Education, Science and Technology (Korea)2010-0000712
Subject Keywords:galaxies: groups: general; galaxies: dwarf; Local Group; radio continuum: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20130906-085751923
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Official Citation:Sarah M. Sweet, Gerhardt Meurer, Michael J. Drinkwater, Virginia Kilborn, Helga Dénes, Kenji Bekki, Dan Hanish, Henry Ferguson, Patricia Knezek, Joss Bland-Hawthorn, Michael Dopita, Marianne T. Doyle-Pegg, Ed Elson, Ken Freeman, Tim Heckman, Robert Kennicutt, Ji Hoon Kim, Bärbel Koribalski, Martin Meyer, Mary Putman, Emma Ryan-Weber, Chris Smith, Lister Staveley-Smith, O. Ivy Wong, Rachel Webster, Jessica Werk, Martin Zwaan; Choirs, H I galaxy groups: catalogue and detection of star-forming dwarf group members, Monthly Notices of the Royal Astronomical Society, Volume 433, Issue 1, 21 July 2013, Pages 543–559,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41136
Deposited By: Tony Diaz
Deposited On:17 Sep 2013 23:36
Last Modified:20 Feb 2020 22:27

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