Choirs, HI Galaxy Groups: Catalogue and Detection of Star-forming Dwarf Group Members
Sarah M. Sweet, Gerhardt Meurer, Michael J. Drinkwater, Virginia, Kilborn, Helga D\'enes, 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

TL;DR
This paper catalogs star-forming dwarf galaxy groups identified through H-alpha observations, revealing their properties, similarities to known groups, and early-stage assembly characteristics, based on HI and optical data.
Contribution
It presents a new catalog of Choir groups with multiple emission line galaxies, highlighting their properties and potential as early-stage galaxy group analogues.
Findings
Most groups are not HI-deficient, indicating early assembly stages.
Groups are very compact, typically 190 kpc in size.
Star formation efficiency increases with stellar mass.
Abstract
H{\alpha} observations centred on galaxies selected from the HI Parkes All Sky Survey (HIPASS, Barnes et al. 2001) typically show one and sometimes two star-forming galaxies within the approximately 15-arcminute beam of the Parkes 64-m HI detections. In our Survey of Ionization in Neutral Gas Galaxies (SINGG, Meurer et al. 2006) we found fifteen 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 HI mass. The ELGs in…
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