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H{\alpha} observations centred on galaxies selected from the HI Parkes AllSky Survey (HIPASS, Barnes et al. 2001) typically show one and sometimes twostar-forming galaxies within the approximately 15-arcminute beam of the Parkes64-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 ormore emission line galaxies (ELGs). We name these fields Choir groups. In themost extreme case we found a field with at least nine ELGs. In this paper wepresent a catalogue of Choir group members in the context of the wider SINGGsample. The dwarf galaxies in the Choir groups would not be individuallydetectable in HIPASS at the observed distances if they were isolated, but aredetected in SINGG narrow-band imaging due to their membership of groups withsufficiently large total HI mass. The ELGs in these groups are similar to thewider SINGG sample in terms of size, H{\alpha} equivalent width, and surfacebrightness. Eight of these groups have two large spiral galaxies with severaldwarf galaxies and may be thought of as morphological analogues of the LocalGroup. However, on average our groups are not significantly HI-deficient,suggesting that they are at an early stage of assembly, and more like the M81group. The Choir groups are very compact at typically only 190 kpc in projecteddistance between the two brightest members. They are very similar to SINGGfields in terms of star formation efficiency (the ratio of star formation rateto HI mass; SFE), showing an increasing trend in SFE with stellar mass.

Choirs, HI Galaxy Groups: Catalogue and Detection of Star-forming Dwarf Group Members