Star-Forming HI-Rich Galaxy Groups in the Local Universe

Details Star-Forming HI-Rich Galaxy Groups in the Local Universe Star-Forming HI-Rich Galaxy Groups in the Local Universe

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924613m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #246.13

Astronomy and Astrophysics

Astronomy

Scientific paper

Follow-up H-alpha observations of the HIPASS survey typically show one, and sometimes two star forming galaxies within the 15 arc-minute beam of the Parkes 64m HI detections. In our Survey of Ionization in Neutral Gas Galaxies (SINGG) we found 15 cases of HIPASS sources containing four or more Emission Line Galaxies (ELGs). In the most extreme case we found groups with at least 9 ELGs. Most of the ELGs found in these groups are very different from those in the field. The larger more obvious galaxies are usually distorted, and typically have a few dwarf galaxy companions. These dwarfs typically have very odd compact morphologies, some being barely distinguishable from a single HII region, yet not obviously attached to a host. Here we highlight some of the properties of these groups and the galaxies they contain. We outline our current work on these systems including follow-up integral field unit optical spectroscopy, HI synthesis imaging and simulation work to understand these peculiar dense star forming groups.

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