CLoGS - The Complete Local-Volume Groups Survey
Abstract
The current lack of a statistically representative sample of nearby galaxy groups observed in the X-ray is a serious hindrance to studies of galaxy evolution, structure formation, and feedback processes. To address this problem we have defined an optically selected, statistically complete sample of 53 nearby galaxy groups, screened to exclude systems that are uncollapsed or embedded in larger structures. We have X-ray observations of about 2/3 of the sample, including all of the richer half, and have completed low-frequency observations of the full sample with the Giant Metrewave Radio Telescope (GMRT). Optical selection avoids the known bias toward centrally concentrated cool-core systems in X-ray samples chosen from the ROSAT All-Sky Survey, while X-ray follow-up will allow us to confirm that the groups are truly virialized. The combination of X-ray, optical, and radio data for these nearby systems means that as well as determining the physical properties of the local group population for the first time, we will be able to study the impact of AGN on the intra-group medium and member galaxies. In this poster, we present details of our selection and first results from new Chandra, XMM-Newton, and GMRT observations of our groups, showing the range of group morphologies and properties in the sample.
- Publication:
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AAS/High Energy Astrophysics Division #13
- Pub Date:
- April 2013
- Bibcode:
- 2013HEAD...1311606V