a Search for Small-Scale Structure in the Rasscals Galaxy Groups

Details a Search for Small-Scale Structure in the Rasscals Galaxy Groups a Search for Small-Scale Structure in the Rasscals Galaxy Groups

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1003g&link_type=abstract

Chandra Proposal ID #03800599

Astronomy and Astrophysics

Astrophysics

Chandra Proposal Id #03800599

Scientific paper

Chandra has the necessary resolution to pick out small-scale structure within the ROSAT All Sky Survey---Center for Astrophysics Loose Systems (RASSCALS). This catalog of 260 nearby galaxy groups contains several objects that are too X-ray luminous for their small (< 150 km/s) velocity dispersions. The excess emission could be due to a central cooling flow or to embedded sources similar to those seen in rich clusters such as Abell 2256 and 3C295. We propose to use the ACIS-I to observe the two RASSCALS with the lowest dispersions (60 +/- 18 and 80 +/- 27 km/s) for a total of 70 ksec. Besides finding density enhancements in the gas, the observations can reveal the temperature and metallicity structures of these very low mass systems of galaxies.

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