Shedding X-ray Light on ``Dark'' Groups of Galaxies

Details Shedding X-ray Light on ``Dark'' Groups of Galaxies Shedding X-ray Light on ``Dark'' Groups of Galaxies

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1558b&link_type=abstract

Chandra Proposal ID #05800317

Computer Science

Chandra Proposal Id #05800317

Scientific paper

We propose Chandra observations of two remarkable ``dark'' groups of galaxies to evaluate the consequences of their extremely low star formation efficiency and the implications for galaxy formation in general. Also known as OLEGS or ``fossil groups'', they exhibit Lx, total mass, and gas mass similar to poor clusters, but optically they contain an isolated elliptical galaxy. A striking common feature is an abnormally high mass to light ratio (~500-1000). These results are however uncertain. Therefore, we have selected from the literature 2 particularly intriguing systems which have not been well-studied. We will compare their optical and X-ray properties with those of normal groups and interpret these results with gasdynamical models to obtain vital insights into galaxy/group formation.

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