Fossil groups in the local Universe

Details Fossil groups in the local Universe Fossil groups in the local Universe

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1773s&link_type=abstract

Chandra Proposal ID #06800562

Physics

Chandra Proposal Id #06800562

Scientific paper

In a hierarchically evolving universe, the oldest and most undisturbed galaxy systems are low mass groups which have not yet been absorbed into larger halos. Such 'fossil groups' consist of a giant elliptical galaxy embeded in a large, group-scale halo of hot gas. Only a handful of these objects have been studied so far, and their properties point to their being repositories of the lowest entropy and least disrupted intergalactic gas present in collapsed halos. We propose to observe two of the closest known fossil groups, in order to establish their properties as a class. Moreover, these observations will enable us to probe gas physics in conditions which are uniquely susceptible to radiative cooling instabilities, thereby providing a critical test of gas heating and feedback models.

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