Study of a New Class of Mass Concentrations in the Universe

Details Study of a New Class of Mass Concentrations in the Universe Study of a New Class of Mass Concentrations in the Universe

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop..112v&link_type=abstract

Chandra Proposal ID #01800625

Physics

Chandra Proposal Id #01800625

Scientific paper

We propose to study 3 members of a newly discovered class of mass concentrations in the Universe, detected as ROSAT serendipitous extended sources. These are isolated elliptical galaxies surrounded by extended, massive dark matter halos typical of small clusters. These objects have estimated M/L and Mgas/L ratios 5-9 and 2-3 times those of normal clusters, respectively. If high mass values in these extremely relaxed objects are confirmed by AXAF, their very existence would have profound implications. In particular, constraints on Omega from cluster gas fraction and M/L ratios may be invalidated. Also, since there should have been fewer supernovae per unit gas mass in these objects, they provide a unique possibility to separate effects of gravity and galaxy feedback on cluster formation.

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