The Variation of Baryon Fractions amongst Galaxy Clusters: the Case of Abell 1204

Details The Variation of Baryon Fractions amongst Galaxy Clusters: the Case of Abell 1204 The Variation of Baryon Fractions amongst Galaxy Clusters: the Case of Abell 1204

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..684s&link_type=abstract

Chandra Proposal ID #02800225

Physics

Chandra Proposal Id #02800225

Scientific paper

Clusters of galaxies have often been considered fair samples of the Universe. However, variations are now measured in the baryon fraction of massive clusters. Much of this variation seems likely to be a consequence of non-gravitational heating of the intracluster medium. We have discovered a remarkable case of property variation which calls even this explanation into doubt. The clusters A1060 and A1204 have identical optical richness, X-ray temperature and iron abundance, yet A1204 is 20 times more X-ray luminous. No high spatial resolution, spectral imaging exists for A1204. We propose a modest ACIS observation to accurately measure the baryonic fraction of this cluster, and understand its apparently anomalous luminosity, and thereby test the fair sample hypothesis.

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