Verification of the Cluster Gas Fraction as a Cosmological Tool

Details Verification of the Cluster Gas Fraction as a Cosmological Tool Verification of the Cluster Gas Fraction as a Cosmological Tool

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2034m&link_type=abstract

Chandra Proposal ID #07800902

Mathematics

Logic

Chandra Proposal Id #07800902

Scientific paper

The cluster gas fraction has emerged as a promising tool to constrain cosmological parameters. The most interesting application relies on the assumption that already at relatively small radii such as r_2500, f_gas is reasonably close to the universal value and does not depend on redshift. However, recently we obtained accurate Chandra temperature profiles for a sample of nearby relaxed clusters, that extend at least twice as far. The gas fractions within r_2500 derived using these data show a systematic trend with mass, which may introduce bias in cosmological tests. The trend is absent at larger radii. The sample on which these conclusions are based is small, and we propose to observe 3 more relaxed clusters (in addition to 1 GTO target) covering a range of temperatures to verify it.

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