Cosmological Constraints from the X-Ray Gas Mass Fraction in the Most Luminous, Relaxed Clusters

Details Cosmological Constraints from the X-Ray Gas Mass Fraction in the Most Luminous, Relaxed Clusters Cosmological Constraints from the X-Ray Gas Mass Fraction in the Most Luminous, Relaxed Clusters

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1314a&link_type=abstract

Chandra Proposal ID #04800458

Mathematics

Logic

Chandra Proposal Id #04800458

Scientific paper

We propose to observe the most X-ray luminous, relaxed clusters of galaxies at high redshifts to measure the apparent variation of the X-ray gas mass fraction with redshift and thereby constrain the present value of the Cosmological Constant, Omega_Lambda. This method, which we have recently applied to Chandra data for lower-redshift clusters, also provides the best available constraint on the mean mass density of the Universe, Omega_M. The proposed observations will allow us to constrain Omega_Lambda to an accuracy of 30%, and provide a direct detection of the effects of the Constant on the geometry of the Universe at 2-3 sigma significance. This would be the first independent confirmation of the SNIa results on Omega_Lambda and represent a major step forwards in cosmological studies.

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