Cosmology with EMSS Clusters of Galaxies

Details Cosmology with EMSS Clusters of Galaxies Cosmology with EMSS Clusters of Galaxies

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...0021233d&link_type=abstract

Technical Report, Space Telescope Science Inst. Baltimore, MD United States

Computer Science

Cosmology, Galactic Evolution, Galactic Clusters, Red Shift, Temperature, Sensitivity, Cluster Analysis, Statistical Analysis, Maximum Likelihood Estimates

Scientific paper

We use ASCA observations of the Extended Medium Sensitivity Survey sample of clusters of galaxies to construct the first z = 0.5 - 0.8 cluster temperature function. This distant cluster temperature function, when compared to local z approximately 0 and to a similar moderate redshift (z = 0.3 - 0.4) temperature function strongly constrains the matter density of the universe. Best fits to the distributions of temperatures and redshifts of these cluster samples results in OmegaM = 0.45 +/- 0.1 if Lambda = 0 and Omega = 0.27 +/- 0.1 if Lambda + OmegaM = 1. The uncertainties are 1sigma statistical. We examine the systematics of our approach and find that systematics, stemming mainly from model assumptions and not measurement errors, are about the same size as the statistical uncertainty +/- 0.1. In this poster proceedings, we clarify the issue of a8 as reported in our paper Donahue & Voit (1999), since this was a matter of discussion at the meeting.

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