Distant Massive Clusters and Cosmology

Details Distant Massive Clusters and Cosmology Distant Massive Clusters and Cosmology

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aspc..176...51d&link_type=abstract

Observational Cosmology: The Development of Galaxy Systems, Proceedings of the International Workshop held at Sesto Pusteria, Bo

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present a status report of our X-ray study and analysis of a complete sample of distant (z = 0.5-0.8), X-ray luminous clusters of galaxies. We have obtained ASCA and ROSAT observations of the five brightest Extended Medium Sensitivity (EMSS) clusters with z > 0.5. We have constructed an observed temperature function for these clusters, and measured iron abundances for all of these clusters. We have developed an analytic expression for the behavior of the mass-temperature relation in a low-density universe. We use this mass-temperature relation together with a Press-Schechter-based model to derive the expected temperature function for different values of Ω_M. We combine this analysis with the observed temperature functions at redshifts from 0-0.8 to derive maximum likelihood estimates for the value of Ω_M. We report preliminary results of this analysis.

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