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Cosmology with EMSS Clusters of GalaxiesWe 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 Omega(sub M) = 0.45 +/- 0.1 if Lambda = 0 and Omega = 0.27 +/- 0.1 if Lambda + Omega(sub M) = 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.
Document ID
20000021232
Acquisition Source
Goddard Space Flight Center
Document Type
Other
Authors
Donahue, Megan
(Space Telescope Science Inst. Baltimore, MD United States)
Voit, G. Mark
(Space Telescope Science Inst. Baltimore, MD United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 1999
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-3208
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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