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The evolution of X-ray clusters in a cold plus hot dark matter universeWe present the first self-consistently computed results on the evolution of X-ray properties of galaxy clusters in a cold + hot dark matter (CHDM) model. We have performed a hydrodynamic plus N-body simulation for the COBE-compatible CHDM model with standard mass components: Omega(sub hot) = 0.3, Omega (sub cold) = 0.6 and Omega(sub baryon) = 0.1 (h = 0.5). In contrast with the CDM model, which fails to reproduce the observed temperature distribution function dN/dT (Bryan et al. 1994b), the CHDM model fits the observational dN/dT quite well. Our results on X-ray luminosity are less firm but even more intriguing. We find that the resulting X-ray luminosity functions at redshifts z = 0.0, 0.2, 0.4, 0.7 are well fit by observations, where they overlap. The fact that both temperatures and luminosities provide a reasonable fit to the available observational data indicates that, unless we are missing some essential physics, there is neither room nor need for a large fraction of gas in rich clusters: 10% (or less) in baryons is sufficient to explain their X-ray properties. We also see a tight correlation between X-ray luminosity and gas temperature.
Document ID
19950040635
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bryan, Greg L. (University of Illinois at Urbana-Champaign, Urbana, IL United States)
Klypin, Anatoly (New Mexico State University Las Cruces, NM, United States)
Loken, Chris (New Mexico State University Las Cruces, NM, United States)
Norman, Michael L. (University of Illinois at Urbana-Champaign, Urbana, IL United States)
Burns, Jack O. (New Mexico State University Las Cruces, NM, United States)
Date Acquired
August 16, 2013
Publication Date
December 10, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 437
Issue: 1
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF ASC-93-18185
CONTRACT_GRANT: NAGW-3152
Distribution Limits
Public
Copyright
Other