Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262l..21o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. L21-L24.
Astronomy and Astrophysics
Astrophysics
164
Galactic Evolution, Open Clusters, Space Density, X Ray Sources, Rosat Mission, Temperature Distribution
Scientific paper
We examine the constraints that can be set on galaxy formation theory from the temperature distribution function of X-ray clusters in universes with arbitrary density. Present observations severely constrain the power spectrum. In agreement with previous works in the case Omega(0) = 1, we find that only n is approximately equal to -2 is consistent with the present observations. This conclusion is reinforced by the recent discovery of a 13.6 keV cluster (Arnaud et al., 1992). Both open and critical density models fit present data. However, redshift evolution is very different; high temperature clusters should exist at large redshift in low density universes. We show that ROSAT observations may provide strong constraints on Omega(0).
Blanchard Alain
Oukbir Jamila
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