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ID: 5934.0, MPI für extraterrestrische Physik / High Energy Astrophysics at MPE
A new measurement of the X-ray temperature function of clusters of galaxies
Authors:Ikebe, Y.; Reiprich, T. H.; Böhringer, H.; Tanaka, Y.; Kitayama, T.
Date of Publication (YYYY-MM-DD):2002-03
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:3
Start Page:773
End Page:790
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a newly measured X-ray temperature function of galaxy clusters using a complete flux-limited sample of 61 clusters. The sample is constructed with the total survey area of 8.14 steradians and the flux limit of 1.99 x 10(-11) ergs s(-1) cm(-2) in the 0.1-2.4 keV band. X-ray temperatures and fluxes of the sample clusters were accurately measured with ASCA and ROSAT data. The derived temperature function covers an unprecedentedly wide temperature range of 1.4-11 keV. By fitting these data with theoretically predicted temperature functions given by the Press-Schechter formalism together with a recent formation approximation and the CDM power spectrum, we obtained tight and individual constraints on Omega(m,0) and sigma(8). We also employed the Formation-Epoch model in which the distribution in the formation epoch of clusters as well as the temperature evolution are taken into account, showing significantly different results. Systematics caused by the uncertainty in the mass-temperature relation are studied and found to be as large as the statistical errors.
Free Keywords:cosmology : observations; cosmological : parameters; X-rays : galaxies : clusters
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Max Planck Inst Extraterr Phys, Postfach 1312, D-85741; Garching, Germany; Max Planck Inst Extraterr Phys, D-85741 Garching, Germany; Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA; Inst Space & Astronaut Sci, Kanagawa 2298510, Japan; Toho Univ, Dept Phys, Chiba 2748510, Japan
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