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A catalog of intracluster gas temperaturesWe have searched the Einstein Monitor Proportional Counter (MPC) data base for observations of clusters of galaxies. By coadding the MPC spectra obtained during all pointed observations of clusters with IPC count rates greater than 0.1 counts/s, we have obtained sufficient photon statistics to estimate the X-ray temperature of 84 clusters. Combining the MPC results with EXOSAT and Ginga results reported in the literature yields a combined sample of 104 clusters with known X-ray temperatures. One of the best studied X-ray correlations between clusters is that between their X-ray luminosity and gas temperature. We show that the best-fit power-law relation for our combined cluster sample can be explained by the observed increase in the gas-to-stellar mass ratio between low- and high-temperature clusters. The statistical significance of any evolution in our combined X-ray sample has been examined and compared with the statistical properties of clusters culled from optical catalogs. We find that there is strong evidence for a decrease in the X-ray luminosity of optically rich clusters beyond z approximately about 0.06. This result is used to estimate the normalization of the primordial power spectrum of density fluctuations.
Document ID
19930066681
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
David, L. P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Slyz, A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jones, C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Forman, W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Vrtilek, S. D.
(Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Arnaud, K. A.
(NASA Goddard Space Flight Center Greenbelt; Maryland Univ., College Park, United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 412
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A50678
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
Distribution Limits
Public
Copyright
Other

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