Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-06-04
Astronomy and Astrophysics
Astrophysics
13 pages Latex, 2 figures, postscript. Accepted for publication in ApJ Letters
Scientific paper
10.1086/310815
Both the X-ray luminosity-temperature (L-T) relationship and the iron abundance distribution of galaxy clusters show intrinsic dispersion. Using a large set of galaxy clusters with measured iron abundances we find a correlation between abundance and the relative deviation of a cluster from the mean L-T relationship. We argue that these observations can be explained by taking into account the range of cluster formation epochs expected within a hierarchical universe. The known relationship of cooling flow mass deposition rate to luminosity and temperature is also consistent with this explanation. From the observed cluster population we estimate that the oldest clusters formed at z>~2. We propose that the iron abundance of a galaxy cluster can provide a parameterization of its age and dynamical history.
Mushotzky Richard F.
Scharf Caleb. A.
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