The Galaxy Cluster Luminosity-Temperature Relationship and Iron Abundances: A Measure of Formation History? | Zendy

Caleb Scharf | Zendy; R. F. Mushotzky | Zendy

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The Galaxy Cluster Luminosity-Temperature Relationship and Iron Abundances: A Measure of Formation History?

Author(s) -

Caleb Scharf,

R. F. Mushotzky

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310815

Subject(s) - astrophysics , luminosity , cluster (spacecraft) , galaxy cluster , physics , galaxy , abundance (ecology) , brightest cluster galaxy , velocity dispersion , galaxy formation and evolution , type cd galaxy , ecology , biology , computer science , programming language

Both the X-ray luminosity-temperature (L-T) relationship and the ironabundance distribution of galaxy clusters show intrinsic dispersion. Using alarge set of galaxy clusters with measured iron abundances we find acorrelation between abundance and the relative deviation of a cluster from themean L-T relationship. We argue that these observations can be explained bytaking into account the range of cluster formation epochs expected within ahierarchical universe. The known relationship of cooling flow mass depositionrate to luminosity and temperature is also consistent with this explanation.From the observed cluster population we estimate that the oldest clustersformed at z>~2. We propose that the iron abundance of a galaxy cluster canprovide a parameterization of its age and dynamical history.Comment: 13 pages Latex, 2 figures, postscript. Accepted for publication in ApJ Letter

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