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The X‐ray evolution of clusters of galaxies
Author(s) -
Jones L. R.,
Scharf C.,
Perlman E.,
Ebeling H.,
Horner D.,
Wegner G.,
Malkan M.,
Mchardy I.
Publication year - 1998
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2123190141
Subject(s) - rosat , astrophysics , physics , luminosity function , redshift , cluster (spacecraft) , luminosity , galaxy , galaxy cluster , astronomy , x ray , optics , computer science , programming language
The WARPS survey currently contains 48 X‐ray selected clusters and groups of galaxies, detected serendipitously in ROSAT PSPC archival pointed observations. The survey includes the highest redshift X‐ray selected cluster known (z=0.8325). The redshift range is large enough for evolutionary effects to be studied within the sample. Here we describe the X‐ray luminosity function and Log(N)‐Log(S) results for the initial complete sample of 29 spectroscopically confirmed clusters. We find that the X‐ray luminosity function does not evolve at z∽0.5 for cluster luminosities of ∽10 44 erg s −1 , but that there is a hint of positive evolution at lower luminosities from the number of groups & clusters found in the faintest available X‐ray cluster sample (the UK deep survey).