Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.5301h&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #53.01; Bulletin of the American Astronomical Society, Vol. 29, p.1300
Mathematics
Logic
Scientific paper
The mass function of galaxy clusters and groups provides a direct test of cosmological theories of structure formation and strongly constrains the value of Omega_ {0}, but currently the mass function is poorly determined. First, there are few large statistical samples of clusters, especially at low masses (i.e. poor clusters and groups). Second, few clusters have reliably determined masses since current mass estimation techniques are difficult to apply. However, recent theoretical progress has been made on the relation of galaxy cluster mass to average x-ray temperature. Combined with improvements in the empirically derived relation between x-ray luminosity and average x-ray temperature, a robust scaling of cluster mass to x-ray luminosity can now be obtained. We apply this relation to new x-ray selected samples of clusters available from ROSAT observations to better determine the mass function over several orders of magnitude in mass, from rich clusters to groups.
Horner Donald
Loewenstein Michael
Mushotzky Richard
Scharf Caleb
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