Other
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.4207l&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #42.07; Bulletin of the American Astronomical Society, Vol. 30, p.873
Other
Scientific paper
Results are presented from the analysis of ROSAT HRI and PSPC observations of the CNOC subsample of the EMSS high redshift galaxy clusters. Surface brightness profiles of 13 clusters with 0.17 < z < 0.55 are constructed and fit to isothermal beta models. Where possible, we make a unique combination of both the HRI and PSPC data to improve the fit. Cooling flows and their affect on the data are discussed. We derive total X-ray masses which are compared with both the dynamical masses obtained from galaxy velocities and the projected masses from published gravitational lensing studies. We find no systematic bias factor between X-ray and optical methods across the sample, although individual clusters exhibit mass discrepancies up to a factor of 2. Gravitational lensing masses are observed to be systematically slightly higher than X-ray derived masses across the sample. Strong lensing measurements at a few core radii appear to be somewhat more discrepant (factors > 2 for many clusters) than weak lensing masses calculated at larger radii (factors of ~ 1.5). X-ray derived cluster gas masses are calculated, from which we obtain a cluster baryon fraction of ~ 4%h(-3/2}_{100) , yielding Omega_0 ~ 0.3. In addition, we find that the beta -discrepancy can be resolved for these data using the observed average galaxy density profile.
Carlberg Ray G.
Ellingson Erica E.
Lewis Aaron D.
Morris Simon L.
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