Mathematics – Logic
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3406d&link_type=abstract
American Astronomical Society, HEAD meeting #11, #34.06; Bulletin of the American Astronomical Society, Vol. 41, p.711
Mathematics
Logic
Scientific paper
We present the mass--X-ray observable scaling relationships for clusters of galaxies using a XMM-Newton cluster catalog. While the results are roughly consistent with previous observational and theoretical work, we find two major differences. We find a weaker dependence of the gas mass fraction on cluster mass (consistent with a constant) than previous studies. We find 2--3 times the scatter around the best fit mass scaling relationships as expected from cluster simulations or seen in other observational studies. We suggest that this is a consequence of using hydrostatic mass, as opposed to virial mass, and is due to the explicit dependence of the hydrostatic mass on the gradients of the temperature and gas density profiles. We find a larger range of slope in the cluster temperature profiles at r500 than previous observational studies. Both the gas mass fraction and scatter results argue for a more careful study of the differences between various observational results and with cluster simulations, to understand sources of bias and scatter in cosmological studies of galaxy clusters.
Davis David S.
Juett Adrienne
Mushotzky Richard F.
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