Computer Science
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt.........4t&link_type=abstract
Ph.D. Thesis Massachusetts Inst. of Tech., Cambridge.
Computer Science
1
Emission, Galactic Clusters, Galactic Radiation, X Ray Sources, X Rays, Cosmic Gases, Heao 2, Intergalactic Media, Simulation, Temperature Profiles
Scientific paper
We have studied X-ray emission from clusters of galaxies by adopting two complementary approaches. The first consists of a detailed analysis of the available data on a single cluster. For this we have chosen to study the gas around M87 because it is the best observed cluster X-ray source and because all of the data have hitherto not been considered simultaneously. The second approach consists of studying the X-ray emission from a simulated cluster of galaxies. For this, we have used the cluster simulation of Katz & White. We have tested the CDM theory of structure formation by analyzing the nature of the cluster gas and by comparing the simulated cluster to real clusters. The cluster has also been used to test the accuracy of the standard deprojection technique used by observers to extract the cluster mass profile. We have reached the following conclusions concerning the intracluster gas around M87. First, the available data cannot be adequately modeled with density and temperature profiles that are single valued functions of radius (a single phase model). Because of this, we have investigated two multi-phase medium models. The first is the local timescale model of White & Sarazin and the second is an ad hoc power law model where the rate at which mass drops out of the ambient (single phase) medium is simply a power law in radius. We find that the models of White & Sarazin provide an improved fit to the data, whereas the power law model does not. This implies both that the data require mass to be dropping out of the ambient medium and that the dropout rate is well parameterized by the local timescale model. The inferred mass accretion rates are consistent with previous determinations. The putative identification of absorption above the Galactic value from SSS data is not confirmed by our analysis. Moreover, we find that data from the SSS are inconsistent with those of the Einstein Observatory HRI and FPCS. Finally we study a self-consistent model where the gas that drops out of the flow in the local timescale model becomes X-ray absorbing gas.
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