Physics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt.........9b&link_type=abstract
Ph.D dissertation, 2005. Section 0127, Part 0606 123 pages; United States -- Michigan: University of Michigan; 2005. Publicatio
Physics
Galaxy Clusters
Scientific paper
The idea that the gas which ultimately forms the intracluster medium was at an elevated temperature prior to collapse is known as preheating. Preheating is a simple addition to cluster simulations which leads to a more realistic ensemble of clusters. I have found the level of preheating necessary to reproduce the observed scaling relations. The slopes in the ICM mass-temperature, X-ray luminosity-temperature and isophotal size-temperature relations can be simultaneously brought into agreement with observation. Then I studied the physical properties of an ensemble of clusters heated with an entropy of 10 x 5.9 keV cm 2 . Preheating is causing a temperature dependence in the gas fraction which is the driving force behind the tilting previously seen in the slopes of the scaling relations. However, the structure function and associated b-fits are consistent with no temperature dependence. Further these preheated clusters show no evidence of an entropy floor either in terms of a minimum entropy in the ensemble or a flattening of the entropy or density profile. I have also studied, in depth, a single cluster which exhibits coldfront features.
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