Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phdt........20p&link_type=abstract
Proquest Dissertations And Theses 2007. Section 5036, Part 0606 [Ph.D. dissertation].England: University of Southampton (Unite
Physics
Heating, Atmospheres, Galaxy Clusters, Active Galactic Nuclei
Scientific paper
Numerical simulations are used to study the effect of two heating mechanisms proposed to operate in galaxy clusters: AGNs and thermal conduction. The main results of this work are that thermal conduction cannot reproduce the observed characteristics of the temperature and density profiles of galaxy clusters. As a result it must be drastically reduced and so probably is not a significant source of heating. However, even low-power AGNs activity can exert a significant influence over their surroundings. In addition, low-power sources can inflate cavities of the type that are observed in real galaxy clusters.
The heating effect of these cavities can also balance the radiative losses. Theoretical work based on the fraction of galaxies which are detectable in the radio waveband suggests that the low-end of AGN power output is a function of its environment and the mass of the black hole. The effect of accretion and galaxy-galaxy mergers on the M bh - s v relation is also considered. The results suggests that the observed relation can be maintained, regardless of the environment, if significant gravitational radiation is released during the merger of the black holes.
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