Mathematics – Logic
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt........19h&link_type=abstract
Thesis (PhD). UNIVERSITY OF VIRGINIA, Source DAI-B 62/10, p. 4587, Apr 2002, 194 pages.
Mathematics
Logic
10
Scientific paper
We have used the Röntgensatellit (ROSAT ) High Resolution Imager (HRI) observations to study a sample of nine cooling flow clusters in which the central cD galaxies are strong radio sources. Our focus is on the central structures of the intracluster medium (ICM), and on the interactions between the X-ray emitting gas and radio plasma. We find that the central X-ray emission structures are very complex. Striking X-ray features, such as X-ray clumps, holes, and bar-like structures, are associated with radio emissions from the central cD galaxies. Morphologically, these radio sources divide into two groups. Group 1 has well-defined radio lobes and jets. The lobes are strongly polarized in the radio, but have high Faraday rotations. The radio lobes are the regions of lower X-ray emission than surrounding areas. The X-ray/radio anti-correlation, and large Faraday rotations all suggest that the radio lobes have displaced but are confined by the ambient X- ray emitting gas. The radio sources in Group 2 are amorphous and unpolarized, with little evidence for strong radio jets. The radio emissions are positively correlated with the X-ray emissions. The nonthermal radio pressures are much less than that of the X-ray gas, unless the radio sources are highly filamentary, and/or the energy ratio of the heavy particles to electrons is much larger than 102. All of these suggest that the X-ray and radio emitting plasmas are mixed in these two amorphous radio sources. Abell 4059 was studied in more detail using additional ROSAT Position Sensitive Proportional Counter (PSPC) spectral data. We derived the gas temperature distribution in the cluster. We also studied a well-known, irregular Hercules cluster (Abell 2151). The cluster has a rather irregular X-ray structure, which we argue indicates that it is undergoing a strong subcluster merger. We found that gas stripping in one of the subclusters may be very efficient, and may be an important source for the hot gas in the subcluster. We also investigated mass distributions of the hot gas, galaxies, and dark matters in the subcluster.
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