Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt.........1b&link_type=abstract
Ph.D. Thesis, Universita' di Trieste (Italy)
Mathematics
Logic
1
Scientific paper
The last decade has seen a poderous progress in the research of galaxy clusters. In fact, the application of modern technologies (CCDs, optical fibers, large aperture optical and X-ray telescopes, etc.) in the field of astrophysical observations has allowed fundamental studies of nearby galaxy clusters, both of the optical component of such objects, i.e. galaxies, and the X-ray emitting intracluster gas. Moreover, systematic searches of these objects done by new generation optical and X-ray telescopes have produced valuable samples of medium-distant clusters, helping us to shed light on the evolution of their physical properties (abundance, mass, temperature, etc.), with particular reference to the distribution functions of such quantities. In particular, the cluster abundance distribution in function of redshift is very important since it is strictly connected to the cosmological parameters. From these consideration it is clear that the search for galaxy systems at different redshifts is a fundamental task in modern observational astrophysics. In this work I discuss the topic of searching for galaxy clusters both in X-ray surveys and in optical data. In particular, the main result is the building of a new galaxy cluster catalog based on a serendipitous search in Chandra X-ray archival data. The first chapter describes the general properties of galaxy systems with emphasis on their scientific relevance and the methods used to identify them in the sky. In the second chapter I describe the Chandra X-ray observatory and explain why it is a good instrument to detect clusters. In chapter three I present the characteristics of my survey, the reduction of data, the technique of detection of X-ray sources and the catalog of detected clusters. By computing the sky coverage of the survey I also present a first determination of the cluster cumulative log N-log S relation and show that it is in agreement with results from previous deep ROSAT-based surveys. Finally, in chapter four, I face the problem of detecting galaxy systems in optical fields and describe a new detection technique based on Voronoi tessellation. At the end of this work I also include an appendix collecting the scientific papers published during the PhD course which are not discussed in the main body of the thesis.
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