Mathematics – Logic
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hrsx.book.....b&link_type=abstract
High redshift sample of X-ray selected galaxy clusters., by Burke, D. J.. Univ. Durham (UK), Sep 1997, vp.,
Mathematics
Logic
1
Scientific paper
This thesis describes the creation of a X-ray selected galaxy cluster catalogue - the Southern Serendipitous High-redshift Archival ROSAT Cluster (SHARC) catalogue - and the use of the high-redshift subsample in constraining models of structure formation. The ROSAT All Sky Survey has a relatively high flux limit and has been used to create large, local cluster samples. The public availability of data from the pointed phase of PSPC observations means that deep, small-area, X-ray selected cluster surveys can be created. At the flux limits reachable by the PSPC pointings (≡10-14erg cm-2s-1), the dominant source population consists of QSOs and AGNs, with clusters forming ⪉10% of the X-ray population: cluster samples are therefore prone to a high level of contamination. Since clusters are the only class of object which are extended at cosmologically significant distances, this contamination can be greatly reduced by selecting sources which are extended. A reduction method is described which uses a maximum-likelihood fitting procedure, based on the Cash statistic, to detect extended sources. The survey consists of 66 ROSAT PSPC fields, covering an area of 17.7 deg2. Optical and spectroscopy has been used to provide spectroscopic confirmation of the presence of distant galaxy clusters. The Southern SHARC catalogue is 90% complete, and consists of 36 clusters with redshifts 0.05 < z < 0.7 and X-ray luminosities between 7×1042erg s-1 and 4×1044erg s-1. The high-redshift subsample contains 16 clusters with z ≥ 0.3 and luminosities greater than 2×1043erg s-1.
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