Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt........18m&link_type=abstract
Thesis (PhD). UNIVERSITY OF HAWAII, Source DAI-B 62/06, p. 2758, Dec 2001, 195 pages.
Physics
13
Scientific paper
In the ROSAT All-Sky Survey, a region of 80.7 square degrees around the north ecliptic pole (NEP) constitutes the deepest X-ray observation ever achieved of such a large, contiguous area. Here 445 unique sources are detected with fluxes measured at greater than 4 sigma significance. We have identified the physical nature of 443 (99.6%) of these sources through a comprehensive program of imaging and spectroscopy with primarily the UH 2.2m, CFHT 3.6m, and Keck-II 10m telescopes. The main constituents of the resulting catalog are active galactic nuclei (AGN; 49%), Galactic stars (34%), and clusters of galaxies (14%). We have used the complete samples of extragalactic X-ray sources to examine the evolution and distribution of large-scale structure in the universe. Measurements of the cluster X-ray luminosity function and integrated counts show negative evolution in the cluster population at high redshift and high luminosity. Our X-ray analysis of a previously known supercluster at z = 0.087 greatly improves our understanding of this structure-doubling its spatial extent and tripling the cluster/group membership. Also relevant to large- scale structure, and in particular cluster formation, is the discovery of a distant, filamentary cluster at z = 0.81. Working beyond coherent structures, we have measured the degree of clustering in the ROSAT NEP data by calculating the two-point spatial correlation function for clusters and AGN.
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