A survey for hard spectrum Rosat sources

Details A survey for hard spectrum Rosat sources A survey for hard spectrum Rosat sources

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..822p&link_type=abstract

X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G

Computer Science

Databases

X-Ray Sources, X-Ray Bursts, Background Radiations, Galactic Nuclei, Circumnuclear Matter, And Bulges, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Quasars, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc.

Scientific paper

We have performed a survey of 188 Rosat fields looking for sources significantly harder than the X-ray background (α~0.5), with the aim of understanding the nature of sources that produce its remaining unresolved fraction. Our sample of 147 hard sources has a steeper-than-Euclidean log N-log S. We have spectroscopic identifications for 62 of the hard sources: 28 are broad line AGN, 12 are narrow emission line galaxies, and the remainder are galaxies without emission lines, clusters of galaxies, and Galactic stars. The properties of these sources are discussed. Contrary to currently favored theories for the production of the X-ray background, we do not find a single example of a high redshift type 2 QSO. .

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