The origin of the cosmic X-ray background

Details The origin of the cosmic X-ray background The origin of the cosmic X-ray background

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.353..315s&link_type=abstract

Nature (ISSN 0028-0836), vol. 353, Sept. 26, 1991, p. 315-320. Research supported by Royal Society, SERC, Cambridge University I

Astronomy and Astrophysics

Astronomy

169

Cosmic X Rays, Faint Objects, Quasars, Rosat Mission, Satellite Imagery, Active Galactic Nuclei, Background Radiation, Proportional Counters, Sky Surveys (Astronomy)

Scientific paper

A high-resolution image from the Rosat X-ray satellite reveals many faint discrete sources in the 0.1-2-keV energy range. Optical spectroscopy of these sources performed at the Anglo-Australian Telescope shows that many of them are quasars, and the inferred density of quasars on the sky contributes at least 30 percent of the cosmic X-ray background at 1 kev.

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