Results on the X-ray background and sources from the ROSAT medium sensitivity survey

Details Results on the X-ray background and sources from the ROSAT medium sensitivity survey Results on the X-ray background and sources from the ROSAT medium sensitivity survey

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l...2h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. L2-L5. Research supported by Alexander von Humboldt-

Astronomy and Astrophysics

Astrophysics

117

Background Radiation, Cosmic X Rays, Diffuse Radiation, Radiant Flux Density, X Ray Sources, Interstellar Extinction, Proportional Counters, Rosat Mission, X Ray Spectra

Scientific paper

A total of 184 sources with X-ray fluxes between 10 to the -14th and 2 x 10 to the -13th cgs were discovered in ROSAT PSPC pointings covering 2.6 sq deg. The differential N(S) relation flattens significantly below 2 x 10 to the -14th cgs. In the 1 - 2 keV band the fraction of flux in resolved sources is 20 - 30 percent. The spectrum of the resolved sources is similar to that of the remaining background in the 1 - 2 keV range, both with a power law slope of -1.3. In the deepest pointing, centered on the North-ecliptic Pole, evidence is found of structure in the background on a scale of about 20 arcmin. This may represent a glimpse of the structure of the universe at redshifts of about 1.

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