Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992rrgo.conf....1h&link_type=abstract
In its Contributions to the Joint Discussion 3: Results from Rosat and GRO and Other Recent High Energy Astrophysics Missions of
Astronomy and Astrophysics
Astronomy
1
Background Radiation, Emission Spectra, Proportional Counters, Radiation Spectra, Rosat Mission, Sky Surveys (Astronomy), Spaceborne Astronomy, Galactic Radiation, Line Spectra, Plasma Density, Radiation Absorption, Space Plasmas, X Ray Astronomy
Scientific paper
A series of 20 deep pointed observations with the ROSAT PSPC (Position Sensitive Proportional Counter) is discussed. Exactly 530 X-ray sources with 0.5 to 2 keV fluxes down to 3(10)-15 erg cm-2s-1 were discovered in 5.9 deg2. The N(greater than S) relation of the sources selected in the 0.5 to 2 keV band shows a density in excess of 200 deg-2 at the faintest fluxes and a flattening below 2(10)-14 erg cm-2s-1. The average spectrum of those sources is a power law with energy index 1.2 +/- 0.1. The absorption column densities are consistent with the galactic HI columns. More than 50 percent of the 1 to 2 keV background was resolved into discrete sources in the deepest field. The total background spectrum shows an emission line feature around 0.65 keV, most probably due to to O7-O8 from a 2,000,000 K plasma. Above approximately 1 keV the background is dominated by a power law spectrum with a normalization of 13.4 +/- 0.2 keV cm-2 s -1 sr-1 keV-1 and a slope 1.2 +/- 0.1, i.e., considerably steeper than the extrapolation from higher energies.
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