Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992eocm.rept..111h&link_type=abstract
In ESA, Environment Observation and Climate Modelling Through International Space Projects. Space Sciences with Particular Empha
Astronomy and Astrophysics
Astronomy
Background Radiation, Extragalactic Radio Sources, Proportional Counters, Rosat Mission, Space Plasmas, X Ray Astronomy, X Ray Sources, Emission Spectra, Line Spectra, Spaceborne Astronomy, X Ray Absorption, X Ray Spectra
Scientific paper
A series of 32 deep pointed observations with the Rosat PSPC (Position Sensitive Proportional Counter) is discussed. Nine hundred fifty-five X-ray sources with 0.5 to 2 keV fluxes down to 3 x 10-15 erg/sq cm(s) were discovered in 9.8 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 approximately 250/deg squared at the faintest fluxes and a flattening below 2 x 10-14 erg/sq cm(s). The average spectrum of those sources is a power law with energy index 1.09 +/- 0.07. The absorption column densities are consistent with the galactic H 1 columns. More than 50 percent of the 1 to 2 keV background was resolved into discrete sources in the deepest fields. The total background spectrum shows an emission line feature around 0.65 keV, most probably due to O7-O8 from a 2,000,000 plasma. Above approximately 1 keV the background is dominated by a power law spectrum with a normalization of 13.6 +/- 0.2 KeV/sq cm/(s)(sr)(keV) and a slope 1.04 +/- 0.06, i.e. considerably steeper than the extrapolation from higher energies.
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