A deep X ray survey in the Lockman hole and the soft X ray log N - log S

Details A deep X ray survey in the Lockman hole and the soft X ray log N - log S A deep X ray survey in the Lockman hole and the soft X ray log N - log S

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9420174h&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Background Radiation, Rosat Mission, Sky Surveys (Astronomy), X Ray Astronomy, Calibrating, Line Spectra, Spectrum Analysis, X Ray Sources, X Ray Telescopes

Scientific paper

The longest pointed observation (152 ksec) with the Rosat position sensitive proportional counter in the direction of the absolutely lowest neutral hydrogen column density is discussed. 26 shallower fields from the Rosat medium sensivity survey are analyzed. 1176 X-ray sources were detected in at least one Rosat energy band in these fields covering a total solid angle of 9.3 deg; 661 of these sources constitute a statistically complete sample detected in the hard band with 0.5 to 2 keV fluxes greater than 2.5 times 10 to the power of minus 15 erg/sq cm s. The faintest limiting flux of the survey is analyzed. Detailed simulations show that confusion effects and other selection biases are relatively small and can be corrected for in the sample. From an analysis in the Lockman field, a best fit slope of approximately 1.8 is found for the extrapolation of the differential X-ray counts below 2.5 times 10 to the power of minus 15 erg/sq cm s. On the basis of this analysis an upper limit of approximately 25% can be found for a truly diffuse background component in the Rosat hard band.

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