The EXOSAT high Galactic latitude survey

Details The EXOSAT high Galactic latitude survey The EXOSAT high Galactic latitude survey

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378...77g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 77-92. Research supported by Royal Society and SERC.

Astronomy and Astrophysics

Astronomy

96

Exosat Satellite, Sky Surveys (Astronomy), X Ray Astronomy, Absorption Spectra, Active Galactic Nuclei, Bl Lacertae Objects, Milky Way Galaxy, White Dwarf Stars, X Ray Sources

Scientific paper

This study presents a survey of serendipitous sources performed in the very soft X-ray band (0.05-2.0 keV) using the Exosat imaging telescopes. It covers 783 sq deg of high Galactic latitude sky and includes 210 serendipitous sources which define a complete (flux-limited) sample. Two hundred of the 210 detected sources are identified via extensive optical and radio observations together with cross-correlations with catalogs of known objects. The log N-log S relation was found to be consistent with that of the Einstein extended Medium-Sensitivity Survey (EMSS) and with the 'Euclidean' value of 1.5. The normalization of the relation is a strong function of the assumed spectral slope of AGN. It is inferred from the consistency with the EMSS results that the average (energy) slope of extragalactic sources in the soft X-ray band is very steep (approximately 1.5). An analysis of the association between AGN detection and Galactic N(H) also shows that the average slope is steep and inconsistent with the canonical value of 0.7.

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