Contributors to the X-ray background at faint fluxes.

Astronomy and Astrophysics – Astrophysics

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X-Ray Surveys: Quasars, X-Ray Surveys: Emission-Line Galaxies, X-Ray Background: Emission-Line Galaxies

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Results of the deepest fully identified ROSAT survey are presented. The survey is complete to a flux limit of 2×10-15erg cm-2s-1 (0.5-2 keV). At brighter fluxes (≥10-14erg cm-2s-1) the results of previous less deep X-ray surveys are confirmedd with 83% of the sources being QSOs. However at ≤2.5×10-15erg cm-2s-1 only 18% are QSOs. At these lower fluxes the survey is dominated by a population of narrow emission line galaxies (NELGs), lying mainly in the redshift range 0.2-0.4, whose optical spectra are similar to those of the active half of the field galaxy population at the same redshift. The NELGs appear to be a mixture of starburst galaxies and true AGN. The average NELG X-ray spectrum is harder than that of the QSOs, and similar to that of the remaining unresolved cosmic soft X-ray background (XRB). The NELGs, are a major contributor to the XRB. Their source count rises rapidly and, if it continues to do so at fainter fluxes, they will contribute all of the remaining cosmic soft XRB by ≡3×10-16erg cm-2s-1.

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