Discovery of a major new contributor to the X-ray background at very faint X-ray fluxes

Details Discovery of a major new contributor to the X-ray background at very faint X-ray fluxes Discovery of a major new contributor to the X-ray background at very faint X-ray fluxes

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18511904j&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #119.04; Bulletin of the American Astronomical Society, Vol. 26, p.1517

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe results from the deepest optically identified ROSAT survey yet performed, designed to resolve as much of the soft X-ray background as possible. The ROSAT PSPC exposure of 110 ksec reaches a limiting X-ray flux of 2x10(-15) erg cm(-2) s(-1) (0.5-2 keV). At this flux limit we have currently optically identified a total of 84 sources, representing 82% completeness. At relatively bright fluxes (>10(-14) erg cm(-2) s(-1) ) QSOs dominate the survey. However below a flux of 5x10(-15) erg cm(-2) s(-1) a population of narrow emission line galaxies dominates. The number counts of these faint galaxies rise steeply at faint X-ray fluxes and they are clearly a major new contributor to the X-ray background. They contribute 9-20% of the X-ray background at our flux limit. Optical emission line diagnostics indicate that they are a mixture of Sy2 galaxies, possible starburst galaxies and relatively normal galaxies at their redshifts of z~0.2-0.5.

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