A deep ROSAT survey - IX. The discovery of a high-redshift type 2 QSO

Details A deep ROSAT survey - IX. The discovery of a high-redshift type 2 QSO A deep ROSAT survey - IX. The discovery of a high-redshift type 2 QSO

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277l..31a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 2, pp. L31-L34.

Astronomy and Astrophysics

Astronomy

50

Galaxies: Active, Quasars: General, X-Rays: General

Scientific paper

We report the discovery of a high-redshift, narrow-emission-line galaxy identified in the optical follow-up of deep ROSAT fields. The object has a redshift of z=2.35 and its narrow emission lines together with its high optical and X-ray luminosities imply that it is a rare example of a type 2 QSO. Either the intrinsic X-ray absorption is very low or we are observing scattered flux which does not come directly from the nucleus. The X-ray spectrum of this object is harder than that of normal QSOs, and it is possible that a hitherto unidentified population of similar objects at fainter X-ray fluxes could account for the missing hard component of the X-ray background.

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