X-ray QSO evolution from a very deep ROSAT survey.

Details X-ray QSO evolution from a very deep ROSAT survey. X-ray QSO evolution from a very deep ROSAT survey.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..457j&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 457 - 458

Astronomy and Astrophysics

Astrophysics

Quasars: X-Ray Surveys, Quasars: X-Ray Luminosities

Scientific paper

In the deepest optically identified X-ray survey yet performed, the authors have identified 32 QSOs to a flux limit of 2×10-15erg cm-2 (0.5-2 keV). The survey, performed with the ROSAT PSPC, has 86% spectroscopic completeness. The surface density of QSOs at this flux limit is 210±37 per square degree. The authors have used this survey to measure the QSO X-ray luminosity function (XLF) at low luminosities (Lx < 1044.5erg s-1) and high redshifts (1 < z < 2.5). The highest redshift QSO in the survey has z = 3.4. Combined with the QSOs from the EMSS, the authors find pure luminosity evolution of the form Lx ∝ (1+z)2.8(+0.4,-0.2) is an adequate description of the evolution of the XLF at low redshifts. A redshift cutoff in the evolution is required at z = 1.4 (for q0 = 0.5).

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