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26 April 2024 |
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X-ray QSO evolution from a very deep ROSAT survey | | L.R. Jones
; I.M. McHardy
; M.R. Merrifield
; K.O. Mason
; P.J. Smith
; R.G. Abraham
; G. Branduardi-Raymont
; A.M. Newsam
; G. Dalton
; M. Rowan-Robinson
; G. Luppino
; | | Date: |
16 Oct 1996 | | Subject: | astro-ph | | Affiliation: | 1 and 2), I.M. McHardy , M.R. Merrifield , K.O. Mason , P.J. Smith , R.G. Abraham , G. Branduardi-Raymont , A.M. Newsam , G. Dalton , M. Rowan-Robinson , G. Luppino ( NASA/GSFC, Southampton University, MSSL, IoA Cambridge, University of Oxford, | | Abstract: | In the deepest optically identified X-ray survey yet performed, we have identified 32 X-ray selected QSOs to a flux limit of 2x10^{-15} erg cm^{-2} s^{-1} (0.5-2 keV). The survey, performed with the ROSAT PSPC, has 89% spectroscopic completeness. The QSO log(N)-log(S) relation is found to have a break to a flat slope at faint fluxes. The surface density of QSOs at the survey limit is 230+/-40 per square degree, the largest so far of any QSO survey. We have used this survey to measure the QSO X-ray luminosity function at low luminosities (Lx<10^{44.5} erg s^{-1}) and high redshifts (1 | | Source: | arXiv, astro-ph/9610124 | | Services: | Forum | Review | PDF | Favorites | |
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