NASA NTRS · 19970024668
X-ray QSO evolution from a very deep ROSAT survey
Abstract
Some 32 quasi-stellar objects (QSOs) were identified to a flux limit of 2 x 10(exp -15) erg/sq cm in the deepest optically identified X-ray survey performed to date. This Rosat position sensitive proportional counter survey (PSPC) is spectroscopically 86 percent complete. The surface density of quasars at this flux limit is 210 +/- 37 per sq deg. The QSO X-ray luminosity function was measured at low luminosities and high redshifts, the highest of which was 3.4.
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Jones, L. R., McHardy, I. M., Merrifield, M. R., Mason, K. O., Smith, P. J., Abraham, R. G., Branduardi-Raymont, G., Newsam, A. M., Romero-Colmanero, E.. 1996-02-01. X-ray QSO evolution from a very deep ROSAT survey. https://ntrs.nasa.gov/citations/19970024668
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