2000A&A...361..444M

An analysis is given of the AGN found in the medium deep X-ray survey in the HQS field HS 47.5/22 . The logN(>S)-logS curve is in good agreement with values in the literature above f_x≃3.4x10^–14ergs/cm²/s. Redshifts are now determined for 71 AGN detected in the X-ray survey. Complete optically and X-ray selected samples were derived. In the optical range, we find a completeness limit of m_b=18.3mag-18.5mag, resulting in a complete optical sample of not more than 18 AGN. X-ray completeness is primarily determined by the identification status. Below 2x10^–13ergs/cm²/s, more than 10% of the X-ray sources remain unidentified giving a complete sample of 26 AGN. Both the optical number-magnitude relation and the X-ray luminosity functions are in agreement with previous determinations. Thus we found no supporting evidence that this area in the sky shows a non-random AGN distribution. A few individual objects are described in detail, among them RX J1001.5+4659 - a possibly extended source connected to a small group of galaxies, and RX J0957.1+4815 - an X-ray selected QSO with deep absorption lines, perhaps a BAL.