Multiwavelength observations of the field HS47.5/22 in Ursa Major. II. AGN statistics

Details Multiwavelength observations of the field HS47.5/22 in Ursa Major. II. AGN statistics Multiwavelength observations of the field HS47.5/22 in Ursa Major. II. AGN statistics

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...361..444m&link_type=abstract

Astronomy and Astrophysics, v.361, p.444-450 (2000)

Astronomy and Astrophysics

Astrophysics

Galaxies: Quasars: General, Galaxies: Quasars: Individual: Rx J0957.1+4815, Galaxies: Quasars: Individual: Rx J0953.9+4617, X-Rays: Galaxies

Scientific paper

An analysis is given of the AGN found in the medium deep X-ray survey in the HQS field HS 47.5/22 . The log N - log Si curve is in good agreement with values in the literature above fx =~ 3.4*10-14 ergs cm-2 s-1. 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 mb = 18fm3 - 18fm5 , resulting in a complete optical sample of not more than 18 AGN. X-ray completeness is primarily determined by the identification status. Below 2*10-13 ergs cm-2 s-1, 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. Partly based on observations from the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy

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