NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-20 T23:19:44 PDT
Help | Comment | NED Home

For refcode 2000AJ....119.2540G:
Retrieve 623 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2000AJ....119.2540G THE ASIAGO-ESO/RASS QSO SURVEY. I. THE CATALOG AND THE LOCAL QSO LUMINOSITY FUNCTION A. GRAZIAN Department of Astronomy, University of Padua, I-35122 Padua, Italy S. CRISTIANI European Southern Observatory, Space Telescope European Coordinating Facility, Karl-Schwarzschild-Strasse 2, Garching bei Munchen, D-85748 Germany V. D'ODORICO International School for Advanced Studies, Astrophysics Sector, via Beirut 4, Trieste, I-34013 Italy A. OMIZZOLO Vatican Observatory Research Group, Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 AND A. PIZZELLA European Southern Observatory, St. Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile and Department of Astronomy, University of Padua, I-35122 Padua, Italy Received 1999 November 12; accepted 2000 February 16 ABSTRACT This paper presents the first results of a survey for bright quasars (V < 14.5 and R < 15.4) covering the northern hemisphere at Galactic latitudes |b| > 30^deg^. The photometric database is derived from the Guide Star and USNO catalogs. Quasars are identified on the basis of their X-ray emission measured in the ROSAT All-Sky Survey. The surface density of quasars brighter than 15.5 mag turns out to be (10 +/- 2) x 10^-3^ deg^-2^, about 3 times higher than that estimated by the PG survey. The quasar optical luminosity function (LF) at 0.04 < z <= 0.3 is computed and shown to be consistent with a luminosity-dependent luminosity evolution of the type derived by La Franca & Cristiani in the range 0.3 < z <= 2.2. The predictions of semianalytical models of hierarchical structure formation agree remarkably well with the present observations. Key word: galaxies: clusters: general
Retrieve 623 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home