Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..377b&link_type=abstract
In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 377-382 (SEE
Astronomy and Astrophysics
Astronomy
1
Active Galactic Nuclei, Data Bases, Red Shift, Rosat Mission, Seyfert Galaxies, Sky Surveys (Astronomy), X Ray Astronomy, X Ray Sources, Identifying, Luminous Intensity, Positioning, Statistical Analysis
Scientific paper
An identification process which provides positions and their errors for x-ray sources is outlined. 2500 sources have been examined from the Rosat all sky survey on objective prism plates which were taken in the course of the Hamburg Quasar Survey (HQS). Among other object classes more than 700 Active Galactic Nuclei (AGN) candidates were identified. In a first follow up observing run in May 1991, 43 AGN candidates were spectroscopically observed of which 41 were confirmed, that is a success of rate of 90 percent. The redshift and the log(fx/fv) distribution of the 41 AGN are, within the statistical uncertainties, similar to the distributions from the Einstein medium sensitivity survey. Six of the 43 AGN candidates are members of pairs or small groups of galaxies. Three of them have only narrow emission lines, one certainly being a narrow lined Seyfert 1 galaxy. The nature of the high x-ray luminosities of the other two sources is uncertain at present. Details of the compilation of a database in which all objects found in the Schmidt plates within the error circle of each examined Rosat detection are collected, and where an identification of the most likely candidate is given is described.
Bade Norbert
Dahlem Michael
Engels Dieter
Reimers Dieter
Voges Wolfgang
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