Selection of faint quasars based on variability

Details Selection of faint quasars based on variability Selection of faint quasars based on variability

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..387c&link_type=abstract

In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 387-391 (SEE

Astronomy and Astrophysics

Astronomy

1

Astronomical Photometry, Background Radiation, Cosmic X Rays, Quasars, Photographic Plates, Ultraviolet Radiation, Variability

Scientific paper

The optical variability of a quasar sample complete to BJ = 22.0 was investigated in a 2 year time base and in three photometric bands (UJF). The percentage of variable quasars is high and it reaches about 50 percent of the sample. The results also indicate that 80 to 90 percent of the selected variable objects out of the total 3000 objects of the whole field, are confirmed quasars or objects with strong ultraviolet excesses. It was concluded that optical variability can be successfully used as an efficient and independent (or auxiliary) selection method in quasar surveys in order to obtain faint and complete samples useful to place strong constraints to the x-ray cosmic background.

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