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Properties of a QSO Sample Selected Through Variability

Published online by Cambridge University Press:  07 August 2017

D. Trevese ,
D. C. Koo  and
R. G. Kron
D. Trevese
Affiliation:
Istituto Astronomico, Universita di Roma “La Sapienza”, Via G. M. Lancisi, 29, 000161, Roma, Italy
D. C. Koo
Affiliation:
Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 U.S.A.
R. G. Kron
Affiliation:
Yerkes Observatory, University of Chicago, Williams Bay, WI 53191 U.S.A.

Extract

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Variability of QSOs serves not only as an independent search technique but also as another parameter to correlate with such properties as luminosity (in radio, optical, X-ray), redshift, spectral features, color, etc., so as to better understand AGNs. We present some preliminary results on a variability study of an essentially complete sample using 4 m prime focus plates of a 0.3 deg2 field at the North Galactic Pole (SA57). The faintness of our survey, B ≈ 23; the precision of the measurements (σ ≤ 0.05 mag); and the availability of redshifts for many of the candidates provide an opportunity to study QSO variability in regimes previously unexplored (c.f. Bonoli et al. 1979 or Hawkins 1986).

Type
Part 1: Surveys, Luminosity Functions, and Evolution
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 47 - 48
Copyright
Copyright © Kluwer 1989 

References

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