Are all QSOs long-period variables?

Details Are all QSOs long-period variables? Are all QSOs long-period variables?

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..255d&link_type=abstract

In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc

Astronomy and Astrophysics

Astrophysics

Astronomical Spectroscopy, Periodic Variations, Photographic Measurement, Quasars, Red Shift, Seyfert Galaxies, Active Galactic Nuclei, Autocorrelation, Luminosity, Ultraviolet Radiation

Scientific paper

We present results of long-term photographic monitoring of a single southern Schmidt field. In this field we find that faint, long term variable objects are found at a space density of 55 per square degree, close to the canonical space density of QSOs. Subsequent spectroscopic observation of 65 of these has shown that over 85 percent of these are QSOs at intermediate redshifts. Correcting for time dilation effects, the characteristic timescale of variability found from autocorrelation techniques varies from 0.7 to 5 years, however, the upper limit is determined more by the limited period of observation. The QSOs show little evidence of a period-luminosity relation. However, when our results are combined with data on lower-luminosity Seyfert Galaxies, evidence of such a relation emerges.

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