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The optical variability of radio-loud quasars

Published online by Cambridge University Press:  21 February 2013

Minfeng Gu  and
Y. L. Ai
Minfeng Gu
Affiliation:
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, 200030 Shanghai, PR China email: gumf@shao.ac.cn
Y. L. Ai
Affiliation:
National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, Yunnan, PR China
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Abstract

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The optical variability of a sample of 44 FSRQs and 18 SSRQs in the SDSS stripe 82 region is investigated by using the multi-epoch data covering nine years. The variabilities are clearly detected in each source with the amplitude in r band, from 0.18 to 3.46 mag. Twenty-five of 44 FSRQs show a bluer-when-brighter trend (BWB), while only one FSRQ shows a redder-when-brighter trend, which is in contrast to our previous results. Eight of 18 SSRQs display a BWB. We found an anti-correlation between the Eddington ratio and the variability amplitude in r band for SSRQs, which is similar to that in radio-quiet AGNs. This implies that the thermal emission from the accretion disk may be responsible for the variability in SSRQs.

Keywords

Galaxies: activequasars: generalgalaxies: photometry

References

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Gu, M. F. & Ai, Y. L. 2011a, A&A, 528, A95Google Scholar
Gu, M. F. & Ai, Y. L. 2011b, A&A, 534, A59Google Scholar
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