SIMBAD references

2011A&A...528A..95G - Astronomy and Astrophysics, volume 528A, 95-95 (2011/4-1)

The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region.

GU M.-F. and AI Y.L.

Abstract (from CDS):

Although a bluer-when-brighter trend is commonly observed in blazars, the opposite trend of redder-when-brighter has also been found in some blazars. We investigate the frequency of the redder-when-brighter trend in flat-spectrum radio quasars (FSRQs). We investigate the optical variability of 29 FSRQs in the SDSS Stripe 82 region using SDSS DR7 released multi-epoch data covering about nine years. We determined the spectral index by fitting a powerlaw to SDSS ugriz photometric data, and explored the relationship between the spectral index and source brightness. For all FSRQs studied, we detect variations in r band flux of overall amplitude between 0.24 mag and 3.46 mag in different sources. Fourteen of 29 FSRQs display a bluer-when-brighter trend. However, only one source exhibits a redder-when-brighter trend, which implies that this behavior is rare in our FSRQ sample. In this source, the thermal emission from the accretion disk may be responsible for the redder-when-brighter trend.

Abstract Copyright:

Journal keyword(s): galaxies: active - quasars: general - galaxies: photometry

Simbad objects: 50

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