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

被引：29

作者：

Gu, M. -F. ^{[1
,2
]}

Ai, Y. L. ^{[3
,4
]}

机构：

[1] Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China

[2] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[3] Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China

[4] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 528卷

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

galaxies: active; quasars: general; galaxies: photometry; DIGITAL SKY SURVEY; ACTIVE GALACTIC NUCLEI; LACERTAE OBJECT S5-0716+714; 7TH DATA RELEASE; NRAO PMN SURVEYS; BL-LACERTAE; S5 0716+714; SLOPE VARIABILITY; BLAZAR JETS; 1ST SURVEY;

D O I：

10.1051/0004-6361/201016280

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. 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. Aims. We investigate the frequency of the redder-when-brighter trend in flat-spectrum radio quasars (FSRQs). Methods. 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. Results. 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.

引用

页数：8

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