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

doi:10.1051/0004-6361/201016280

YNAO OpenIR > 高能天体物理研究组

	The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region
	Gu, MF 1,2; Ai YL(艾艳丽)3,4 ; Gu, MF (reprint author), Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China.
发表期刊	ASTRONOMY & ASTROPHYSICS
	2011-04
卷号	528
DOI	10.1051/0004-6361/201016280
产权排序	第3完成单位
收录类别	SCI
关键词	Galaxies: Active Quasars: General Galaxies: Photometry
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.
项目资助者	National Science Foundation of China [10703009, 10821302, 10833002, 10978009, 11033007, 11073039] ; 973 Program [2009CB824800] ; Alfred P. Sloan Foundation ; National Science Foundation ; US Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6361
URL	查看原文
WOS记录号	WOS:000288541600051
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	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
引用统计	被引频次：25[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5013
专题	高能天体物理研究组中国科学院天体结构与演化重点实验室
通讯作者	Gu, MF (reprint author), Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China.
作者单位	1.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, 200030 Shanghai PR China 2.Department of Physics, University of California, Santa Barbara, CA 93106, USA 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, Yunnan, PR China 4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, Yunnan, PR China
推荐引用方式 GB/T 7714	Gu, MF,Ai YL,Gu, MF . The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region[J]. ASTRONOMY & ASTROPHYSICS,2011,528.
APA	Gu, MF,Ai YL,&Gu, MF .(2011).The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region.ASTRONOMY & ASTROPHYSICS,528.
MLA	Gu, MF,et al."The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region".ASTRONOMY & ASTROPHYSICS 528(2011).

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