The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region
文献类型：期刊论文
| 作者 | Gu, MF1,2; Ai YL(艾艳丽)3,4
|
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2011-04 |
| 卷号 | 528 |
| 关键词 | galaxies: active quasars: general galaxies: photometry |
| ISSN号 | 0004-6361 |
| 产权排序 | 第三完成单位 |
| 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. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2011/04/aa16280-10/aa16280-10.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000288541600051 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5013]  |
| 专题 | 云南天文台_高能天体物理研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 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. The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region[J]. ASTRONOMY & ASTROPHYSICS,2011,528. |
| APA | Gu, MF,&Ai YL.(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). |
入库方式： OAI收割
来源：云南天文台
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