Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-dependent Spectral Behavior
文献类型：期刊论文
| 作者 | Feng,Hai-Cheng1,2,4; Yang,Sen.4,5; Yang,Zi-Xu.4,5; Liu,H. T.1,2,3; Bai,J. M.1,2,3; Li,Sha-Sha.4,5; Zhao,X. H.1,2,3; Zhang,Jin.6; Li,Y. B.1,2,4; Xiao,M.5 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 902期号:1 |
| 关键词 | Active galactic nuclei BL Lacertae objects Blazars Relativistic jets Spectroscopy |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abb366 |
| 英文摘要 | Abstract In this paper, we report new results of spectroscopic observations of γ-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4 m optical telescope at Lijiang Observatory of Yunnan Observatories. The median cadence of observations is ～1 day. During the second observation period (Epoch2), the observational data reveal an extremely bright state and a bluer-when-brighter (BWB) chromatism. The BWB trend of Epoch2 differs significantly from that of the first observation period (Epoch1). A significantly brightness-dependent BWB chromatism emerges in the total data of Epoch1 and Epoch2. The BWB trend becomes weaker toward the brighter states, and likely becomes saturated at the highest state. Based on a log-parabolic function, a power law of synchrotron peak flux and frequency νp, and a power law of the curvature of synchrotron spectrum and its νp, simulation well reproduces the brightness-dependent BWB trend of S5 0716+714. The BWB trend is seemingly controlled by the shift of νp with respect to the observational window, and effectively may be dominated by the variations of electron average energy and magnetic field in the emitting region. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-902-1-ABB366 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/62003]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Feng,Hai-Cheng |
| 作者单位 | 1.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, Yunnan, People’s Republic of China 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, Yunnan, People’s Republic of China; hcfeng@ynao.ac.cn, htliu@ynao.ac.cn, baijinming@ynao.ac.cn 3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China 4.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 5.Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, People’s Republic of China 6.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Feng,Hai-Cheng,Yang,Sen.,Yang,Zi-Xu.,et al. Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-dependent Spectral Behavior[J]. The Astrophysical Journal,2020,902(1). |
| APA | Feng,Hai-Cheng.,Yang,Sen..,Yang,Zi-Xu..,Liu,H. T..,Bai,J. M..,...&He,S. S..(2020).Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-dependent Spectral Behavior.The Astrophysical Journal,902(1). |
| MLA | Feng,Hai-Cheng,et al."Spectroscopic Monitoring of Blazar S5 0716+714: Brightness-dependent Spectral Behavior".The Astrophysical Journal 902.1(2020). |
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来源：国家天文台
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