Characterizing Optical Variability of OJ 287 in 2016–2017
文献类型：期刊论文
| 作者 | Gupta,Alok C.14,15; Gaur,Haritma14; Wiita,Paul J.16; Pandey,A.14; Kushwaha,P.17; Hu,S. M.1; Kurtanidze,O. M.4,5,6,7; Semkov,E.8; Damljanovic,G.9; Goyal,A.10 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2019-02-05 |
| 卷号 | 157期号:3 |
| ISSN号 | 0004-6256 |
| 关键词 | BL Lacertae objects: general BL Lacertae objects: individual (OJ 287) techniques: photometric techniques: polarimetric |
| DOI | 10.3847/1538-3881/aafe7d |
| 英文摘要 | Abstract We report on a recent multiband optical photometric and polarimetric observational campaign of the blazar OJ 287 that was carried out during 2016 September–2017 December. We employed nine telescopes in Bulgaria, China, Georgia, Japan, Serbia, Spain, and the United States. We collected over 1800 photometric image frames in BVRI bands and over 100 polarimetric measurements over ～175 nights. In 11 nights with many quasi-simultaneous multiband (V, R, I) observations, we did not detect any genuine intraday variability in flux or color. On longer timescales, multiple flaring events were seen. Large changes in color with respect to time and in a color–magnitude diagram were seen, and while only a weak systematic variability trend was noticed in color with respect to time, the color–magnitude diagram shows a bluer-when-brighter trend. Large changes in the degree of polarization and substantial swings in the polarization angle were detected. The fractional Stokes parameters of the polarization showed a systematic trend with time in the beginning of these observations, followed by chaotic changes and then an apparently systematic variation at the end. These polarization changes coincide with the detection and duration of the source at very high energies as seen by VERITAS. The spectral index shows a systematic variation with time and V-band magnitude. We briefly discuss possible physical mechanisms that could explain the observed flux, color, polarization, and spectral variability. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-6256-157-3-AAFE7D |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/35466]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, People’s Republic of China 2.Shanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China 3.Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan 4.Abastumani Observatory, Mt. Kanobili, 0301 Abastumani, Georgia 5.Engelhardt Astronomical Observatory, Kazan Federal University, Tatarstan, Russia 6.Center for Astrophysics, Guangzhou University, Guangzhou 510006, People’s Republic of China 7.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 8.Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Tsarigradsko Shosse Boulevard, 1784 Sofia, Bulgaria 9.Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia 10.Astronomical Observatory of Jagiellonian University, ul. Orla 171, 30-244 Krakow, Poland |
| 推荐引用方式 GB/T 7714 | Gupta,Alok C.,Gaur,Haritma,Wiita,Paul J.,et al. Characterizing Optical Variability of OJ 287 in 2016–2017[J]. The Astronomical Journal,2019,157(3). |
| APA | Gupta,Alok C..,Gaur,Haritma.,Wiita,Paul J..,Pandey,A..,Kushwaha,P..,...&Strigachev,A..(2019).Characterizing Optical Variability of OJ 287 in 2016–2017.The Astronomical Journal,157(3). |
| MLA | Gupta,Alok C.,et al."Characterizing Optical Variability of OJ 287 in 2016–2017".The Astronomical Journal 157.3(2019). |
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来源：国家天文台
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