Characterizing Optical Variability of OJ 287 in 2016–2017

doi:10.3847/1538-3881/aafe7d

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	Characterizing Optical Variability of OJ 287 in 2016–2017
	Gupta,Alok C.1,2; Gaur,Haritma 2; Wiita,Paul J.17; Pandey,A.2; Kushwaha,P.16; Hu,S. M.15; Kurtanidze,O. M.3,9,13,14; Semkov,E.8; Damljanovic,G.12; Goyal,A.11
刊名	The Astronomical Journal
	2019-02-05
卷号	157 期号:3
关键词	BL Lacertae objects: general BL Lacertae objects: individual (OJ 287) techniques: photometric techniques: polarimetric
ISSN号	0004-6256
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
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31931]
专题	中国科学院上海天文台
作者单位	1.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China 2.Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital—263002, India; acgupta30@gmail.com, harry.gaur31@gmail.com 3.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 4.American Association of Variable Star Observers (AAVSO), 49 Bay State Road, Cambridge, MA 02138, USA 5.Group M1, Centro Astronómico de Avila, Madrid, Spain 6.Shanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China 7.Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan 8.Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Tsarigradsko Shosse Boulevard, 1784 Sofia, Bulgaria 9.Center for Astrophysics, Guangzhou University, Guangzhou 510006, People’s Republic of China 10.Hiroshima Astrophysical Science Center, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
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).