Characterizing Optical Variability of OJ 287 in 2016–2017
Gupta,Alok C.1,2; Gaur,Haritma1; Wiita,Paul J.3; Pandey,A.1; Kushwaha,P.4; Hu,S. M.5; Kurtanidze,O. M.6,7,8,9; Semkov,E.10; Damljanovic,G.11; Goyal,A.12; Uemura,M.13; Darriba,A.14,15; Chen,Xu5; Vince,O.11; Gu,M. F.2; Zhang,Z.16; Bachev,R.10; Chanishvili,R.6; Itoh,R.17; Kawabata,M.13; Kurtanidze,S. O.6; Nakaoka,T.13; Nikolashvili,M. G.6; Stawarz,?.12; Strigachev,A.10
Source PublicationThe Astronomical Journal
AbstractAbstract 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.
KeywordBL Lacertae objects: general BL Lacertae objects: individual (OJ 287) techniques: photometric techniques: polarimetric
WOS IDIOP:0004-6256-157-3-aafe7d
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital—263002, India;,
2.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China
3.Department of Physics, The College of New Jersey, 2000 Pennington Road, Ewing, NJ 08628-0718, USA;
4.Department of Astronomy (IAG-USP), University of Sao Paulo, Sao Paulo 05508-090, Brazil
5.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, People’s Republic of China
6.Abastumani Observatory, Mt. Kanobili, 0301 Abastumani, Georgia
7.Engelhardt Astronomical Observatory, Kazan Federal University, Tatarstan, Russia
8.Center for Astrophysics, Guangzhou University, Guangzhou 510006, People’s Republic of China
9.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
10.Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Tsarigradsko Shosse Boulevard, 1784 Sofia, Bulgaria
11.Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia
12.Astronomical Observatory of Jagiellonian University, ul. Orla 171, 30-244 Krakow, Poland
13.Hiroshima Astrophysical Science Center, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
14.American Association of Variable Star Observers (AAVSO), 49 Bay State Road, Cambridge, MA 02138, USA
15.Group M1, Centro Astronómico de Avila, Madrid, Spain
16.Shanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China
17.Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
Recommended Citation
GB/T 7714
Gupta,Alok C.,Gaur,Haritma,Wiita,Paul J.,等. 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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