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Open AccessFeature PaperArticle

Intra-Night Variability of OJ 287 with Long-Term Multiband Optical Monitoring

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Department of Physics, Yunnan University, Kunming 650091, China
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Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University, Kunming 650091, China
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Department of Physics and Technology, Kunming College, Kunming 650214, China
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Department of Astronomy, Yunnan University, Kunming 650091, China
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Author to whom correspondence should be addressed.
Galaxies 2017, 5(4), 85; https://doi.org/10.3390/galaxies5040085
Received: 28 October 2017 / Revised: 17 November 2017 / Accepted: 20 November 2017 / Published: 22 November 2017
(This article belongs to the Special Issue Microvariability of Blazars)
We present long-term optical multi-band photometric monitoring of the blazar OJ 287 from 6 March 2010 to 3 April 2016, with high temporal resolution in the V R I -bands. The flux variations and colour-magnitude variations on long and short timescales were investigated to understand the emission mechanisms. In our observation, the major outbursts occurred in January 2016, as predicted by the binary pair of black holes model for OJ 287, with F v a r of 1.3∼2.1%, and variability amplitude (Amp) of 5.8∼9.0%. The intra-night variability (IDV) durations were from 18.5 to 51.3 min, and the minimal variability timescale was about 4.7 min. The colour-magnitude variation showed a weak positive correlation on the long timescale with Pearson’s r = 0 . 450 , while a negative correlation was found on intra-night timescales. We briefly discuss the possible physical mechanisms that are most likely to be responsible for the observed flux and colour-magnitude correlation variability. View Full-Text
Keywords: BL Lacertae objects: general; quasar: individual: OJ 287; galaxies: photometry BL Lacertae objects: general; quasar: individual: OJ 287; galaxies: photometry
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Zeng, W.; Zhao, Q.-J.; Jiang, Z.-J.; Kong, Z.-H.; Liu, Z.; Wang, D.-D.; Geng, X.-F.; Yang, S.-B.; Dai, B.-Z. Intra-Night Variability of OJ 287 with Long-Term Multiband Optical Monitoring. Galaxies 2017, 5, 85.

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