Abstract
We examined the behaviour of blazar OJ 287 based on 12 year observation data in optic, UV, X-ray, and gamma ray. The optical, UV, and X-ray data of OJ 287 were obtained from Swift archive, which provide more or less simultaneous optical–X-ray observations, while gamma ray data were obtained from Fermi archive. The occurrence of outburst episode in 2007 can be confirmed in Swift/UVOT data. In addition, episodes of significant brightening (possibly the outburst(s) of this decade) can also be seen in 2015–2016 and 2016–2017. Long-term flux variability in gamma ray and X-ray data is not always concurrent with those of optical and UV. Interestingly, the high peaks appeared almost simultaneous in optic, UV and X-ray in the episode of brightening in 2016–2017. X-ray spectral fittings show that non-thermal process predominates most of the X-ray spectra. Simultaneous optical–X-ray spectral fittings show the spectral evolution and suggest the combination of thermal and non-thermal component before brightening episode in 2015–2016. We obtained gamma ray spectra with broader peak at rather high frequency compared to that expected from simple synchrotron self-Compton mechanism. During brightening 2016–2017, the optical–X-ray fluxes are higher compared to those other periods. The shape of the X-ray and gamma ray spectra also have inverted trend than those of other periods.
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Acknowledgements
This work is supported by P3MI 2017 ITB Research Grant (KV, SF). This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester and the Fermi Science Support Center.
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Fatima, S., Anam, P.M.K. & Vierdayanti, K. A long hard look on multiwavelength properties of blazar OJ 287. Astrophys Space Sci 366, 37 (2021). https://doi.org/10.1007/s10509-021-03944-4
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DOI: https://doi.org/10.1007/s10509-021-03944-4