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A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign

Citation:

Zola S, Valtonen M, Bhatta G, Goyal A, Debski B, Baran A, Krzesinski J, Siwak M, Ciprini S, Gopakumar A, et al. A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign. [Internet]. 2016;4:41.

Abstract:

We analyse the light curve in the R band of the blazar OJ287, gathered during the 2015/2016 observing season. We did a search for quasi-periodic oscillations (QPOs) using several methods over a wide range of timescales. No statistically significant periods were found in the high-frequency domain both in the ground-based data and in Kepler observations. In the longer-period domain, the Lomb-Scargle periodogram revealed several peaks above the 99% significance level. The longest one—about 95 days—corresponds to the innermost stable circular orbit (ISCO) period of the more massive black hole. The 43-day period could be an alias, or it can be attributed to accretion in the form of a two-armed spiral wave.

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