@article{3069179,
    title = "Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ 287 on Timescales Ranging from Decades to Hours",
    author = "Goyal, A. and Stawarz, Ł. and Zola, S. and Marchenko, V. and Soida, M. and Nilsson, K. and Ciprini, S. and Baran, A. and Ostrowski, M. and Wiita, P.J. and Gopal-Krishna and Siemiginowska, A. and Sobolewska, M. and Jorstad, S. and Marscher, A. and Aller, M.F. and Aller, H.D. and Hovatta, T. and Caton, D.B. and Reichart, D. and Matsumoto, K. and Sadakane, K. and Gazeas, K. and Kidger, M. and Piirola, V. and Jermak, H. and Alicavus, F. and Baliyan, K.S. and Baransky, A. and Berdyugin, A. and Blay, P. and Boumis, P. and Boyd, D. and Bufan, Y. and Torrent, M.C. and Campos, F. and Gómez, J.C. and Dalessio, J. and Debski, B. and Dimitrov, D. and Drozdz, M. and Er, H. and Erdem, A. and Pérez, A.E. and Ramazani, V.F. and Filippenko, A.V. and Gafton, E. and Garcia, F. and Godunova, V. and Pinilla, F.G. and Gopinathan, M. and Haislip, J.B. and Haque, S. and Harmanen, J. and Hudec, R. and Hurst, G. and Ivarsen, K.M. and Joshi, A. and Kagitani, M. and Karaman, N. and Karjalainen, R. and Kaur, N. and Kozieł-Wierzbowska, D. and Kuligowska, E. and Kundera, T. and Kurowski, S. and Kvammen, A. and Lacluyze, A.P. and Lee, B.C. and Liakos, A. and Haro, J.L.D. and Moore, J.P. and Mugrauer, M. and Nogues, R.N. and Neely, A.W. and Ogloza, W. and Okano, S. and Pajdosz, U. and Pandey, J.C. and Perri, M. and Poyner, G. and Provencal, J. and Pursimo, T. and Raj, A. and Rajkumar, B. and Reinthal, R. and Reynolds, T. and Saario, J. and Sadegi, S. and Sakanoi, T. and González, J.L.S. and Sameer and Simon, A.O. and Siwak, M. and Schweyer, T. and Alfaro, F.C.S. and Sonbas, E. and Strobl, J. and Takalo, L.O. and Espasa, L.T. and Valdes, J.R. and Vasylenko, V.V. and Verrecchia, F. and Webb, J.R. and Yoneda, M. and Zejmo, M. and Zheng, W. and Zielinski, P. and Janik, J. and Chavushyan, V. and Mohammed, I. and Cheung, C.C. and Giroletti, M.",
    journal = "ASTROPHYSICAL JOURNAL",
    year = "2018",
    volume = "863",
    number = "2",
    publisher = "INSTITUTE OF PHYSICS PUBLISHING",
    issn = "0004-637X",
    doi = "10.3847/1538-4357/aad2de",
    abstract = "We present the results of our power spectral density analysis for the BL Lac object OJ 287, utilizing the Fermi-LAT survey at high-energy γ-rays, Swift-XRT in X-rays, several ground-based telescopes and the Kepler satellite in the optical, and radio telescopes at GHz frequencies. The light curves are modeled in terms of continuous-time autoregressive moving average (CARMA) processes. Owing to the inclusion of the Kepler data, we were able to construct for the first time the optical variability power spectrum of a blazar without any gaps across ∼6 dex in temporal frequencies. Our analysis reveals that the radio power spectra are of a colored-noise type on timescales ranging from tens of years down to months, with no evidence for breaks or other spectral features. The overall optical power spectrum is also consistent with a colored noise on the variability timescales ranging from 117 years down to hours, with no hints of any quasi-periodic oscillations. The X-ray power spectrum resembles the radio and optical power spectra on the analogous timescales ranging from tens of years down to months. Finally, the γ-ray power spectrum is noticeably different from the radio, optical, and X-ray power spectra of the source: we have detected a characteristic relaxation timescale in the Fermi-LAT data, corresponding to ∼150 days, such that on timescales longer than this, the power spectrum is consistent with uncorrelated (white) noise, while on shorter variability timescales there is correlated (colored) noise. © 2018. The American Astronomical Society. All rights reserved.."
}