Stochastic modeling of multiwavelength variability of the classical BL Lac object OJ 287 on timescales ranging from decades to hours
Creators: name: Goyal, A.
name: Stawarz, L.
name: Zola, S.
name: Marchenko, V.
name: Soida, M.
name: Nilsson, K.
name: Ciprini, S.
name: Baran, A.
name: Ostrowski, M.
name: Wiita, P. J.
name: Gopal-Krishna
name: Siemiginowska, A.
name: Sobolewska, M.
name: Jorstad, S.
name: Marscher, A.
name: Hovatta, M. F. Aller H. D. Aller T.
name: Caton, D. B.
name: Reichart, D.
name: Matsumoto, K.
name: Sadakane, K.
name: Gazeas, K.
name: Kidger, M.
name: Piirola, V.
name: Jermak, H.
name: Alicavus, F.
name: Baliyan, K. S.
name: Baransky, A.
name: Berdyugin, A.
name: Blay, P.
name: Boumis, P.
name: Boyd, D.
name: Bufan, Y.
name: Torrent, M. Campas
name: Campos, F.
name: Gomez, J. Carrillo
name: Dalessio, J.
name: Debski, B.
name: Dimitrov, D.
name: Drozdz, M.
name: Er, H.
name: Erdem, A.
name: Perez, A. Escartin
name: Ramazani, V. Fallah
name: Filippenko, A. V.
name: Gafton, E.
name: Garcia, F.
name: Godunova, V.
name: Pinilla, F. Gomez
name: Gopinathan, M.
name: Haislip, J. B.
name: Haque, S.
name: Harmanen, J.
name: Hudec, R.
name: Hurst, G.
name: Ivarsen, K. M.
name: Joshi, A.
name: Kagitani, M.
name: Karaman, N.
name: Karjalainen, R.
name: Kaur, N.
name: l-Wierzbowska, D. Kozie
name: Kuligowska, E.
name: Kundera, T.
name: Kurowski, S.
name: Kvammen, A.
name: LaCluyze, A. P.
name: Lee, B. C.
name: Liakos, A.
name: de Haro, J. Lozano
name: Mohammed, I.
name: Moore, J. P.
name: Mugrauer, M.
name: Nogues, R. Naves
name: Neely, A. W.
name: Ogloza, W.
name: Okano, S.
name: Pajdosz, U.
name: Pandey, J. C.
name: Perri, M.
name: Poyner, G.
name: Provencal, J.
name: Pursimo, T.
name: Raj, A.
name: Rajkumar, B.
name: Reinthal, R.
name: Reynolds, T.
name: Saario, J.
name: Sadegi, S.
name: Sakanoi, T.
name: Gonzalez, J. L. Salto
name: Sameer
name: Heung, A.
name: Simon, O.
name: Siwak, M.
name: Schweyer, T.
name: Alfaro, F. C. Soldan
name: Sonbas, E.
name: Strobl, J.
name: Takalo, L. O.
name: Espasa, L. Tremosa
name: Valdes, J. R.
name: Vasylenko, V. V.
name: Verrecchia, F.
name: Webb, J. R.
name: Yoneda, M.
name: Zejmo, M.
name: Zheng, W.
name: Zielinski, P.
name: Janik, J.
name: Chavushyan, V.
name: Cheung, C. C.
name: Giroletti, M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present the results of our power spectral density analysis for the BL Lac object OJ\,287, utilizing the {\it Fermi}-LAT survey at high-energy $γ$-rays, {\it Swift}-XRT in X-rays, several ground-based telescopes and the {\it Kepler} satellite in the optical, and radio telescopes at GHz frequencies. The light curves are modeled in terms of continuous-time auto-regressive moving average (CARMA) processes. Owing to the inclusion of the {\it Kepler} data, we were able to construct \emph{for the first time} the optical variability power spectrum of a blazar without any gaps across $\sim6$ 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 {\it Fermi}-LAT data, corresponding to $\sim 150$\,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.
description: ApJ accepted