Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7355
Title: Multiwavelength variability of the classical BL Lac object OJ287 on timescales ranging from decades to hours
Authors: Goyal, A
Stawarz, L
Zola, S
Marchenko, V
Soida, M
Nilsson, K
Ciprini, S
Baran, A
Ostrowski, M
Wiita, P. J
Gopal-Krishna
Siemiginowska, A.
Sobolewska, M
Jorstad, S
Marscher, A
Aller, M. F.
Aller, H. D
Hovatta, T
Caton, D. B
Reichart, D
Matsumoto, K
Sadakane, K
Gazeas, K
Kidger, M
Piirola, V
Jermak, H
Alicavus, F
Baliyan, K. S
Baransky, A
Berdyugin, A
Blay, P
Boumis, P
Boyd, D
Bufan, Y
Campas Torrent, M
Campos, F
Carrillo Gómez, J
Dalessio, J
Debski, B
Dimitrov, D
Drozdz, M
Er, H
Erdem, A
Escartin Pérez, A
Fallah Ramazani, V
Filippenko, A. V
Gafton, E
Garcia, F
Godunova, V
Gómez Pinilla, F
Maheswar, G
Haislip, J. B
Haque, S
Harmanen, J
Hudec, R
Hurst, G
Ivarsen, K. M
Joshi, A
Kagitani, M
Karaman, N
Karjalainen, R
Kaur, N
Kozieł-Wierzbowska, D
Kuligowska, E
Kundera, T
Kurowski, S
Kvammen, A
LaCluyze, A. P
Lee, B. C
Liakos, A
Lozano de Haro, J
Moore, J. P
Mugrauer, M
Naves Nogues, R
Neely, A. W
Ogloza, W
Okano, S
Pajdosz, U
Pandey, J. C
Perri, M
Poyner, G
Provencal, J
Pursimo, T
Raj, A
and 29 co-authors
Keywords: Acceleration of particles – BL Lacertae objects;Individual (OJ 287) – galaxies;Active – magnetic fields – radiation mechanisms;Non-thermal
Issue Date: 20-Aug-2018
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 863, No. 2, 175
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.
Description: Restricted Access
URI: http://hdl.handle.net/2248/7355
ISSN: 0004-637X
???metadata.dc.rights???: © The American Astronomical Society
???metadata.dc.relation.uri???: https://doi.org/10.3847/1538-4357/aad2de
Appears in Collections:IIAP Publications



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