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

Author

S. Zola, M. Valtonen, G. Bhatta, A. Goyal, B. Debski, A. Baran, J. Krzesinski, M. Siwak, S. Ciprini, A. Gopakumar, H. Jermak, K. Nilsson, D. Reichart, K. Matsumoto, K. Sadakane, K. Gazeas, M. Kidger, V. Piirola, F. Alicavus, K. S. Baliyan, A. Berdyugin, D. Boyd, M. Campas Torrent, F. Campos, J. Carrillo Gómez, D. B. Caton, V. Chavushyan, J. Dalessio, D. Dimitrov, M. Drozdz, H. Er, A. Erdem, A. Escartin Pérez, V. Fallah Ramazani, A. V. Filippenko, F. Garcia, F. Gómez Pinilla, M. Gopinathan, J. B. Haislip, J. Harmanen, R. Hudec, G. Hurst, K. M. Ivarsen, M. Jelinek, A. Joshi, M. Kagitani, N. Kaur, W. C. Keel, A. P. LaCluyze, B. C. Lee, E. Lindfors, J. Lozano de Haro, J. P. Moore, M. Mugrauer, R. Naves Nogues, A. W. Neely, R. H. Nelson, W. Ogloza, S. Okano, J. C. Pandey, M. Perri, P. Pihajoki, G. Poyner, J. Provencal, T. Pursimo, A. Raj, R. Reinthal, S. Sadegi, T. Sakanoi, Sameer, J.-L. Salto González, T. Schweyer, F. C. Soldán Alfaro, N. Karaman, E. Sonbas, I. Steele, J. T. Stocke, J. Strobl, L. O. Takalo, T. Tomov, L. Tremosa Espasa, J. R. Valdes, J. Valero Pérez, F. Verrecchia, J. R. Webb, M. Yoneda, M. Zejmo, W. Zheng, J. Telting, J. Saario, T. Reynolds, A. Kvammen, E. Gafton, R. Karjalainen, and P. Blay

Subjects
galaxies: active, BL Lacertae objects: individual (OJ287), supermassive black holes, Astronomy, QB1-991
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.

Published
2016
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2. Stochastic modeling of multiwavelength variability of the classical BL Lac object OJ 287 on timescales ranging from decades to hours

Author

A. Goyal, Ł. Stawarz, S. Zola, V. Marchenko, M. Soida, K. Nilsson, S. Ciprini, A. Baran, M. Ostrowski, P. J. Wiita, null Gopal-Krishna, A. Siemiginowska, M. Sobolewska, S. Jorstad, A. Marscher, M. F. Aller, H. D. Aller, T. Hovatta, D. B. Caton, D. Reichart, K. Matsumoto, K. Sadakane, K. Gazeas, M. Kidger, V. Piirola, H. Jermak, F. Alicavus, K. S. Baliyan, A. Baransky, A. Berdyugin, P. Blay, P. Boumis, D. Boyd, Y. Bufan, M. Campas Torrent, F. Campos, J. Carrillo Gómez, J. Dalessio, B. Debski, D. Dimitrov, M. Drozdz, H. Er, A. Erdem, A. Escartin Pérez, V. Fallah Ramazani, A. V. Filippenko, E. Gafton, F. Garcia, V. Godunova, F. Gómez Pinilla, M. Gopinathan, J. B. Haislip, S. Haque, J. Harmanen, R. Hudec, G. Hurst, K. M. Ivarsen, A. Joshi, M. Kagitani, N. Karaman, R. Karjalainen, N. Kaur, D. Kozieł-Wierzbowska, E. Kuligowska, T. Kundera, S. Kurowski, A. Kvammen, A. P. LaCluyze, B. C. Lee, A. Liakos, J. Lozano de Haro, J. P. Moore, M. Mugrauer, R. Naves Nogues, A. W. Neely, W. Ogloza, S. Okano, U. Pajdosz, J. C. Pandey, M. Perri, G. Poyner, J. Provencal, T. Pursimo, A. Raj, B. Rajkumar, R. Reinthal, T. Reynolds, J. Saario, S. Sadegi, T. Sakanoi, J. L. Salto González, null Sameer, A. O. Simon, M. Siwak, T. Schweyer, F. C. Soldán Alfaro, E. Sonbas, J. Strobl, L. O. Takalo, L. Tremosa Espasa, J. R. Valdes, V. V. Vasylenko, F. Verrecchia, J. R. Webb, M. Yoneda, M. Zejmo, W. Zheng, P. Zielinski, J. Janik, V. Chavushyan, I. Mohammed, C. C. Cheung, and M. Giroletti

Subjects
ACTIVE GALACTIC NUCLEI, Astrophysics::High Energy Astrophysical Phenomena, OJ-287, FOS: Physical sciences, Astrophysics, individual: OJ 287 [BL Lacertae objects], Type (model theory), Astronomy & Astrophysics, magnetic fields, 01 natural sciences, LARGE-AREA TELESCOPE, Radio telescope, PERIODICITIES, 0103 physical sciences, individual (OJ 287) [BL Lacertae objects], Blazar, 010303 astronomy & astrophysics, LACERTAE OBJECTS, acceleration of particles, MISSION, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Science & Technology, 010308 nuclear & particles physics, OPTICAL POLARIZATION, Spectral density, Astronomy and Astrophysics, Light curve, non-thermal [radiation mechanisms], BLAZARS, 13. Climate action, Space and Planetary Science, Colors of noise, Physical Sciences, active [galaxies], UNEQUALLY-SPACED DATA, Astrophysics - High Energy Astrophysical Phenomena, OJ 287, Noise (radio), BL Lac object
Abstract

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 $\gamma$-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 $\gamma$-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., Comment: ApJ accepted

Published
2017
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3. A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign

Author

T. M. Reynolds, J. H. Telting, Andrzej S. Baran, Daniel E. Reichart, Navpreet Kaur, Eda Sonbas, Stefano Ciprini, J. Lozano de Haro, T. Schweyer, Takeshi Sakanoi, WeiKang Zheng, Gary Poyner, Kiran S. Baliyan, Daniel B. Caton, Katsura Matsumoto, A. Escartin Pérez, A. W. Neely, J. Dalessio, Kozo Sadakane, Waldemar Ogloza, T. Pursimo, Jussi Harmanen, F. Garcia, V. H. Chavushyan, Byeong-Cheol Lee, Markus Mugrauer, B. Debski, S. Okano, Pauli Pihajoki, Kari Nilsson, Andrei Berdyugin, Andreas Kvammen, R. Naves Nogues, K. M. Ivarsen, H. Er, F. Alicavus, L. Tremosa Espasa, J. P. Moore, J. B. Haislip, Masato Kagitani, Elina Lindfors, L. O. Takalo, G. Hurst, R. Reinthal, V. Fallah Ramazani, Toma Tomov, Marek Drozdz, Kosmas Gazeas, Mauri Valtonen, Michal Siwak, John T. Stocke, J.-L. Salto González, William C. Keel, F. Campos, Arti Joshi, Pere Blay, J. Carrillo Gómez, J. R. Valdes, J. Valero Pérez, Iain A. Steele, Maheswar Gopinathan, M. Zejmo, Alexei V. Filippenko, M. R. Kidger, Gopal Bhatta, Dinko Dimitrov, Jan Strobl, Arti Goyal, Helen Jermak, Mizuki Yoneda, E. Gafton, F. Verrecchia, Stanisław Zoła, Judith L. Provencal, R. H. Nelson, M. Campas Torrent, J. Saario, Aaron P. LaCluyze, Vilppu Piirola, J. Krzesinski, James R. Webb, Ahmet Erdem, David Boyd, N. Karaman, F. Gómez Pinilla, Jeewan C. Pandey, A. Raj, Martin Jelínek, Achamveedu Gopakumar, René Hudec, F. C. Soldán Alfaro, S. Sadegi, M. Perri, R. Karjalainen, Sameer, and Department of Physics

Subjects
Physics, Supermassive black hole, ta115, 010504 meteorology & atmospheric sciences, Accretion (meteorology), lcsh:Astronomy, galaxies: active, supermassive black holes, Astronomy, Astronomy and Astrophysics, Astrophysics, Light curve, 115 Astronomy, Space science, 01 natural sciences, BL Lacertae objects: individual (OJ287), Black hole, lcsh:QB1-991, Innermost stable circular orbit, Spiral wave, 0103 physical sciences, Periodogram, Blazar, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences
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.

Published
2016

4. Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters

Author

Lankeswar Dey, M. J. Valtonen, A. Gopakumar, S. Zola, R. Hudec, P. Pihajoki, S. Ciprini, K. Matsumoto, K. Sadakane, M. Kidger, K. Nilsson, S. Mikkola, A. Sillanpää, L. O. Takalo, H. J. Lehto, A. Berdyugin, V. Piirola, H. Jermak, K. S. Baliyan, T. Pursimo, D. B. Caton, F. Alicavus, A. Baransky, P. Blay, P. Boumis, D. Boyd, M. Campas Torrent, F. Campos, J. Carrillo Gómez, S. Chandra, V. Chavushyan, J. Dalessio, B. Debski, M. Drozdz, H. Er, A. Erdem, A. Escartin Pérez, V. Fallah Ramazani, A. V. Filippenko, E. Gafton, S. Ganesh, F. Garcia, K. Gazeas, V. Godunova, F. Gómez Pinilla, M. Gopinathan, J. B. Haislip, J. Harmanen, G. Hurst, J. Janík, M. Jelinek, A. Joshi, M. Kagitani, R. Karjalainen, N. Kaur, W. C. Keel, V. V. Kouprianov, T. Kundera, S. Kurowski, A. Kvammen, A. P. LaCluyze, B. C. Lee, A. Liakos, E. Lindfors, J. Lozano de Haro, M. Mugrauer, R. Naves Nogues, A. W. Neely, R. H. Nelson, W. Ogloza, S. Okano, U. Pajdosz-Śmierciak, J. C. Pandey, M. Perri, G. Poyner, J. Provencal, A. Raj, D. E. Reichart, R. Reinthal, T. Reynolds, J. Saario, S. Sadegi, T. Sakanoi, J.-L. Salto González, null Sameer, T. Schweyer, A. Simon, M. Siwak, F. C. Soldán Alfaro, E. Sonbas, I. Steele, J. T. Stocke, J. Strobl, T. Tomov, L. Tremosa Espasa, J. R. Valdes, J. Valero Pérez, F. Verrecchia, V. Vasylenko, J. R. Webb, M. Yoneda, M. Zejmo, W. Zheng, P. Zielinski, and Department of Physics

Subjects
General relativity, Astrophysics::High Energy Astrophysical Phenomena, black hole physics, OJ-287, FOS: Physical sciences, GRAVITATIONAL-RADIATION REACTION, General Relativity and Quantum Cosmology (gr-qc), Astrophysics, individual: OJ 287 [quasars], OUTBURSTS, 01 natural sciences, General Relativity and Quantum Cosmology, law.invention, VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438, Binary black hole, MOMENTS, law, quasars: general, 0103 physical sciences, Blazar, 010303 astronomy & astrophysics, QC, QB, High Energy Astrophysical Phenomena (astro-ph.HE), Orbital elements, Physics, general [quasars], COMPACT BINARIES, OJ287, 010308 nuclear & particles physics, Gravitational wave, quasars: individual (OJ 287), SYSTEMS NONSPINNING BODIES, Astronomy and Astrophysics, 115 Astronomy, Space science, Orbital period, Astrophysics - Astrophysics of Galaxies, VDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438, MODEL, Black hole, SPIN, gravitation, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Astrophysics - High Energy Astrophysical Phenomena, WAVE-FORM, Flare
Abstract

Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the binary black hole central engine of blazar OJ 287 demand the inclusion of gravitational radiation reaction effects beyond the quadrupolar order. It turns out that even the effects of certain hereditary contributions to GW emission are required to predict impact flare timings of OJ 287. We develop an approach that incorporates this effect into the binary black hole model for OJ~287. This allows us to demonstrate an excellent agreement between the observed impact flare timings and those predicted from ten orbital cycles of the binary black hole central engine model. The deduced rate of orbital period decay is nine orders of magnitude higher than the observed rate in PSR 1913+16, demonstrating again the relativistic nature of OJ 287's central engine. Finally, we argue that precise timing of the predicted 2019 impact flare should allow a test of the celebrated black hole "no-hair theorem" at the 10% level., 24 pages, 11 figures, 3 tables, accepted for publication in ApJ

Published
2018

5. Search for QPOs in the Light Curve of the Blazar OJ287: Preliminary Results from 2015/16 Observing Campaign

Author

K. M. Ivarsen, Jussi Harmanen, John T. Stocke, Pere Blay, Pauli Pihajoki, Byeong-Cheol Lee, Dinko Dimitrov, F. Alicavus, J.-L. Salto Gonzales, F. Garcia, Arti Goyal, Waldemar Ogloza, Judith L. Provencal, J. H. Telting, Eda Sonbas, J. Carrillo Gómez, Elina Lindfors, Stefano Ciprini, Vilppu Piirola, Helen Jermak, J. Lozano de Haro, F. C. Soldán Alfaro, Andrei Berdyugin, T. Pursimo, R. Naves Nogues, Ahmet Erdem, Staszek Zola, R. Reinthal, S. Okano, Kiran S. Baliyan, B. Debski, J. R. Valdes, T. M. Reynolds, Gopal Bhatta, Takeshi Sakanoi, Michal Siwak, M. Campas Torrent, Andrzej S. Baran, Daniel E. Reichart, R. H. Nelson, V. Fallah Ramazani, A. Escartin Pérez, Mizuki Yoneda, J. Saario, E. Gafton, J. Valero Pérez, F. Campos, Kari Nilsson, L. Tremosa Espasa, Tassilo Schweyer, Maheswar Gopinathan, James R. Webb, Jan Strobl, Arti Joshi, G. Hurst, Toma Tomov, J. Dalessio, Kozo Sadakane, Daniel B. Caton, A. W. Neely, L. O. Takalo, J. Krzesinski, William C. Keel, V. H. Chavushyan, Mauri Valtonen, WeiKang Zheng, Gary Poyner, Katsura Matsumoto, Andreas Kvammen, M. Zejmo, Alexei V. Filippenko, Masato Kagitani, M. R. Kidger, Navpreet Kaur, J. P. Moore, Kosmas Gazeas, Marek Drozdz, Aaron P. LaCluyze, Iain A. Steele, F. Verrecchia, J. B. Haislip, David Boyd, N. Karaman, F. Gómez Pinilla, Jeewan C. Pandey, A. Raj, Martin Jelínek, Achamveedu Gopakumar, S. Sadegi, Sameer, M. Perri, and R. Karjalainen

Subjects
Physics, Supermassive black hole, Accretion (meteorology), Alias, 010308 nuclear & particles physics, Astronomy, Astrophysics, Light curve, 01 natural sciences, astronomy_astrophysics, Frequency domain, 0103 physical sciences, Time domain, Blazar, 010303 astronomy & astrophysics, BL Lac object
Abstract

We analyse the light curve in the R-band gathered during the 2015/16 observing season of OJ287. We did a search for QPOs using several methods in wide time domain. No statistically significant periods were found in the high frequency domain both in the ground data and also in K2 observations. In the longer periods domain the Lomb-Scargle periodogram revealed several peaks above the 99\% significance level. The longest one, about 95-day, corresponds to the ISCO period of the more massive SMBH. The 43-day period could be an alias or can be attributed to accretion in the form of two armed spiral wave.

Published
2016

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