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Galaxies 2016, 4(4), 41; doi:10.3390/galaxies4040041

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

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Astronomical Observatory, Jagiellonian University, ul. Orla 171, Krakow 30-244, Poland
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Mt. Suhora Observatory, Pedagogical University, ul. Podchorazych 2, Krakow 30-084, Poland
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Finnish Centre for Astronomy with ESO, University of Turku, Turku F-21500, Finland
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Tuorla Observatory, Department of Physics and Astronomy, University of Turku, Turku F-21500, Finland
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Agenzia Spaziale Italiana (ASI) Science Data Center, Roma I-00133, Italy
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Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Perugia I-06123, Italy
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Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai 400005, India
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Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, Brownlow Hill L3 5RF, UK
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Departmentof Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA
10
Astronomical Institute, Osaka Kyoiku University, 4-698 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
11
Department of Astrophysics, Astronomy and Mechanics, National & Kapodistrian University of Athens, Zografos GR-15784, Athens, Greece
12
Herschel Science Centre, ESAC, European Space Agency, C/Bajo el Castillo, s/n, Villanueva de la Cañada, Madrid E-28692, Spain
13
Department of Physics, Faculty of Arts and Sciences, Canakkale Onsekiz Mart University, Canakkale TR-17100, Turkey
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Astrophysics Research Center and Ulupinar Observatory, Canakkale Onsekiz Mart University, Canakkale TR-17100, Turkey
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Physical Research Laboratory, Ahmedabad 380009, India
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5, Silver Lane, West Challow, Wantage, Oxon OX12 9TX, UK
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C/Jaume Balmes No 24, Cabrils, Barcelona E-08348, Spain
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C/.Riera, 1, 1o 3a B, Vallirana, Barcelona E-08759, Spain
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Carretera de Martos 28 primero Fuensanta, Jaen E-23001, Spain
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Dark Sky Observatory, Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USA
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Instituto Nacional de Astrofisica, Óptica y Electrónica, Apartado Postal 51-216, Puebla 72000, Mexico
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Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
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Institute of Astronomy and NAO, Bulgarian Academy of Science, 72 Tsarigradsko Chaussee Blvd., Sofia 1784, Bulgaria
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Department of Physics, Faculty of Science, Atatürk University, Erzurum 25240, Turkey
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Aritz Bidea No 8 4 B, Mungia, Bizkaia E-48100, Spain
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Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA
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Muñas de Arriba La Vara, Valdés E-33780, Spain
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C/Concejo de Teverga 9, 1 C, Madrid E-28053, Spain
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Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263002, India
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Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA
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Astronomical Institute, The Czech Academy of Sciences, Ondřejov 25165, Czech Republic
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Faculty of Electrical Engineering, Czech Technical University, Prague 74864, Czech Republic
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16 Westminster Close, Basingstoke, Hampshire RG22 4PP, UK
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Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263002, India
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Planetary Plasma and Atmospheric Research Center, Tohoku University, Sendai 980-8578, Japan
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Department of Physics and Astronomy and SARA Observatory, University of Alabama, Box 870324, Tuscaloosa, AL 35487, USA
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Korea Astronomy and Space Science Institute, 776, Daedeokdae-Ro, Youseong-Gu, Daejeon 305-348, Korea
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Partida de Maitino, Pol. 2 Num. 163, Elche E-03206, Spain
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Astrophysikalisches Institut und Universitäts-Sternwarte, Schillergäßchen 2-3, Jena D-07745, Germany
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NF/Observatory, Silver City, NM 88041, USA
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1393 Garvin Street, Prince George, BC V2M 3Z1, Canada
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INAF—Osservatorio Astronomico di Roma, via Frascati 33, Monteporzio Catone I-00040, Italy
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Department of Physics, University of Helsinki, P.O. Box 64, Helsinki FI-00014, Finland
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BAA Variable Star Section, 67 Ellerton Road, Kingstanding, Birmingham B44 0QE, UK
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Nordic Optical Telescope, Apartado 474, Santa Cruz de La Palma E-38700, Spain
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Indian Institute of Astrophysics, II Block Koramangala, Bangalore 560 034, India
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Observatori Cal Maciarol Módul 8. Masia Cal Maciarol, Camí de l’Observatori s/n, Ager, Lerida E-25691, Spain
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Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, Garching D-85748, Germany
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Physik Department, Technische Universität München, James-Franck-Str., Garching D-85748, Germany
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C/Petrarca 6 1a Sevilla E-41006, Spain
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Department of Physics, University of Adiyaman, Adiyaman 02040, Turkey
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Department of Astrophysical and Planetary Sciences, Center for Astrophysics and Space Astronomy, University of Colorado, Box 389, Boulder, CO 80309, USA
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Centre for Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, ul. Grudziadzka 5, Torun 87-100, Poland
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C/Cardenal Vidal i Barraquee No 3, Cambrils, Tarragona E-43850, Spain
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C/Matarrasa 16, Ponferrada, León E-24411, Spain
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Florida International University and SARA Observatory, University Park Campus, Miami, FL 33199, USA
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Kiepenheuer-Institut fur Sonnenphysik, Freiburg D-79104, Germany
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Janusz Gil Institute of Astronomy, University of Zielona Góra, Szafrana 2, Zielona Góra PL-65-516, Poland
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Isaac Newton Group of Telescopes, Apartado 321, Santa Cruz de La Palma E-38700, Spain
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IAC-NOT, C/Via Lactea, S/N, La Laguna E-38205, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Received: 16 July 2016 / Revised: 7 September 2016 / Accepted: 9 September 2016 / Published: 9 October 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
View Full-Text   |   Download PDF [2524 KB, uploaded 21 December 2016]   |  

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. View Full-Text
Keywords: galaxies: active; BL Lacertae objects: individual (OJ287); supermassive black holes galaxies: active; BL Lacertae objects: individual (OJ287); supermassive black holes
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Zola, S.; Valtonen, M.; Bhatta, G.; Goyal, A.; Debski, B.; Baran, A.; Krzesinski, J.; Siwak, M.; Ciprini, S.; Gopakumar, A.; Jermak, H.; Nilsson, K.; Reichart, D.; Matsumoto, K.; Sadakane, K.; Gazeas, K.; Kidger, M.; Piirola, V.; Alicavus, F.; Baliyan, K.S.; Berdyugin, A.; Boyd, D.; Campas Torrent, M.; Campos, F.; Carrillo Gómez, J.; Caton, D.B.; Chavushyan, V.; Dalessio, J.; Dimitrov, D.; Drozdz, M.; Er, H.; Erdem, A.; Escartin Pérez, A.; Fallah Ramazani, V.; Filippenko, A.V.; Garcia, F.; Gómez Pinilla, F.; Gopinathan, M.; Haislip, J.B.; Harmanen, J.; Hudec, R.; Hurst, G.; Ivarsen, K.M.; Jelinek, M.; Joshi, A.; Kagitani, M.; Kaur, N.; Keel, W.C.; LaCluyze, A.P.; Lee, B.C.; Lindfors, E.; Lozano de Haro, J.; Moore, J.P.; Mugrauer, M.; Naves Nogues, R.; Neely, A.W.; Nelson, R.H.; Ogloza, W.; Okano, S.; Pandey, J.C.; Perri, M.; Pihajoki, P.; Poyner, G.; Provencal, J.; Pursimo, T.; Raj, A.; Reinthal, R.; Sadegi, S.; Sakanoi, T.; Sameer; Salto González, J.-L.; Schweyer, T.; Soldán Alfaro, F.C.; Karaman, N.; Sonbas, E.; Steele, I.; Stocke, J.T.; Strobl, J.; Takalo, L.O.; Tomov, T.; Tremosa Espasa, L.; Valdes, J.R.; Valero Pérez, J.; Verrecchia, F.; Webb, J.R.; Yoneda, M.; Zejmo, M.; Zheng, W.; Telting, J.; Saario, J.; Reynolds, T.; Kvammen, A.; Gafton, E.; Karjalainen, R.; Blay, P. A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign. Galaxies 2016, 4, 41.

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