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

by S. Zola 1,2,*, M. Valtonen 3,4, G. Bhatta 1, A. Goyal 1, B. Debski 1, A. Baran 2, J. Krzesinski 2, M. Siwak 2, S. Ciprini 5,6, A. Gopakumar 7, H. Jermak 8, K. Nilsson 4, D. Reichart 9, K. Matsumoto 10, K. Sadakane 10, K. Gazeas 11, M. Kidger 12, V. Piirola 3,4, F. Alicavus 13,14, K. S. Baliyan 15, A. Berdyugin 4, D. Boyd 16, M. Campas Torrent 17, F. Campos 18, J. Carrillo Gómez 19, D. B. Caton 20, V. Chavushyan 21, J. Dalessio 22, D. Dimitrov 23, M. Drozdz 2, H. Er 24, A. Erdem 13,14, A. Escartin Pérez 25, V. Fallah Ramazani 4, A. V. Filippenko 26, F. Garcia 27, F. Gómez Pinilla 28, M. Gopinathan 29, J. B. Haislip 30, J. Harmanen 4, R. Hudec 31,32, G. Hurst 33, K. M. Ivarsen 30, M. Jelinek 31, A. Joshi 34, M. Kagitani 35, N. Kaur 15, W. C. Keel 36, A. P. LaCluyze 30, B. C. Lee 37, E. Lindfors 4, J. Lozano de Haro 38, J. P. Moore 30, M. Mugrauer 39, R. Naves Nogues 17, A. W. Neely 40, R. H. Nelson 41, W. Ogloza 2, S. Okano 35, J. C. Pandey 34, M. Perri 5,42, P. Pihajoki 43, G. Poyner 44, J. Provencal 22, T. Pursimo 45, A. Raj 46, R. Reinthal 4, S. Sadegi 4, T. Sakanoi 35, Sameer 15, J.-L. Salto González 47, T. Schweyer 48,49, F. C. Soldán Alfaro 50, N. Karaman 51, E. Sonbas 51, I. Steele 8, J. T. Stocke 52, J. Strobl 31, L. O. Takalo 4, T. Tomov 53, L. Tremosa Espasa 54, J. R. Valdes 21, J. Valero Pérez 55, F. Verrecchia 5,42, J. R. Webb 56, M. Yoneda 57, M. Zejmo 58, W. Zheng 26, J. Telting 45, J. Saario 45, T. Reynolds 45, A. Kvammen 45, E. Gafton 45, R. Karjalainen 59 and P. Blay 60
1
Astronomical Observatory, Jagiellonian University, ul. Orla 171, Krakow 30-244, Poland
2
Mt. Suhora Observatory, Pedagogical University, ul. Podchorazych 2, Krakow 30-084, Poland
3
Finnish Centre for Astronomy with ESO, University of Turku, Turku F-21500, Finland
4
Tuorla Observatory, Department of Physics and Astronomy, University of Turku, Turku F-21500, Finland
5
Agenzia Spaziale Italiana (ASI) Science Data Center, Roma I-00133, Italy
6
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Perugia I-06123, Italy
7
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai 400005, India
8
Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, Brownlow Hill L3 5RF, UK
9
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
14
Astrophysics Research Center and Ulupinar Observatory, Canakkale Onsekiz Mart University, Canakkale TR-17100, Turkey
15
Physical Research Laboratory, Ahmedabad 380009, India
16
5, Silver Lane, West Challow, Wantage, Oxon OX12 9TX, UK
17
C/Jaume Balmes No 24, Cabrils, Barcelona E-08348, Spain
18
C/.Riera, 1, 1o 3a B, Vallirana, Barcelona E-08759, Spain
19
Carretera de Martos 28 primero Fuensanta, Jaen E-23001, Spain
20
Dark Sky Observatory, Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USA
21
Instituto Nacional de Astrofisica, Óptica y Electrónica, Apartado Postal 51-216, Puebla 72000, Mexico
22
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
23
Institute of Astronomy and NAO, Bulgarian Academy of Science, 72 Tsarigradsko Chaussee Blvd., Sofia 1784, Bulgaria
24
Department of Physics, Faculty of Science, Atatürk University, Erzurum 25240, Turkey
25
Aritz Bidea No 8 4 B, Mungia, Bizkaia E-48100, Spain
26
Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA
27
Muñas de Arriba La Vara, Valdés E-33780, Spain
28
C/Concejo de Teverga 9, 1 C, Madrid E-28053, Spain
29
Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263002, India
30
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA
31
Astronomical Institute, The Czech Academy of Sciences, Ondřejov 25165, Czech Republic
32
Faculty of Electrical Engineering, Czech Technical University, Prague 74864, Czech Republic
33
16 Westminster Close, Basingstoke, Hampshire RG22 4PP, UK
34
Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263002, India
35
Planetary Plasma and Atmospheric Research Center, Tohoku University, Sendai 980-8578, Japan
36
Department of Physics and Astronomy and SARA Observatory, University of Alabama, Box 870324, Tuscaloosa, AL 35487, USA
37
Korea Astronomy and Space Science Institute, 776, Daedeokdae-Ro, Youseong-Gu, Daejeon 305-348, Korea
38
Partida de Maitino, Pol. 2 Num. 163, Elche E-03206, Spain
39
Astrophysikalisches Institut und Universitäts-Sternwarte, Schillergäßchen 2-3, Jena D-07745, Germany
40
NF/Observatory, Silver City, NM 88041, USA
41
1393 Garvin Street, Prince George, BC V2M 3Z1, Canada
42
INAF—Osservatorio Astronomico di Roma, via Frascati 33, Monteporzio Catone I-00040, Italy
43
Department of Physics, University of Helsinki, P.O. Box 64, Helsinki FI-00014, Finland
44
BAA Variable Star Section, 67 Ellerton Road, Kingstanding, Birmingham B44 0QE, UK
45
Nordic Optical Telescope, Apartado 474, Santa Cruz de La Palma E-38700, Spain
46
Indian Institute of Astrophysics, II Block Koramangala, Bangalore 560 034, India
47
Observatori Cal Maciarol Módul 8. Masia Cal Maciarol, Camí de l’Observatori s/n, Ager, Lerida E-25691, Spain
48
Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, Garching D-85748, Germany
49
Physik Department, Technische Universität München, James-Franck-Str., Garching D-85748, Germany
50
C/Petrarca 6 1a Sevilla E-41006, Spain
51
Department of Physics, University of Adiyaman, Adiyaman 02040, Turkey
52
Department of Astrophysical and Planetary Sciences, Center for Astrophysics and Space Astronomy, University of Colorado, Box 389, Boulder, CO 80309, USA
53
Centre for Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, ul. Grudziadzka 5, Torun 87-100, Poland
54
C/Cardenal Vidal i Barraquee No 3, Cambrils, Tarragona E-43850, Spain
55
C/Matarrasa 16, Ponferrada, León E-24411, Spain
56
Florida International University and SARA Observatory, University Park Campus, Miami, FL 33199, USA
57
Kiepenheuer-Institut fur Sonnenphysik, Freiburg D-79104, Germany
58
Janusz Gil Institute of Astronomy, University of Zielona Góra, Szafrana 2, Zielona Góra PL-65-516, Poland
59
Isaac Newton Group of Telescopes, Apartado 321, Santa Cruz de La Palma E-38700, Spain
60
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
Galaxies 2016, 4(4), 41; https://doi.org/10.3390/galaxies4040041
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)
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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