A1 Refereed original research article in a scientific journal
A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign
Authors: 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., Berdyugin A., Boyd D., Campas Torrent M., Campos F., Carrillo Gómez J., Caton D., Chavushyan V., Dalessio J., Dimitrov D., Drozdz M., Er H., Erdem A., Escartin Pérez A., Fallah Ramazani V., Filippenko A., Garcia F., Gómez Pinilla F., Gopinathan M., Haislip J., Harmanen J., Hudec R., Hurst G., Ivarsen K., Jelinek M., Joshi A., Kagitani M., Kaur N., Keel W., LaCluyze A., Lee B., Lindfors E., Lozano de Haro J., Moore J., Mugrauer M., Naves Nogues R., Neely A., Nelson R., Ogloza W., Okano S., Pandey J., 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., Karaman N., Sonbas E., Steele I., Stocke J., Strobl J., Takalo L., Tomov T., Tremosa Espasa L., Valdes J., Valero Pérez J., Verrecchia F., Webb J., Yoneda M., Zejmo M., Zheng W., Telting J., Saario J., Reynolds T., Kvammen A., Gafton E., Karjalainen R., Blay P.
Publisher: M D P I AG
Publishing place: Basel
Publication year: 2016
Journal: Galaxies
Journal acronym: Galax
Article number: 41
Volume: 4
Issue: 4
Number of pages: 7
ISSN: 2075-4434
eISSN: 2075-4434
DOI: https://doi.org/10.3390/galaxies4040041
Web address : http://www.mdpi.com/2075-4434/4/4/41
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.
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