학술논문
A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign
Document Type
article
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; P. Blay
Source
Galaxies, Vol 4, Iss 4, p 41 (2016)
Subject
Language
English
ISSN
2075-4434
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.