A2 Refereed review article in a scientific journal
The Unique Blazar OJ 287 and Its Massive Binary Black Hole Central Engine
Authors: Dey L, Gopakumar A, Valtonen M, Zola S, Susobhanan A, Hudec R, Pihajoki P, Pursimo T, Berdyugin A, Piirola V, Ciprini S, Nilsson K, Jermak H, Kidger M, Komossa S
Publisher: MDPI
Publication year: 2019
Journal: Universe
Journal name in source: UNIVERSE
Journal acronym: UNIVERSE-BASEL
Article number: ARTN 108
Volume: 5
Issue: 5
Number of pages: 16
ISSN: 2218-1997
eISSN: 2218-1997
DOI: https://doi.org/10.3390/universe5050108
Web address : https://www.mdpi.com/2218-1997/5/5/108/htm
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/41404331
The bright blazar OJ 287 is the best-known candidate for hosting a nanohertz gravitational wave (GW) emitting supermassive binary black hole (SMBBH) in the present observable universe. The binary black hole (BBH) central engine model, proposed by Lehto and Valtonen in 1996, was influenced by the two distinct periodicities inferred from the optical light curve of OJ 287. The current improved model employs an accurate general relativistic description to track the trajectory of the secondary black hole (BH) which is crucial to predict the inherent impact flares of OJ 287. The successful observations of three predicted impact flares open up the possibility of using this BBH system to test general relativity in a hitherto unexplored strong field regime. Additionally, we briefly describe an ongoing effort to interpret observations of OJ 287 in a Bayesian framework.
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