Accretion Disk Parameters Determined from the Great 2015 Flare of OJ 287

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Valtonen , M J , Zola , S , Pihajoki , P , Enestam , S , Lehto , H J , Dey , L , Gopakumar , A , Drozdz , M , Ogloza , W , Zejmos , M , Gupta , A C , Pursimo , T , Ciprini , S , Kidger , M , Nilsson , K , Berdyugin , A , Piirola , V , Jermak , H , Hudec , R & Laine , S 2019 , ' Accretion Disk Parameters Determined from the Great 2015 Flare of OJ 287 ' , Astrophysical Journal , vol. 882 , no. 2 , 88 . https://doi.org/10.3847/1538-4357/ab3573

Title: Accretion Disk Parameters Determined from the Great 2015 Flare of OJ 287
Author: Valtonen, Mauri J.; Zola, Staszek; Pihajoki, Pauli; Enestam, Sissi; Lehto, Harry J.; Dey, Lankeswar; Gopakumar, Achamveedu; Drozdz, Marek; Ogloza, Waldemar; Zejmos, Michal; Gupta, Alok C.; Pursimo, Tapio; Ciprini, Stefano; Kidger, Mark; Nilsson, Kari; Berdyugin, Andrei; Piirola, Vilppu; Jermak, Helen; Hudec, Rene; Laine, Seppo
Contributor: University of Helsinki, Particle Physics and Astrophysics
Date: 2019-09-10
Language: eng
Number of pages: 8
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
URI: http://hdl.handle.net/10138/306279
Abstract: In the binary black hole model of OJ. 287, the secondary black hole orbits a much more massive primary, and impacts on the primary accretion disk at predictable times. We update the parameters of the disk, the viscosity, alpha, and the mass accretion rate, . We find alpha = 0.26 +/- 0.1 and = 0.08 +/- 0.04 in Eddington units. The former value is consistent with Coroniti, and the latter with Marscher & Jorstad. Predictions are made for the 2019 July 30 superflare in OJ. 287. We expect that it will take place simultaneously at the Spitzer infrared channels, as well as in the optical, and that therefore the timing of the flare in optical can be accurately determined from Spitzer observations. We also discuss in detail the light curve of the 2015 flare, and find that the radiating volume has regions where bremsstrahlung dominates, as well as regions that radiate primarily in synchrotron radiation. The former region produces the unpolarized first flare, while the latter region gives rise to a highly polarized second flare.
Subject: accretion
accretion disks
black hole physics
BL Lacertae objects: individual (OJ 287)
ACTIVE GALACTIC NUCLEI
VARIABILITY
VISCOSITY
QUASARS
OJ-287
115 Astronomy, Space science
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