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

Valtonen, Mauri J. and Zola, Staszek and Pihajoki, Pauli and Enestam, Sissi and Lehto, Harry J. and Dey, Lankeswar and Gopakumar, Achamveedu and Drozdz, Marek and Ogloza, Waldemar and Zejmo, Michal and Gupta, Alok C. and Pursimo, Tapio and Ciprini, Stefano and Kidger, Mark and Nilsson, Kari and Berdyugin, Andrei and Piirola, Vilppu and Jermak, Helen and Hudec, Rene and Laine, Seppo (2019) Accretion Disk Parameters Determined from the Great 2015 Flare of OJ 287. Astrophysical Journal, 882 (2). Art. No. 88. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20190905-095345704

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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, α, and the mass accretion rate, m. We find α = 0.26±0.1 and m=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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/ab3573DOIArticle
https://arxiv.org/abs/1907.11011arXivDiscussion Paper
ORCID:
AuthorORCID
Valtonen, Mauri J.0000-0001-8580-8874
Dey, Lankeswar0000-0002-2554-0674
Gupta, Alok C.0000-0002-9331-4388
Nilsson, Kari0000-0002-1445-8683
Laine, Seppo0000-0003-1250-8314
Additional Information:© 2019 The American Astronomical Society. Received 2019 April 12; revised 2019 July 22; accepted 2019 July 23; published 2019 September 5. M.V. acknowledges a grant from the Finnish Society of Sciences and Letters, and S.Z. acknowledges the NCN grant number 2018/29/B/ST9/01793.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Finnish Society of Sciences and LettersUNSPECIFIED
National Science Centre (Poland)2018/29/B/ST9/01793
Subject Keywords:accretion, accretion disks – black hole physics – BL Lacertae objects: individual (OJ 287)
Issue or Number:2
Record Number:CaltechAUTHORS:20190905-095345704
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190905-095345704
Official Citation:Mauri J. Valtonen et al 2019 ApJ 882 88
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98425
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Sep 2019 19:37
Last Modified:13 Nov 2019 23:06

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