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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Multiwavelength temporal and spectral variability of the blazar OJ 287 during and after the 2015 December flare: a major accretion disc contribution

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Author(s):
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Kushwaha, Pankaj [1] ; Gupta, Alok C. [2, 3] ; Wiita, Paul J. [4] ; Gaur, Haritma [2] ; de Gouveia Dal Pino, E. M. [1] ; Bhagwan, Jai [5] ; Kurtanidze, O. M. [6, 7] ; Larionov, V. M. [8, 9] ; Damljanovic, G. [10] ; Uemura, M. [11] ; Semkov, E. [12, 13] ; Strigachev, A. [12, 13] ; Bachev, R. [12, 13] ; Vince, O. [10] ; Gu, Minfeng [2] ; Zhang, Z. [14] ; Abe, T. [11] ; Agarwal, A. [3] ; Borman, G. A. [15] ; Fan, J. H. [16] ; Grishina, T. S. [9] ; Hirochi, J. [11] ; Itoh, R. [17] ; Kawabata, M. [11] ; Kopatskaya, E. N. [9] ; Kurtanidze, S. O. [6] ; Larionova, E. G. [9] ; Larionova, L. V. [9] ; Mishra, A. [3] ; Morozova, D. A. [9] ; Nakaoka, T. [11] ; Nikolashvili, M. G. [6] ; Savchenko, S. S. [9] ; Troitskaya, Yu. V. [9] ; Troitsky, I. S. [9] ; Vasilyev, A. A. [9]
Total Authors: 36
Affiliation:
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[1] Univ Sao Paulo, Dept Astron IAG USP, BR-05508090 Sao Paulo - Brazil
[2] Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030 - Peoples R China
[3] Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002 - India
[4] Coll New Jersey, Dept Phys, POB 7718, Ewing, NJ 08628 - USA
[5] Pt Ravishankar Shukla Univ, Sch Studies Phys & Astrophys, Amanaka GE Rd, Raipur 492010, Madhya Pradesh - India
[6] Abastumani Observ, Mt Kanobili 0301, Abastumani - Rep of Georgia
[7] Kazan Fed Univ, Engelhardt Astron Observ, Tatarstan 420008 - Russia
[8] Pulkovo Observ, St Petersburg 196140 - Russia
[9] St Petersburg State Univ, Astron Inst, St Petersburg 198504 - Russia
[10] Astron Observ, Volgina 7, Belgrade 11060 - Serbia
[11] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Kagamiyama 1-3-1, Higashihiroshima 7398526 - Japan
[12] Bulgarian Acad Sci, Inst Astron, 72 Tsarigradsko Shosse Blvd, BU-1784 Sofia - Bulgaria
[13] Bulgarian Acad Sci, Natl Astron Observ, 72 Tsarigradsko Shosse Blvd, BU-1784 Sofia - Bulgaria
[14] Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030 - Peoples R China
[15] Crimean Astrophys Observ, P-O Nauchny, UA-298409 Nauchnyi, Crimea - Ukraine
[16] Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong - Peoples R China
[17] Tokyo Inst Technol, Dept Phys, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551 - Japan
Total Affiliations: 17
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 473, n. 1, p. 1145-1156, JAN 2018.
Web of Science Citations: 4
Abstract

We present a multiwavelength spectral and temporal analysis of the blazar OJ 287 during its recent activity between 2015 December and 2016 May, showing strong variability in the near-infrared (NIR) to X-ray energies with detection at gamma-ray energies as well. Most of the optical flux variations exhibit strong changes in polarization angle and degree. All the interband time lags are consistent with simultaneous emissions. Interestingly, on days with excellent data coverage in the NIR-UV bands, the spectral energy distributions (SEDs) show signatures of bumps in the visible-UV bands, never seen before in this source. The optical bump can be explained as accretion-disc emission associated with the primary black hole of mass similar to 1.8 x 10(10) M-circle dot while the little bump feature in the optical-UV appears consistent with line emission. Further, the broad-band SEDs extracted during the first flare and during a quiescent period during this span show very different gamma-ray spectra compared to previously observed flare or quiescent spectra. The probable thermal bump in the visible seems to have been clearly present since 2013 May, as found by examining all available NIR-optical observations, and favours the binary supermassive black hole model. The simultaneous multiwavelength variability and relatively weak gamma-ray emission that shows a shift in the SED peak is consistent with gamma-ray emission originating from inverse Compton scattering of photons from the line emission that apparently contributes to the little blue bump. (AU)

FAPESP's process: 15/13933-0 - Probing relativistic jets and high energy emission through Multi-wavelength observation analysis
Grantee:Pankaj Kushwaha
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/10559-5 - Investigation of high energy and plasma astrophysics phenomena: theory, numerical simulations, observations, and instrument development for the Cherenkov Telescope Array (CTA)
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Research Projects - Thematic Grants