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

Pankaj Kushwaha, Alok C. Gupta, Paul J. Wiita, Haritma Gaur, E. M. de Gouveia Dal Pino, Jai Bhagwan, O. M. Kurtanidze, V. M. Larionov, G. Damljanovic, M. Uemura, E. Semkov, A. Strigachev, R. Bachev, O. Vince, Minfeng Gu, Z. Zhang, T. Abe, A. Agarwal, G. A. Borman, J. H. FanT. S. Grishina, J. Hirochi, R. Itoh, M. Kawabata, E. N. Kopatskaya, S. O. Kurtanidze, E. G. Larionova, L. V. Larionova, A. Mishra, D. A. Morozova, T. Nakaoka, M. G. Nikolashvili, S. S. Savchenko, Yu. V. Troitskaya, I. S. Troitsky, A. A. Vasilyev

Research output

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1145-1156
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume473
Issue number1
DOIs
Publication statusPublished - Jan 2018

Cite this

Kushwaha, Pankaj ; Gupta, Alok C. ; Wiita, Paul J. ; Gaur, Haritma ; de Gouveia Dal Pino, E. M. ; Bhagwan, Jai ; Kurtanidze, O. M. ; Larionov, V. M. ; Damljanovic, G. ; Uemura, M. ; Semkov, E. ; Strigachev, A. ; Bachev, R. ; Vince, O. ; Gu, Minfeng ; Zhang, Z. ; Abe, T. ; Agarwal, A. ; Borman, G. A. ; Fan, J. H. ; Grishina, T. S. ; Hirochi, J. ; Itoh, R. ; Kawabata, M. ; Kopatskaya, E. N. ; Kurtanidze, S. O. ; Larionova, E. G. ; Larionova, L. V. ; Mishra, A. ; Morozova, D. A. ; Nakaoka, T. ; Nikolashvili, M. G. ; Savchenko, S. S. ; Troitskaya, Yu. V. ; Troitsky, I. S. ; Vasilyev, A. A. / Multiwavelength temporal and spectral variability of the blazar OJ 287 during and after the 2015 December flare: a major accretion disc contribution. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 473, No. 1. pp. 1145-1156.
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title = "Multiwavelength temporal and spectral variability of the blazar OJ 287 during and after the 2015 December flare: a major accretion disc contribution",
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.",
keywords = "radiation mechanisms: non-thermal, galaxies: active, BL Lacertae objects: individual: OJ 287, galaxies: jets, X-rays: galaxies, gamma-rays: galaxies, ACTIVE GALACTIC NUCLEI, BLACK-HOLE MODEL, OPTICAL OUTBURST, SKY SURVEY, OJ-287, OJ287, TELESCOPE, EMISSION, JET, OSCILLATIONS",
author = "Pankaj Kushwaha and Gupta, {Alok C.} and Wiita, {Paul J.} and Haritma Gaur and {de Gouveia Dal Pino}, {E. M.} and Jai Bhagwan and Kurtanidze, {O. M.} and Larionov, {V. M.} and G. Damljanovic and M. Uemura and E. Semkov and A. Strigachev and R. Bachev and O. Vince and Minfeng Gu and Z. Zhang and T. Abe and A. Agarwal and Borman, {G. A.} and Fan, {J. H.} and Grishina, {T. S.} and J. Hirochi and R. Itoh and M. Kawabata and Kopatskaya, {E. N.} and Kurtanidze, {S. O.} and Larionova, {E. G.} and Larionova, {L. V.} and A. Mishra and Morozova, {D. A.} and T. Nakaoka and Nikolashvili, {M. G.} and Savchenko, {S. S.} and Troitskaya, {Yu. V.} and Troitsky, {I. S.} and Vasilyev, {A. A.}",
year = "2018",
month = "1",
doi = "10.1093/mnras/stx2394",
language = "Английский",
volume = "473",
pages = "1145--1156",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
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number = "1",

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Kushwaha, P, Gupta, AC, Wiita, PJ, Gaur, H, de Gouveia Dal Pino, EM, Bhagwan, J, Kurtanidze, OM, Larionov, VM, Damljanovic, G, Uemura, M, Semkov, E, Strigachev, A, Bachev, R, Vince, O, Gu, M, Zhang, Z, Abe, T, Agarwal, A, Borman, GA, Fan, JH, Grishina, TS, Hirochi, J, Itoh, R, Kawabata, M, Kopatskaya, EN, Kurtanidze, SO, Larionova, EG, Larionova, LV, Mishra, A, Morozova, DA, Nakaoka, T, Nikolashvili, MG, Savchenko, SS, Troitskaya, YV, Troitsky, IS & Vasilyev, AA 2018, 'Multiwavelength temporal and spectral variability of the blazar OJ 287 during and after the 2015 December flare: a major accretion disc contribution', Monthly Notices of the Royal Astronomical Society, vol. 473, no. 1, pp. 1145-1156. https://doi.org/10.1093/mnras/stx2394

Multiwavelength temporal and spectral variability of the blazar OJ 287 during and after the 2015 December flare: a major accretion disc contribution. / Kushwaha, Pankaj; Gupta, Alok C.; Wiita, Paul J.; Gaur, Haritma; de Gouveia Dal Pino, E. M.; Bhagwan, Jai; Kurtanidze, O. M.; Larionov, V. M.; Damljanovic, G.; Uemura, M.; Semkov, E.; Strigachev, A.; Bachev, R.; Vince, O.; Gu, Minfeng; Zhang, Z.; Abe, T.; Agarwal, A.; Borman, G. A.; Fan, J. H.; Grishina, T. S.; Hirochi, J.; Itoh, R.; Kawabata, M.; Kopatskaya, E. N.; Kurtanidze, S. O.; Larionova, E. G.; Larionova, L. V.; Mishra, A.; Morozova, D. A.; Nakaoka, T.; Nikolashvili, M. G.; Savchenko, S. S.; Troitskaya, Yu. V.; Troitsky, I. S.; Vasilyev, A. A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 473, No. 1, 01.2018, p. 1145-1156.

Research output

TY - JOUR

T1 - Multiwavelength temporal and spectral variability of the blazar OJ 287 during and after the 2015 December flare: a major accretion disc contribution

AU - Kushwaha, Pankaj

AU - Gupta, Alok C.

AU - Wiita, Paul J.

AU - Gaur, Haritma

AU - de Gouveia Dal Pino, E. M.

AU - Bhagwan, Jai

AU - Kurtanidze, O. M.

AU - Larionov, V. M.

AU - Damljanovic, G.

AU - Uemura, M.

AU - Semkov, E.

AU - Strigachev, A.

AU - Bachev, R.

AU - Vince, O.

AU - Gu, Minfeng

AU - Zhang, Z.

AU - Abe, T.

AU - Agarwal, A.

AU - Borman, G. A.

AU - Fan, J. H.

AU - Grishina, T. S.

AU - Hirochi, J.

AU - Itoh, R.

AU - Kawabata, M.

AU - Kopatskaya, E. N.

AU - Kurtanidze, S. O.

AU - Larionova, E. G.

AU - Larionova, L. V.

AU - Mishra, A.

AU - Morozova, D. A.

AU - Nakaoka, T.

AU - Nikolashvili, M. G.

AU - Savchenko, S. S.

AU - Troitskaya, Yu. V.

AU - Troitsky, I. S.

AU - Vasilyev, A. A.

PY - 2018/1

Y1 - 2018/1

N2 - 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.

AB - 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.

KW - radiation mechanisms: non-thermal

KW - galaxies: active

KW - BL Lacertae objects: individual: OJ 287

KW - galaxies: jets

KW - X-rays: galaxies

KW - gamma-rays: galaxies

KW - ACTIVE GALACTIC NUCLEI

KW - BLACK-HOLE MODEL

KW - OPTICAL OUTBURST

KW - SKY SURVEY

KW - OJ-287

KW - OJ287

KW - TELESCOPE

KW - EMISSION

KW - JET

KW - OSCILLATIONS

U2 - 10.1093/mnras/stx2394

DO - 10.1093/mnras/stx2394

M3 - статья

VL - 473

SP - 1145

EP - 1156

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -