Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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.
в: Monthly Notices of the Royal Astronomical Society, Том 473, № 1, 01.2018, стр. 1145-1156.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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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
KW - Galaxies: active
KW - Gamma-rays: galaxies
KW - Radiation mechanisms: non-thermal
KW - Galaxies: jets
UR - http://www.scopus.com/inward/record.url?scp=85041086662&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/multiwavelength-temporal-spectral-variability-blazar-oj-287-during-after-2015-december-flare-major-a
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 -
ID: 16274587