A peculiar multiwavelength flare in the blazar 3C 454.3

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Gupta, Alok C.
dc.contributor.author Mangalam, Arun
dc.contributor.author Wiita, Paul J.
dc.contributor.author Kushwaha, P.
dc.contributor.author Gaur, H.
dc.contributor.author Zhang, H.
dc.contributor.author Gu, M. F.
dc.contributor.author Liao, M.
dc.contributor.author Dewangan, G. C.
dc.contributor.author Ho, L. C.
dc.contributor.author Mohan, P.
dc.contributor.author Umeura, M.
dc.contributor.author Sasada, M.
dc.contributor.author Volvach, A. E.
dc.contributor.author Agarwal, A.
dc.contributor.author Aller, M. F.
dc.contributor.author Aller, H. D.
dc.contributor.author Bachev, R.
dc.contributor.author Lähteenmäki, A.
dc.contributor.author Semkov, E.
dc.contributor.author Strigachev, A.
dc.contributor.author Tornikoski, M.
dc.contributor.author Volvach, L. N.
dc.date.accessioned 2017-11-21T13:39:58Z
dc.date.available 2017-11-21T13:39:58Z
dc.date.issued 2017-11-01
dc.identifier.citation Gupta , A C , Mangalam , A , Wiita , P J , Kushwaha , P , Gaur , H , Zhang , H , Gu , M F , Liao , M , Dewangan , G C , Ho , L C , Mohan , P , Umeura , M , Sasada , M , Volvach , A E , Agarwal , A , Aller , M F , Aller , H D , Bachev , R , Lähteenmäki , A , Semkov , E , Strigachev , A , Tornikoski , M & Volvach , L N 2017 , ' A peculiar multiwavelength flare in the blazar 3C 454.3 ' Monthly Notices of the Royal Astronomical Society , vol 472 , no. 1 , pp. 788-798 . DOI: 10.1093/mnras/stx2072 en
dc.identifier.issn 0035-8711
dc.identifier.issn 1365-2966
dc.identifier.other PURE UUID: f04af498-f274-47db-b6c6-80d4d0494ffc
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/a-peculiar-multiwavelength-flare-in-the-blazar-3c-4543(f04af498-f274-47db-b6c6-80d4d0494ffc).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85030538739&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/15802779/gupta_et_al_stx2072.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/28883
dc.description.abstract The blazar 3C 454.3 exhibited a strong flare seen in γ-rays, X-rays and optical/near-infrared bands during 2009 December 3-12. Emission in the V and J bands rose more gradually than did the γ-rays and soft X-rays, though all peaked at nearly the same time. Optical polarization measurements showed dramatic changes during the flare, with a strong anticorrelation between optical flux and degree of polarization (which rose from ∼3 to ∼20 per cent) during the declining phase of the flare. The flare was accompanied by large rapid swings in polarization angle of ∼170°. This combination of behaviours appears to be unique.We have cm-band radio data during the same period but they show no correlation with variations at higher frequencies. Such peculiar behaviour may be explained using jet models incorporating fully relativistic effects with a dominant source region moving along a helical path or by a shock-in-jet model incorporating three-dimensional radiation transfer if there is a dominant helical magnetic field. We find that spectral energy distributions at different times during the flare can be fit using modified one-zone models where only the magnetic field strength and particle break frequencies and normalizations need change. An optical spectrum taken at nearly the same time provides an estimate for the central black hole mass of ∼2.3 × 109Mo˙.We also consider two weaker flares seen during the ∼200 d span over which multiband data are available. In one of them, the V and J bands appear to lead the γ-ray and X-ray bands by a few days; in the other, all variations are simultaneous. en
dc.format.extent 11
dc.format.extent 788-798
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Monthly Notices of the Royal Astronomical Society en
dc.relation.ispartofseries Volume 472, issue 1 en
dc.rights openAccess en
dc.subject.other Astronomy and Astrophysics en
dc.subject.other Space and Planetary Science en
dc.subject.other 115 Astronomy and space science en
dc.title A peculiar multiwavelength flare in the blazar 3C 454.3 en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Shanghai Astronomical Observatory Chinese Academy of Sciences
dc.contributor.department Indian Institute of Astrophysics
dc.contributor.department College of New Jersey
dc.contributor.department Universidade de Sao Paulo
dc.contributor.department Ohio University
dc.contributor.department Inter-University Centre for Astronomy and Astrophysics India
dc.contributor.department Peking University
dc.contributor.department Hiroshima University
dc.contributor.department Kyoto University
dc.contributor.department Kyiv National Taras Shevchenko University
dc.contributor.department Aryabhatta Research Institute of Observational Sciences
dc.contributor.department University of Michigan, Ann Arbor
dc.contributor.department Bulgarian Academy of Sciences
dc.contributor.department Metsähovi Radio Observatory
dc.subject.keyword BL Lacertae objects: general
dc.subject.keyword Galaxies: active
dc.subject.keyword Quasars: individual: 3C 454.3
dc.subject.keyword Astronomy and Astrophysics
dc.subject.keyword Space and Planetary Science
dc.subject.keyword 115 Astronomy and space science
dc.identifier.urn URN:NBN:fi:aalto-201711217704
dc.identifier.doi 10.1093/mnras/stx2072
dc.type.version publishedVersion

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