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Temporal correlation between the optical and γ-ray flux variations in the blazar 3C 454.3

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dc.contributor.author Rajput, Bhoomika
dc.contributor.author Stalin, C. S
dc.contributor.author Sahayanathan, S
dc.contributor.author Rakshit, S
dc.contributor.author Amit Kumar Mandal
dc.date.accessioned 2020-11-19T13:26:58Z
dc.date.available 2020-11-19T13:26:58Z
dc.date.issued 2019-06
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 486, No. 2, pp. 1781-1795 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7227
dc.description Restricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/stz941 en_US
dc.description.abstract Blazars show optical and γ-ray flux variations that are generally correlated, although there are exceptions. Here we present anomalous behaviour seen in the blazar 3C 454.3 based on an analysis of quasi-simultaneous data at optical, ultraviolet, X-ray, and γ-ray energies, spanning about 9 yr from 2008 August to 2017 February. We have identified four time intervals (epochs), A, B, D, and E, when the source showed large-amplitude optical flares. In epochs A and B the optical and γ-ray flares are correlated, while in D and E corresponding flares in γ-rays are weak or absent. In epoch B the degree of optical polarization strongly correlates with changes in optical flux during a short-duration optical flare superimposed on one of long duration. In epoch E the optical flux and degree of polarization are anticorrelated during both the rising and declining phases of the optical flare. We carried out broad-band spectral energy distribution (SED) modelling of the source for the flaring epochs A,B, D, and E, and a quiescent epoch, C. Our SED modelling indicates that optical flares with absent or weak corresponding γ-ray flares in epochs D and E could arise from changes in a combination of parameters, such as the bulk Lorentz factor, magnetic field, and electron energy density, or be due to changes in the location of the γ-ray-emitting regions. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Galaxies: active en_US
dc.subject Galaxies: jets en_US
dc.subject Galaxies: nuclei en_US
dc.subject Quasars: individual: 3C 454.3 en_US
dc.subject Gamma-rays: galaxies en_US
dc.subject X-rays: galaxies en_US
dc.title Temporal correlation between the optical and γ-ray flux variations in the blazar 3C 454.3 en_US
dc.type Article en_US

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