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dc.contributor.authorRajput, Bhoomika-
dc.contributor.authorStalin, C. S-
dc.contributor.authorSahayanathan, S-
dc.contributor.authorRakshit, S-
dc.contributor.authorAmit Kumar Mandal-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Vol. 486, No. 2, pp.1781–1795en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractBlazars 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.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.rights© Royal Astronomical Society-
dc.subjectGalaxies: activeen_US
dc.subjectGalaxies: jetsen_US
dc.subjectGalaxies: nucleien_US
dc.subjectQuasars: individual: 3C 454.3en_US
dc.subjectGamma-rays: galaxiesen_US
dc.subjectX-rays: galaxiesen_US
dc.titleTemporal correlation between the optical and γ-ray flux variations in the blazar 3C 454.3en_US
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