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Title: Temporal correlation between the optical and γ-ray flux variations in the blazar 3C 454.3
Authors: Rajput, Bhoomika
Stalin, C. S
Sahayanathan, S
Rakshit, S
Amit Kumar Mandal
Keywords: Galaxies: active;Galaxies: jets;Galaxies: nuclei;Quasars: individual: 3C 454.3;Gamma-rays: galaxies;X-rays: galaxies
Issue Date: Jun-2019
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 486, No. 2, pp.1781–1795
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.
Description: Restricted Access
ISSN: 1365-2966
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Appears in Collections:IIAP Publications

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