Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Articles Article Faculty Publications -Articles Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Temporal correlation between the optical and ? -ray flux variations in the blazar 3C 454.3 Subject The topic of the resource galaxies: active; galaxies: jets; galaxies: nuclei; gamma-rays: galaxies; quasars: individual: 3C 454.3; X-rays: galaxies. Description An account of the resource Blazars show optical and ? -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 ? -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 ? -ray flares are correlated, while in D and E corresponding flares in ? -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 ? -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 ? -ray-emitting regions. 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. Creator An entity primarily responsible for making the resource Rajput B.; Stalin C.S.; Sahayanathan S.; Rakshit S.; Mandal A.K. Source A related resource from which the described resource is derived Monthly Notices of the Royal Astronomical Society, Vol-486, No. 2, pp. 1781-1795. Publisher An entity responsible for making the resource available Oxford University Press Date A point or period of time associated with an event in the lifecycle of the resource 2019-01-01 Identifier An unambiguous reference to the resource within a given context <a href="https://doi.org/10.1093/mnras/stz941" target="_blank" rel="noreferrer noopener">https://doi.org/10.1093/mnras/stz941</a> <br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067992903&amp;doi=10.1093%2Fmnras%2Fstz941&amp;partnerID=40&amp;md5=334a4e011546f49bf92eb75cab59d862" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067992903&amp;doi=10.1093%2fmnras%2fstz941&amp;partnerID=40&amp;md5=334a4e011546f49bf92eb75cab59d862</a> Rights Information about rights held in and over the resource All Open Access; Green Open Access Relation A related resource ISSN: 358711; CODEN: MNRAA Format The file format, physical medium, or dimensions of the resource Online Language A language of the resource English Type The nature or genre of the resource Article Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Rajput B., Indian Institute of Astrophysics, Block II, Koramangala, Bangalore, 560034, India; Stalin C.S., Indian Institute of Astrophysics, Block II, Koramangala, Bangalore, 560034, India; Sahayanathan S., Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Rakshit S., Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Quantum, Vesilinnantie 5, Turku, FI-20014, Finland, Astrophysical-Sciences-Division, Bhabha Atomic Research-Centre, Mumbai, 400085, India; Mandal A.K., Indian Institute of Astrophysics, Block II, Koramangala, Bangalore, 560034, India, Department of Physics, CHRIST (Deemed to Be University), Hosur Road, Bangalore, 560029, India