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 Investigation of the correlation between optical and ?-ray flux variations in the blazar Ton 599 Subject The topic of the resource galaxies: Active; galaxies: jets; galaxies: nuclei; gamma-rays: galaxies Description An account of the resource The correlation between optical and ?-ray flux variations in blazars reveals a complex behaviour. In this study, we present our analysis of the connection between changes in optical and ?-ray emissions in the blazar Ton 599 over a span of approximately 15 yr, from 2008 August to 2023 March. Ton 599 reached its highest flux state across the entire electromagnetic spectrum during the second week of 2023 January. To investigate the connection between changes in optical and ?-ray flux, we have designated five specific time periods, labelled as epochs A, B, C, D, and E. During periods B, C, D, and E, the source exhibited optical flares, while it was in its quiescent state during period A. The ?-ray counterparts to these optical flares are present during periods B, C, and E; however, during period D, the ?-ray counterpart is either weak or absent. We conducted a broad-band spectral energy distribution (SED) fitting by employing a one-zone leptonic emission model for these epochs. The SED analysis unveiled that the optical-ultraviolet emission primarily emanated from the accretion disc in quiescent period A, whereas synchrotron radiation from the jet dominated during periods B, C, D, and E. Diverse correlated patterns in the variations of optical and ?-ray emissions, like correlated optical and ?-ray flares, could be accounted for by changes in factors such as the magnetic field, bulk Lorentz factor, and electron density. On the other hand, an orphan optical flare could result from increased magnetic field and bulk Lorentz factor. 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. Creator An entity primarily responsible for making the resource Rajput B.; Mandal A.K.; Pandey A.; Stalin C.S.; Max-Moerbeck W.; Mathew B. Source A related resource from which the described resource is derived Monthly Notices of the Royal Astronomical Society, Vol-527, No. 4, pp. 11900-11914. 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 2024-01-01 Identifier An unambiguous reference to the resource within a given context <a href="https://doi.org/10.1093/mnras/stad4003" target="_blank" rel="noreferrer noopener">https://doi.org/10.1093/mnras/stad4003</a> <br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85182255773&amp;doi=10.1093%2Fmnras%2Fstad4003&amp;partnerID=40&amp;md5=6c16e3ed53764a09f8217f6de50dff45" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85182255773&amp;doi=10.1093%2fmnras%2fstad4003&amp;partnerID=40&amp;md5=6c16e3ed53764a09f8217f6de50dff45</a> Rights Information about rights held in and over the resource All Open Access; Hybrid Gold 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., Departamento de Astronomi Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, 7570840, Chile, Department of Physics, CHRIST (Deemed to Be University), Hosur Road, Bangalore, 560029, India; Mandal A.K., Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul, 151-742, South Korea; Pandey A., Center for Theoretical Physics, Polish Academy of Sciences, Al. Lotnik 32/46, Warsaw, PL-02-668, Poland; Stalin C.S., Indian Institute of Astrophysics, Block II, Koramangala, Bangalore, 560034, India; Max-Moerbeck W., Departamento de Astronomi Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, 7570840, Chile; Mathew B., Department of Physics, CHRIST (Deemed to Be University), Hosur Road, Bangalore, 560029, India