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Multiwavelength spectral modelling of the candidate neutrino blazar PKS 0735+178

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dc.contributor.author Bharathan, Athira M
dc.contributor.author Stalin, C. S
dc.contributor.author Sahayanathan, S
dc.contributor.author Bhattacharyya, Subir
dc.contributor.author Mathew, Blesson
dc.date.accessioned 2024-05-29T06:41:45Z
dc.date.available 2024-05-29T06:41:45Z
dc.date.issued 2024-04
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 529, No. 4, pp. 3503–3510 en_US
dc.identifier.issn 0035-8711
dc.identifier.uri http://hdl.handle.net/2248/8466
dc.description Open Access. en_US
dc.description This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.description.abstract The BL Lac object PKS 0735+178 was in its historic γ-ray brightness state during 2021 December. This period also coincides with the detection of a neutrino event IC 211208A, which was localized close to the vicinity of PKS 0735+178. We carried out detailed γ-ray timing and spectral analysis of the source in three epochs: (a) quiescent state (E1), (b) moderate-activity state (E2), and (c) high-activity state (E3) coincident with the epoch of neutrino detection. During the epoch of neutrino detection (E3), we found the largest variability amplitude of 95 per cent. The γ-ray spectra corresponding to these three epochs are well fit by the power-law model and the source is found to show spectral variations with a softer when brighter trend. In epoch E3, we found the shortest flux doubling/halving time of 5.75 h. Even though the spectral energy distribution in the moderate-activity state and in the high-activity state could be modelled by the one-zone leptonic emission model, the spectral energy distribution in the quiescent state required an additional component of radiation over and above the leptonic component. Here, we show that a photomeson process was needed to explain the excess γ-ray emission in the hundreds of GeV that could not be accounted for by the synchrotron self-Compton process. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of Royal Astronomical Society en_US
dc.relation.uri https://doi.org/10.1093/mnras/stae296
dc.rights © The Author(s) 2024.
dc.subject Galaxies: active en_US
dc.subject Galaxies: BL Lacertae objects: individual: PKS 0735+178 en_US
dc.subject Galaxies: jets en_US
dc.title Multiwavelength spectral modelling of the candidate neutrino blazar PKS 0735+178 en_US
dc.type Article en_US


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