Multiwavelength spectral modelling of the candidate neutrino blazar PKS 0735+178
- Title
- Multiwavelength spectral modelling of the candidate neutrino blazar PKS 0735+178
- Creator
- Bharathan A.M.; Stalin C.S.; Sahayanathan S.; Bhattacharyya S.; Mathew B.
- Description
- The BL Lac object PKS 0735+178 was in its historic ?-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 ?-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 ?-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 ?-ray emission in the hundreds of GeV that could not be accounted for by the synchrotron self-Compton process. 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
- Source
- Monthly Notices of the Royal Astronomical Society, Vol-529, No. 4, pp. 3503-3510.
- Date
- 2024-01-01
- Publisher
- Oxford University Press
- Subject
- galaxies: active; galaxies: BL Lacertae objects: individual: PKS 0735+178; galaxies: jets
- Coverage
- Bharathan A.M., Department of Physics and Electronics, Christ (Deemed to Be University), Bangalore, 560029, 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, Homi Bhabha National Institute, Mumbai, 400094, India; Bhattacharyya S., Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai, 400085, India, Homi Bhabha National Institute, Mumbai, 400094, India; Mathew B., Department of Physics and Electronics, Christ (Deemed to Be University), Bangalore, 560029, India
- Rights
- All Open Access; Gold Open Access; Green Open Access
- Relation
- ISSN: 358711; CODEN: MNRAA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Bharathan A.M.; Stalin C.S.; Sahayanathan S.; Bhattacharyya S.; Mathew B., “Multiwavelength spectral modelling of the candidate neutrino blazar PKS 0735+178,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 24, 2025, https://archives.christuniversity.in/items/show/13228.