Multi-wavelength spectral modelling of the candidate neutrino blazar PKS 0735+178
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916103367688192 |
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| author | Bharathan, Athira M Stalin, C. S. Sahayanathan, S. Bhattacharyya, Subir Mathew, Blesson |
| author_facet | Bharathan, Athira M Stalin, C. S. Sahayanathan, S. Bhattacharyya, Subir Mathew, Blesson |
| contents | The BL Lac object PKS 0735+178 was in its historic $γ$-ray brightness state during December 2021. This period also coincides with the detection of a neutrino event IC211208A, 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 ($E_{1}$), (b) moderate activity state ($E_{2}$) and (c) high activity state ($E_{3}$) coincident with the epoch of neutrino detection. During the epoch of neutrino detection ($E_{3}$), we found the largest variability amplitude of 95%. 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 the epoch $E_{3}$, we found the shortest flux doubling/halving time of 5.75 hrs. Even though the spectral energy distribution in the moderate activity state and in the high activity state could be modeled 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 photo-meson process was needed to explain the excess $γ$-ray emission in the hundreds of GeV which could not be accounted for by the synchrotron self-Compton process. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_12680 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multi-wavelength spectral modelling of the candidate neutrino blazar PKS 0735+178 Bharathan, Athira M Stalin, C. S. Sahayanathan, S. Bhattacharyya, Subir Mathew, Blesson High Energy Astrophysical Phenomena The BL Lac object PKS 0735+178 was in its historic $γ$-ray brightness state during December 2021. This period also coincides with the detection of a neutrino event IC211208A, 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 ($E_{1}$), (b) moderate activity state ($E_{2}$) and (c) high activity state ($E_{3}$) coincident with the epoch of neutrino detection. During the epoch of neutrino detection ($E_{3}$), we found the largest variability amplitude of 95%. 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 the epoch $E_{3}$, we found the shortest flux doubling/halving time of 5.75 hrs. Even though the spectral energy distribution in the moderate activity state and in the high activity state could be modeled 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 photo-meson process was needed to explain the excess $γ$-ray emission in the hundreds of GeV which could not be accounted for by the synchrotron self-Compton process. |
| title | Multi-wavelength spectral modelling of the candidate neutrino blazar PKS 0735+178 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2401.12680 |