Monte Carlo parameter study for Seyfert AGN-starburst composite galaxies NGC1068 and NGC7469
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908552514240512 |
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| author | Salvatore, Silvia Eichmann, Björn Sommani, Giacomo del Palacio, Santiago Veres, Patrik M. Tjus, Julia Becker |
| author_facet | Salvatore, Silvia Eichmann, Björn Sommani, Giacomo del Palacio, Santiago Veres, Patrik M. Tjus, Julia Becker |
| contents | Seyfert-starburst composite galaxies host two promising phenomena of non-thermal high-energy radiation. In this regard the IceCube observation of high-energy neutrinos from the direction of the Seyfert-starburst composite galaxy NGC 1068 is not surprising. More recently, another Seyfert-starburst composite galaxy, NGC 7469, has shown hints for neutrino emission at even higher energies. Theoretical investigations could clarify that their so-called AGN corona is the most-likely origin of these neutrinos due to the need of being partially $γ$-ray opaque. In this work, we present an updated version of our Seyfert-starburst composite model from 2022, that accounts for a proper treatment of the stochastic acceleration processes in the AGN corona and the secondary electrons and positrons from leptonic radiation processes. Moreover, we use a Markov Chain Monte Carlo (MCMC) approach to study the parameter space of these two potential high-energy neutrino sources under consideration of the given prior knowledge. In the case of NGC 1068, we can successfully explain its non-thermal observational features, where both its AGN corona and starburst ring are needed to account for the observations at high- energies. In the case of NGC 7469, the high-energy signatures can only be explained assuming a small coronal radius and the including external $γγ$-pair attenuation. In general, both sources exhibit a strong influence of the $γ$-ray opaqueness on the results, highlighting the need for an accurate treatment of the intrinsic coronal X-ray field and the spatial extent of the $γ$-ray production site. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_17751 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Monte Carlo parameter study for Seyfert AGN-starburst composite galaxies NGC1068 and NGC7469 Salvatore, Silvia Eichmann, Björn Sommani, Giacomo del Palacio, Santiago Veres, Patrik M. Tjus, Julia Becker High Energy Astrophysical Phenomena Seyfert-starburst composite galaxies host two promising phenomena of non-thermal high-energy radiation. In this regard the IceCube observation of high-energy neutrinos from the direction of the Seyfert-starburst composite galaxy NGC 1068 is not surprising. More recently, another Seyfert-starburst composite galaxy, NGC 7469, has shown hints for neutrino emission at even higher energies. Theoretical investigations could clarify that their so-called AGN corona is the most-likely origin of these neutrinos due to the need of being partially $γ$-ray opaque. In this work, we present an updated version of our Seyfert-starburst composite model from 2022, that accounts for a proper treatment of the stochastic acceleration processes in the AGN corona and the secondary electrons and positrons from leptonic radiation processes. Moreover, we use a Markov Chain Monte Carlo (MCMC) approach to study the parameter space of these two potential high-energy neutrino sources under consideration of the given prior knowledge. In the case of NGC 1068, we can successfully explain its non-thermal observational features, where both its AGN corona and starburst ring are needed to account for the observations at high- energies. In the case of NGC 7469, the high-energy signatures can only be explained assuming a small coronal radius and the including external $γγ$-pair attenuation. In general, both sources exhibit a strong influence of the $γ$-ray opaqueness on the results, highlighting the need for an accurate treatment of the intrinsic coronal X-ray field and the spatial extent of the $γ$-ray production site. |
| title | Monte Carlo parameter study for Seyfert AGN-starburst composite galaxies NGC1068 and NGC7469 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2509.17751 |