| Issue |
A&A
Volume 684, April 2024
|
|
|---|---|---|
| Article Number | L21 | |
| Number of page(s) | 4 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202450025 | |
| Published online | 19 April 2024 | |
Letter to the Editor
The neutrino background from non-jetted active galactic nuclei
1
European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany
e-mail: ppadovan@eso.org
2
INAF – Osservatorio di Astrofisica e Scienza dello Spazio, via Piero Gobetti 93/3, 40129 Bologna, Italy
3
Technische Universität München, TUM School of Natural Sciences, Physics Department, James-Frank-Straße 1, 85748 Garching bei München, Germany
4
Simon Fraser University, Department of Physics, 8888 University Dr, Burnaby V5A 1S6, Canada
Received:
19
March
2024
Accepted:
5
April
2024
Aims. We calculate the contribution to the neutrino background from the non-jetted active galactic nuclei (AGN) population following the recent IceCube association of TeV neutrinos with NGC 1068.
Methods. We exploited our robust knowledge of the AGN X-ray luminosity function and evolution and converted it to the neutrino band by using NGC 1068 as a benchmark, together with a theoretically motivated neutrino spectrum.
Results. The resulting neutrino background up to redshift 5 does not violate either the IceCube diffuse flux or the upper bounds for non-jetted AGN, although barely so. This is consistent with a scenario in which the latter class makes a substantial contribution mostly below 1 PeV, while jetted AGN, that is, blazars, dominate above this energy, in intriguing agreement with the dip in the neutrino data at ∼300 TeV. More and better IceCube data on Seyfert galaxies will allow us to constrain the fraction of neutrino emitters among non-jetted AGN.
Key words: neutrinos / radiation mechanisms: non-thermal / galaxies: Seyfert
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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