The neutrino background from non-jetted active galactic nuclei,Astronomy & Astrophysics

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The neutrino background from non-jetted active galactic nuclei
Astronomy & Astrophysics ( IF 6.5 ) Pub Date : 2024-04-19 , DOI: 10.1051/0004-6361/202450025
P. Padovani , R. Gilli , E. Resconi , C. Bellenghi , F. Henningsen

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.

中文翻译：

来自非喷射活动星系核的中微子背景

目标。根据最近 TeV 中微子与 NGC 1068 的 IceCube 关联，我们计算了非喷射活动星系核 (AGN) 群对中微子背景的贡献。方法。我们利用对 AGN X 射线光度函数和演化的丰富知识，并使用 NGC 1068 作为基准以及理论上驱动的中微子谱将其转换为中微子带。结果。由此产生的中微子背景高达红移 5，既不违反 IceCube 漫射通量，也不违反非喷射活动星系核的上限，尽管勉强如此。这与后一类在 1 PeV 以下做出重大贡献的情况是一致的，而喷射活动星系核（即耀变体）在该能量之上占主导地位，这与中微子数据在~300 TeV 的下降有趣地一致。更多更好的塞弗特星系 IceCube 数据将使我们能够限制非喷射活动星系核中中微子发射体的比例。

更新日期：2024-04-19

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