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arXiv 2401.07580astro-ph.HE
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赛弗特星系日冕宇宙线能量预算的上限

Upper Limit on the Coronal Cosmic Ray Energy Budget in Seyfert Galaxies

Yoshiyuki Inoue, Shinsuke Takasao, Dmitry Khangulyan

AI总结:

该研究结合吸积动力学与射电宁静赛弗特星系观测性质,给出日冕宇宙线能量预算的新严格上限,并发现其难以解释NGC 1068的IceCube中微子信号。

摘要:

IceCube合作组报告了可能探测到来自邻近赛弗特星系的高能中微子。尽管中央热日冕被认为是主要的中微子产生场所,但确切的日冕宇宙线能量预算一直受到较弱约束。在本研究中,我们同时考虑吸积动力学和射电宁静赛弗特星系的观测性质,提出了一个新的、严格的赛弗特星系日冕宇宙线能量预算上限。值得注意的是,即使在宇宙线损失全部能量的量热条件下,我们的限制也表明,NGC 1068的日冕中微子通量比观测水平低约一个数量级。这一差异表明,需要对来自赛弗特星系的IceCube信号进行进一步的理论和观测研究。

英文摘要:

The IceCube collaboration has reported possible detections of high-energy neutrinos from nearby Seyfert galaxies. While central hot coronae are proposed as the primary neutrino production site, the exact coronal cosmic-ray energy budget has been loosely constrained. In this study, we propose a new stringent upper bound on the coronal cosmic-ray energy budget of Seyfert galaxies, considering both accretion dynamics and observed properties of radio-quiet Seyfert galaxies. Notably, even under the calorimetric condition where cosmic rays lose all their energies, our limit indicates that the coronal neutrino flux of NGC~1068 is about an order of magnitude fainter than the observed levels. This discrepancy suggests the need for further theoretical and observational investigations on the IceCube signals from Seyfert galaxies.

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