arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.20969astro-ph.HE
收藏

射电星系冠状体作为PeV能级扩散中微子起源

Turbulent AGN coronae as the origin of diffuse neutrinos up to PeV energies

School of Astronomy and Space Science, Nanjing University(南京大学天文与空间科学学院);Key laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education(现代天文学和天体物理学教育部重点实验室(南京大学));Tianfu Cosmic Ray Research Center(天府宇宙线研究中心)

Qi-Rui Yang, Ruo-Yu Liu, Xiang-Yu Wang

AI总结:

研究射电星系冠状体湍流加速机制,探讨其在解释PeV能级扩散中微子贡献中的作用,发现高磁化参数可使中微子能量达到PeV级。

摘要:

已证明射电星系冠状体的湍流加速可解释部分AGN的1-10 TeV中微子,如NGC 1068。基于此,尝试用AGN群体累积贡献解释IceCube观测到的扩散中微子,但发现最大中微子能量低于十倍TeV,需额外来源解释更高能级部分。最近,由于NGC 7469探测到>100 TeV中微子,发现冠状体湍流加速可解释>100 TeV中微子,需更大磁化参数(σ≈1)。本文扩展此假设至AGN群体,研究宽范围磁化参数的AGN群体是否能解释整个扩散中微子通量。发现若AGN群体中显著比例具有σ≈1-10的磁化参数,冠状体可解释至PeV能级的扩散中微子。此结论对磁化参数分布形状不敏感,只要磁化参数范围足够宽且高磁化区域分布平坦。有趣的是,此模型也可解释扩散中微子谱在约30 TeV处的峰值。

英文摘要:

It has been shown that the turbulence acceleration in AGN coronae can account for 1-10 TeV neutrinos from some AGNs, such as the Seyfert galaxy NGC 1068. Based on this, there are attempts to explain the diffuse neutrinos observed by IceCube with the accumulated contribution from a population of AGNs, but it is found that the maximum neutrino energy is less than tens of TeV, and as a result, additional source classes are needed to explain the high-energy component above this energy. Recently, motivated by the detection of $>100$ TeV neutrinos from the Seyfert galaxy NGC 7469, it was shown that the turbulence acceleration in the corona can explain $>$100 TeV neutrinos given a larger magnetization parameter ($σ\sim 1$) in the corona, which leads to a larger maximum proton energy and a hard proton spectrum. In this paper, we extend this assumption to the population of AGNs and study whether the population of AGNs with a wide range of magnetization can explain the entire diffuse neutrino flux. We find that AGN coronae could account for the diffuse neutrinos up to PeV energies if a significant fraction of AGNs have magnetizations as large as $σ\sim 1-10$. This conclusion is insensitive to the shape of the magnetization parameter distribution as long as the range of the magnetization parameter is sufficiently wide and the distribution is flat towards high magnetization. Interestingly, this model can also explain the peak of the diffuse neutrino spectrum at $\sim30$ TeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑