arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2204.09339astro-ph.HE
收藏

超大质量黑洞磁层的能量相关味比、级联/径迹谱张力和高能中微子

Energy-dependent flavor ratios, cascade/track spectrum tension and high-energy neutrinos from magnetospheres of supermassive black holes

Kirill Riabtsev, Sergey Troitsky

摘要:

冰立方中微子天文台通过各种技术测量高能天体物理中微子的扩散通量,在不同的分析中获得的光谱之间存在轻微的张力。由μ子径迹重建得到的谱比由电子和τ中微子主导的级联谱更难。如果得到证实,这种张力可能会为这些中微子的起源提供线索,这仍然不确定。在这里,我们调查的可能性,这种紧张局势可能是由变化的味道含量的天体物理中微子的能量。我们假设,在更高的能量,流量包含更多的μ子中微子比预期的通常假设味均分。如果中微子产生的磁场区域非常强,以至于π介子衰变产生的μ介子在同步辐射的作用下冷却的速度比衰变快,就可能发生这种情况。该机制需要$\sim 10^4 G$的磁场才能与IceCube结果相关。我们注意到,这些字段值是可达到的活动星系核中的超大质量黑洞附近,并提出了一个工作玩具模型的人口这些潜在的中微子源。虽然这个模型预测了所需的味道比并描述了高能光谱,但它需要一个额外的组件来解释在较低能量下观察到的中微子通量。

英文摘要:

The IceCube neutrino observatory measures the diffuse flux of high-energy astrophysical neutrinos by means of various techniques, and there exists a mild tension between spectra obtained in different analyses. The spectrum derived from reconstruction of muon tracks is harder than that from cascades, dominated by electron and tau neutrinos. If confirmed, this tension may provide a clue to the origin of these neutrinos, which remains uncertain. Here we investigate the possibility that this tension may be caused by the change of the flavor content of astrophysical neutrinos with energy. We assume that at higher energies, the flux contains more muon neutrinos than expected in the usually assumed flavor equipartition. This may happen if the neutrinos are produced in regions of the magnetic field so strong that muons, born in pi-meson decays, cool by synchrotron radiation faster than decay. The magnetic field of $\sim 10^4 G$ is required for this mechanism to be relevant for the IceCube results. We note that these field values are reachable in the immediate vicinity of supermassive black holes in active galactic nuclei and present a working toy model of the population of these potential neutrino sources. While this model predicts the required flavor ratios and describes the high-energy spectrum, it needs an additional component to explain the observed neutrino flux at lower energies.

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。

↑