High-energy Neutrino Production from AGN Disk Transients Impacted by the Circum-disk Medium
High-energy Neutrino Production from AGN Disk Transients Impacted by the Circum-disk Medium
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DOI：
10.3847/1538-4357/acd380
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Zilu Zhou;Jin-Ping Zhu;Kai Wang
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文献类型：
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作者：
Zilu Zhou;Jin-Ping Zhu;Kai Wang
各种超新星、致密天体合并和潮汐破坏事件被广泛认为发生在活动星系核（AGN）吸积盘中，并产生可探测的电磁信号。我们将它们统称为AGN磁盘瞬变。激波加速宇宙射线与AGN盘物质之间的非弹性强核（pp）相互作用可以产生高能中微子。然而，如果采用适用于稳定气体占主导的圆盘的纯高斯密度大气剖面，预期的中微子产生效率将迅速衰减。另一方面，AGN外流和盘风通常在AGN吸积盘周围发现。在本文中，我们证明了环盘介质将进一步消耗激波动能，以更有效地产生高能中微子，特别是冰立方探测到的~ TeV−PeV中微子。由于环盘介质的存在，我们发现中微子的产生将显著增强，对弥散中微子背景的贡献要大得多。乐观地说，约20%的弥散中微子背景可以由AGN盘瞬态贡献。
Various supernovae, compact object coalescences, and tidal disruption events are widely believed to occur embedded in active galactic nucleus (AGN) accretion disks and generate detectable electromagnetic signals. We collectively refer to them as AGN disk transients. The inelastic hadronuclear (pp) interactions between shock-accelerated cosmic rays and AGN disk materials shortly after the ejecta shock breaks out of the disk can produce high-energy neutrinos. However, the expected efficiency of neutrino production would decay rapidly by adopting a pure Gaussian density atmosphere profile applicable for stable gas-dominated disks. On the other hand, AGN outflows and disk winds are commonly found around AGN accretion disks. In this paper, we show that the circum-disk medium would further consume the shock kinetic energy to more efficiently produce high-energy neutrinos, especially for ∼ TeV−PeV neutrinos that IceCube detects. Thanks to the existence of the circum-disk medium, we find that the neutrino production will be enhanced significantly and make a much higher contribution to the diffuse neutrino background. Optimistically, ∼20% of the diffuse neutrino background can be contributed by AGN disk transients.