Could TDE outflows produce the PeV neutrino events?
Could TDE outflows produce the PeV neutrino events?
复制标题
TDE 流出会产生 PeV 中微子事件吗？
DOI：
10.1093/mnras/stac1621
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发表时间：
2021
影响因子：
4.8
通讯作者：
Zhuo Li
中科院分区：
文献类型：
--
作者：
Han;Guobin Mou;Kai Wang;Wei Wang;Zhuo Li
观测到潮汐破坏事件（TDE） AT2019dsg与PeV中微子事件IceCube-191001A有关，比光学爆发晚了半年。众所周知，tde可能会产生超快的外流。如果TDE发生在多云环境中，则流出云与云之间的相互作用可能形成激波，产生加速的质子，从而从云中的强子相互作用中产生延迟的中微子。在这里，我们通过检查TDE流出-云相互作用模型来研究AT2019dsg中的中微子产生。我们发现，对于速度为0.07c，动力学光度为$10^{45}\rm \ erg\ s^{-1}$的外流，质子可能被弓形激波加速到~ 60 PeV，并通过与云的相互作用产生PeV中微子。该模型预测的中微子数取决于模型参数的不确定性，为了与观测结果相匹配，涉及了一些具有挑战性的参数值。当硬质子指数Γ = 1.5时，PeV中微子事件数可达~ 4 × 10−3。
A tidal disruption event (TDE), AT2019dsg, was observed to be associated with a PeV neutrino event, IceCube-191001A, lagging the optical outburst by a half year. It is known that TDEs may generate ultrafast outflows. If the TDE occurs in a cloudy environment, the outflow-cloud interactions may form shock waves which generate accelerated protons and hence delayed neutrinos from hadronic interactions in clouds. Here we investigate the neutrino production in AT2019dsg by examining the TDE outflow-cloud interaction model. We find that, for an outflow with a velocity of 0.07c and a kinetic luminosity of $10^{45}\rm erg\ s^{-1}$, protons may be accelerated up to ∼ 60 PeV by the bow shocks, and generate PeV neutrinos by interactions with clouds. The predicted neutrino number in this model depends on the uncertainties of model parameters and in order to match the observations, some challenging values of parameters have been involved. The PeV neutrino event number can be ∼4 × 10−3 for a hard proton index Γ = 1.5.