Radio emission from the unbound debris of tidal disruption events.
Radio emission from the unbound debris of tidal disruption events.
复制标题
潮汐破坏事件的未束缚碎片发出的无线电发射。
DOI：
10.1093/mnras/stz1567
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发表时间：
2019
影响因子：
4.8
通讯作者：
Krolik,JH
中科院分区：
文献类型：
--
作者：
Yalinewich,A;Steinberg,E;Piran,T;Krolik,JH
当一颗星星太靠近一个超大质量黑洞时，它会被潮汐力撕裂。大约有一半的恒星质量变得不受束缚，并以大约104 km s-1的速度飞离。在这项工作中，我们探讨的想法，产生的冲击与环境介质的相互作用的未绑定的碎片引起的同步辐射在几个潮汐破裂事件（TDE）中观察到的。利用动网格数值模拟方法研究了未束缚碎片及其周围弓形激波的演化过程，发现随着星星近点距离的减小，外流速度变快，范围变宽。近点距离比潮汐半径小7倍的TDE可以解释ASASSN-14 li观测到的射电辐射。该模型还使我们能够更准确地估计ASASSN-14 li主星系中心周围的气体密度。
When a star gets too close to a supermassive black hole, it is torn apart by the tidal forces. Roughly half of the stellar mass becomes unbound and flies away at tremendous velocities – around 104km s−1. In this work, we explore the idea that the shock produced by the interaction of the unbound debris with the ambient medium gives rise to the synchrotron radio emission observed in several tidal disruption event (TDE). We use a moving mesh numerical simulation to study the evolution of the unbound debris and the bow shock around it. We find that as the periapse distance of the star decreases, the outflow becomes faster and wider. A TDE whose periapse distance is a factor of 7 smaller than the tidal radius can account for the radio emission observed in ASASSN-14li. This model also allows us to obtain a more accurate estimate for the gas density around the centre of the host galaxy of ASASSN-14li.