论文标题
在潮汐破坏事件中碰撞恒星流冲击的光学极化
Optical polarization from colliding stellar stream shocks in a tidal disruption event
论文作者
论文摘要
当超级质量的黑洞撕开传球之星时，就会发生潮汐破坏事件（TDE）。恒星材料的一部分落入黑洞，形成了一个积聚磁盘，在某些情况下会引发相对论的喷气机。我们在2020 mot上进行了TDE的光学偏振法观测值。我们发现峰值线性极化度为$ 25 \ pm4 $％，与高度极化的同步子辐射一致，这是相对论喷气机通常观察到的。但是，我们的无线电观察结果在光峰后长达8个月进行，无法检测到相对论射流预期的相应无线电发射。我们建议，随着恒星材料的流与自身的碰撞，线性两极化的光学发射是由积聚盘形成过程中发生的冲击引起的。
A tidal disruption event (TDE) occurs when a supermassive black hole rips apart a passing star. Part of the stellar material falls toward the black hole, forming an accretion disk that in some cases launches a relativistic jet. We performed optical polarimetry observations of a TDE, AT 2020mot. We find a peak linear polarization degree of $25\pm4$%, consistent with highly polarized synchrotron radiation, as is typically observed from relativistic jets. However, our radio observations, taken up to 8 months after the optical peak, do not detect the corresponding radio emission expected from a relativistic jet. We suggest that the linearly polarized optical emission instead arises from shocks that occur during accretion disk formation, as the stream of stellar material collides with itself.
