论文标题
准垂直冲击加速度和TDE无线电耀斑
Quasi-perpendicular shock acceleration and TDE radio flares
论文作者
论文摘要
光学潮汐破坏事件（TDE）的延迟无线电耀斑表明存在于TDE的非相关外流。 TDE与周围环核介质的相互作用在存在环形磁场的情况下会产生准垂直冲击。由于较大的冲击倾斜度和较大的流出速度，我们发现TDE流出引起的冲击加速度通常会导致陡峭的粒子能谱，其功率法指数明显大于平行冲击的“通用”指数。最近检测到的TDE无线电耀斑的测得的同步子光谱指数与我们的理论期望一致。它表明，准垂直冲击处的粒子加速度可以是延迟TDE的无线电发射的一般加速机制。
Delayed radio flares of optical tidal disruption events (TDEs) indicate the existence of non-relativistic outflows accompanying TDEs. The interaction of TDE outflows with the surrounding circumnuclear medium creates quasi-perpendicular shocks in the presence of toroidal magnetic fields. Because of the large shock obliquity and large outflow velocity, we find that the shock acceleration induced by TDE outflows generally leads to a steep particle energy spectrum, with the power-law index significantly larger than the "universal" index for a parallel shock. The measured synchrotron spectral indices of recently detected TDE radio flares are consistent with our theoretical expectation. It suggests that the particle acceleration at quasi-perpendicular shocks can be the general acceleration mechanism accounting for the delayed radio emission of TDEs.
