Radio observations of tidal disruption events (TDEs) probe material ejected by the disruption of stars by supermassive black holes (SMBHs), uniquely tracing the formation and evolution of jets and outflows, revealing details of the disruption hydrodynamics, and illuminating the environments around previously-dormant SMBHs. To date, observations reveal a surprisingly diverse population. A small fraction of TDEs (at most a few percent) have been observed to produce radio-luminous mildly relativistic jets. The remainder of the population are radio quiet, producing less luminous jets, non-relativistic outflows or, possibly, no radio emission at all. Here, we review the radio observations that have been made of TDEs to date and discuss possible explanations for their properties, focusing on detected sources and, in particular, on the two best-studied events: Sw J1644+57 and ASASSN-14li. We also discuss what we have learned about the host galaxies of TDEs from radio observations and review constraints on the rates of bright and faint radio outflows in TDEs. Upcoming X-ray, optical, near-IR, and radio surveys will greatly expand the sample of TDEs, and technological advances open the exciting possibility of discovering a sample of TDEs in the radio band unbiased by host galaxy extinction.

中文翻译：

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潮汐干扰事件的无线电特性

潮汐破坏事件 (TDE) 的无线电观测探测由超大质量黑洞 (SMBH) 破坏恒星所喷射出的物质，独特地追踪喷流和外流的形成和演化，揭示破坏流体动力学的细节，并照亮之前的环境——休眠的 SMBH。迄今为止，观察结果揭示了令人惊讶的多样化人口。已经观察到一小部分 TDE（最多百分之几）会产生射电发光的轻度相对论射流。其余的人口是无线电安静的，产生较少发光的喷流，非相对论流出，或者可能根本没有无线电发射。在这里，我们回顾了迄今为止对 TDE 进行的无线电观测，并讨论了对其特性的可能解释，重点是检测到的源，特别是，关于两个研究最充分的事件：Sw J1644+57 和 ASASSN-14li。我们还讨论了我们从无线电观测中了解到的关于 TDE 宿主星系的知识，并回顾了 TDE 中明亮和微弱无线电流出率的限制。即将进行的 X 射线、光学、近红外和无线电勘测将大大扩展 TDE 的样本，技术进步开启了在不受宿主星系灭绝影响的无线电波段中发现 TDE 样本的令人兴奋的可能性。