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Radio Properties of Tidal Disruption Events
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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.
Forward citations
Cited by 5 Pith papers
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Triple radio flares from tidal disruption events: jet-wind collisions and the discovery of a third radio flare from AT2020vwl
The TDE AT2020vwl showed a third radio flare at the time a jet-wind collision was predicted from its first two flares, the first predicted-and-confirmed third flare.
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AT2019ijn: a fast-rising, slow-decaying blue optical transient with exceptionally bright radio emission
AT2019ijn combines LFBOT-like fast optical rise and blue color with slow decay and radio luminosity peaking late at 2e31 erg/s/Hz, best fit as an off-axis jetted IMBH TDE.
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The Radio Properties of Extreme Coronal Line Emitters: Constraints on the Sub-parsec Environment
About half of low-redshift ECLEs are radio-bright like TDEs/AGN; SED modeling of four shows the ECL gas is clumpy (f_V ~ 10^{-5}-10^{-2}) and spatially distinct from the radio-emitting region.
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Continued Rapid Radio Brightening of the Tidal Disruption Event AT2018hyz
AT2018hyz's radio emission kept rising through 2160 days after disruption to about 10^40 erg/s with a stable peak frequency near 3 GHz, consistent with a delayed ~0.3c outflow or a highly off-axis relativistic jet.
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Tidal Disruption Events with the SKA
With its projected sensitivity, low-frequency coverage, and VLBI, the SKA would shift tidal disruption event radio studies from a handful of events to hundreds, enabling population-level inference on jets, black-hole ...
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