Radio Emission from Outflow-Cloud Interaction and Its Constraint on TDE Outflow
arXiv:2108.11296 · doi:10.1093/mnras/stab3742
Abstract
Tidal disruption event (TDE) can launch an ultrafast outflow. If the black hole is surrounded by large amounts of clouds, outflow-cloud interaction will generate bow shocks, accelerate electrons and produce radio emission. Here we investigate the interaction between a non-relativistic outflow and clouds in active galaxies, which is manifested as outflow-BLR (broad line region) interaction, and can be extended to outflow-torus interaction. This process can generate considerable radio emission, which may account for the radio flares appearing a few months later after TDE outbursts. Benefitting from efficient energy conversion from outflow to shocks and the strong magnetic field, outflow-cloud interaction may play a non-negligible, or even dominating role in generating radio flares in a cloudy circumnuclear environment if the CNM density is no more than 100 times the Sgr A*-like one. In this case, the evolution of radio spectra can be used to directly constrain the properties of outflows.
8 pages, 4 figures. Accepted for publication in MNRAS
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- Radiative hydrodynamical simulations of super-Eddington accretion flow in tidal disruption event: the accretion flow and wind
- Quasi-perpendicular shock acceleration and TDE radio flares
- X-ray from Outflow-Cloud Interaction and Its Application in Tidal Disruption Events
- What powers the radio emission in TDE AT2019dsg: a long-lived jet or the disruption itself?
- Numerical Studies on the Radio Afterglows in TDE: Forward Shock