Radio observations of the tidal disruption event XMMSL1 J0740$-$85
K. D. Alexander, M. H. Wieringa, E. Berger, R. D. Saxton, S. Komossa

TL;DR
This paper reports radio observations of the tidal disruption event XMMSL1 J0740-85, revealing non-relativistic outflows and providing insights into the circumnuclear environment of the host galaxy.
Contribution
First detection of radio emission from XMMSL1 J0740-85, the nearest TDE with radio data, and analysis suggesting non-relativistic outflows and circumnuclear density measurement.
Findings
Radio emission fades over time, indicating non-relativistic outflows.
Radio luminosity rules out powerful relativistic jets like in Swift J1644+57.
Circumnuclear density estimated at about 100 cm$^{-3}$.
Abstract
We present radio observations of the tidal disruption event candidate (TDE) XMMSL1 J074085 spanning 592 to 875 d post X-ray discovery. We detect radio emission that fades from an initial peak flux density at 1.6 GHz of mJy to mJy suggesting an association with the TDE. This makes XMMSL1 J074085 at Mpc the nearest TDE with detected radio emission to date and only the fifth TDE with radio emission overall. The observed radio luminosity rules out a powerful relativistic jet like that seen in the relativistic TDE Swift J1644+57. Instead we infer from an equipartition analysis that the radio emission most likely arises from a non-relativistic outflow similar to that seen in the nearby TDE ASASSN-14li, with a velocity of about km s and a kinetic energy of about erg, expanding into a medium with a density of about …
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