Search for VHE gamma-ray emission from the TDE AT 2021uqv with H.E.S.S.

Tidal Disruption Events (TDEs) are a relatively young class of transient phenomena, which occur whenever a star approaches a supermassive black hole (SMBH) close enough to be ripped apart by its tidal forces. Part of the stellar debris forms an accretion disk, which in turn may result in a flare of electromagnetic radiation, which is typically detected in optical/UV and X-ray energy bands. Some TDEs have also been detected in radio and non-thermal X-rays, which suggests active particle acceleration to relativistic energies likely in shocks or jets. However, up to now, there are no TDEs detected in gamma rays, neither in the HE (100 MeV- 100 GeV) nor in the VHE (100 GeV- 100 TeV) regime. In 2021, the H.E.S.S. collaboration observed the TDE AT 2021uqv as part of its TDE programme. No significant VHE gamma-ray emission was detected in ∼27 h of observations, and therefore, spectral upper limits are presented. In addition, we also discuss multi-wavelength information available for AT 2021uqv.