Speaker
Description
Tidal disruption events (TDEs) occur when a star is torn apart by the immense tidal forces emanating from a supermassive black hole (SMBH). These events serve as dynamic laboratories for studying dormant SMBHs, their environments, and the physical processes associated with SMBHs, including the formation of accretion flows. Among the numerous enigmatic phenomena associated with TDEs, a relatively recent discovery is the occurrence of delayed X-ray and radio flares. Numerous events have been observed exhibiting sudden X-ray and radio emission at exceptionally late times, spanning from hundreds of days to several years after the initial tidal disruption. Notably, optical flaring has not been consistently associated with these flares. The origin of these delayed flares remains elusive, but several hypotheses have been proposed, including transitions in accretion states, the presence of large viewing angle off-axis jets, and recurring disruptions. The temporal and spectral characteristics of these delayed flares exhibit remarkable diversity, suggesting that they may be driven by a diverse range of processes. In my presentation, I will review several such flares that we recently observed concurrently with the Swift (X-ray) and AMI (radio) telescopes. Our initial findings, indicate a strong correlation between X-ray and radio emission in some of these events, implying a potential common mechanism.
