Speaker
Description
Directly resolving the gas distribution in galactic nuclei are challenging, but radio‑bright nuclear transients—especially tidal disruption events (TDEs)—offer a powerful indirect probe. Our three‑dimensional hydrodynamic simulations show that the interaction between a TDE outflow and the circumnuclear medium (CNM) produces radio light curves whose shapes reveal the CNM density profiles. Furthermore, bumpy gas or torus structures in the galactic nucleus imprint distinctive features on the radio emission. We also demonstrate that supernovae exploding near a supermassive black hole can undergo tidal distortion and circularization of their expanding ejecta, forming a new accretion disk and generating very luminous nuclear transients. These findings offer new approaches to exploring both the gas environment and stellar activity in galactic nuclei.