Joaquin Pelle - Electromagnetic signals from black hole-disk collisions

Friday 12 Dec 2025, 10:30 → 12:00 Europe/Berlin

Galactic nuclei are expected to host stellar- and intermediate-mass black holes orbiting the central supermassive black hole. In the presence of an accretion disk, either in an AGN or following a TDE, collisions between these orbiting black holes and the disk can power very luminous transients. Recently, using relativistic hydrodynamical simulations, we have shown that the long-term post-collision accretion onto the secondary black hole may dominate the emission over that from the initially shocked and ejected material. In this talk, I will present luminosity and spectral estimates derived from our simulations for this type of transient and discuss their observability.