Events Daily

Wednesday, June 14, 2023

Tidal Disruption Events: Hosts, Rates, and Echoes
Or Graur, University of Portsmouth
Event Type: Special Seminar
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: Tidal disruption events are luminous, transient flares that occur when a star strays past the tidal radius of a supermassive black hole (SMBH) and is torn apart by the SMBH's gravitational field. These transients, predicted in the 70s, are now routinely discovered in optical, wide-field surveys. However, they are rare, and only ~100 such objects have been discovered to date. In my talk, I will describe what we know about the host galaxies of these events and how they relate to their formation mechanism. I will then describe how tidal disruption events can be discovered in spectroscopic surveys, such as SDSS and DESI, by searching for high-ionization iron lines. Tidal disruption events are now only interesting as a new type of transient, they are also useful probes of SMBH/AGN physics and evolution. I will show several examples of such uses, including as an X-ray machine of the gas in the vicinity of SMBHs.

Link to the Event Video