Astro Seminar: Suvi Gezari
Date and Time: Monday, March 3 at 2:15 PM
Speaker: Suvi Gezari (Space Telescope Science Institute and Johns Hopkins University)
Place: Auditorium A
Title: The Search for the Tidal Disruption of Stars from Massive Black Holes Over Cosmic Time
Abstract: The tidal disruption of a star that wanders too close to a central black hole is a unique probe of quiescent supermassive black holes lurking in the nuclei of galaxies. Over the last 5 years, we have demonstrated the ability to discover and spectroscopically classify large samples of tidal disruption events (TDEs) in the optical from the Zwicky Transient Facility (ZTF) Northern Sky Survey, with systematic high-energy follow-up with Swift and XMM-Newton. From these efforts, we now know the spectroscopic signatures, multi-wavelength properties, and host galaxy preferences of TDEs, and can begin to use TDEs as powerful probes of massive black hole demographics and accretion physics. I will present intriguing evidence for TDEs as a potential source of very high energy neutrinos, and their promise as multi-messenger sources of low-frequency gravitational waves. One of the most exciting applications of TDEs is the ability to probe intermediate mass black holes (IMBHs) that are expected to reside in dwarf galaxies, with demographics that encode the seeding mechanism of massive black holes in the early Universe. I will outline our strategy in the next decade for searching for TDEs across the black hole mass function, and over cosmic time, by extending our sensitivity to TDEs to lower central black hole masses and higher redshifts, by exploiting the discovery power of the next generation of wide-field time domain surveys, including Rubin, Roman, ULTRASAT, and UVEX.