ITC Colloquium - Kimitake Hayasaki (Chungbuk National University)


Thursday, February 3, 2022, 11:00am to 12:00pm


"High-energy neutrino emission associated with tidal disruption events"

Tidal disruption events (TDEs) are a good probe of supermassive black holes (SMBHs) at the center of inactive galaxies. A star approaches the SMBH in a parabolic orbit, is destroyed by the SMBH tidal force. The disrupted remnant falls back to the SMBH, producing a characteristic flare that lasts for several months. Recent multi-wavelength and multi-messager observations have revealed the diversity of TDEs. In fact, three unusual TDE candidates (AT2019dsg, AT2019fdr, and AT2019aalc) shine brightly in optical and UV with strong dust echo but weak radio emissions and show the temporal and spatial association with sub-PeV scale neutrinos detected by IceCube. This multi-message nature has given a motivation to consider the mechanism of high-energy neutrino emission from TDEs. This talk will arrange the current status and issues about the association between TDEs and IceCube neutrinos ​and introduce a few consistent models for explaining high-energy neutrino emissions from TDEs.
See also: Colloquium, 2021-22