Seminars and Journal Clubs

Multi-messenger Signals from Supermassive Black Hole Mergers and Tidal Disruption Events [BEL-center:pheno]

by Dr Chengchao Yuan (DESY)

CYCL01 (Marc de Hemptinne (chemin du Cyclotron, 2, Louvain-la-Neuve))


Marc de Hemptinne (chemin du Cyclotron, 2, Louvain-la-Neuve)

The coincident detection of gravitational waves (GWs) and electromagnetic (EM) counterparts from the binary neutron star merger event GW 170817 heralds a new era in multi-messenger astronomy. At the same time, since the first discovery of the high-energy astrophysical neutrinos in 2012 by IceCube, neutrino astrophysics has made significant progress and has started playing an increasingly important role in multi-messenger analyses. In this talk, I will present our semi-analytical results on the neutrino and EM emissions from supermassive black hole mergers. I will talk about the jet-wind model in the post-merger phase and discuss implications for the ongoing and next-generation optical/gamma-ray, neutrino, and GW missions. 
Furthermore, as another astrophysical phenomenon related to SMBH accretion activity, a tidal disruption event occurs when a massive star passes close enough to a SMBH and is torn apart by the tidal force. In the second part of this talk, I will present the time-dependent neutrino and electromagnetic cascade emission from AT2019dsg, a TDE that is likely associated to the neutrino event IC191001A detected approximately 150 days after the optical/UV peak. Constraints on the maximum injected proton energy and the size of emitting region using X-ray, gamma-ray, and neutrino observations will also be discussed.