Neutrino emissions from tidal disruption events - 물리천문학부 천문학전공

Colloquium

Astronomy Colloquium (2021 Spring Semester)

* Date: Jun 17
* Speaker: Prof. Kimtake Hayasaki(Chungbuk National University)
* Title: Neutrino emissions from tidal disruption events
* Abstract

Tidal disruption events (TDEs) are explosive phenomena that shine brightly from optical to X-rays around supermassive black holes (SMBHs), and therefore provide evidence for dormant SMBHs in the centers of inactive galaxies. TDEs occur when a star on a parabolic orbit approaches close enough to a SMBH to be disrupted by the SMBH’s tidal force. The subsequent super-Eddington accretion of stellar debris falling back to the SMBH produces a characteristic flare lasting several months. This is the standard picture of TDEs. However, recent progress has gradually unveiled the observed diversity of TDEs. Specifically, AT2019dsg is an unusual type of TDE because it shows bright emission from optical to soft-X-ray wavebands as well as weak but observable radio emission. Moreover, AT2019dsg has very recently represented the first potential association of neutrino emission with a TDE. This talk will briefly review the TDE theory and observation and the association of the IceCube neutrino and AT2019dsg. Besides, I will explain high-energy neutrino emissions from accretion flows around the SMBH.

Date	Speaker	Title	Remarks
Mar 11	–	–
Mar 18	–	–
Mar 25	–	–
Apr 01	–	–
Apr 08	–	–
Apr 15	–	KAS Spring Meeting
Apr 22	Dr. Christian Wolf (Australian National University)	The SkyMapper Southern Survey and the bright end of the high-redshift QSO population
Apr 29	Dr. Seo-Won Chang(SNU ARC)	SkyMapper Optical Follow-up of Gravitational Wave Triggers and OzGrav2.0
May 06	Prof. Otto van Koert(SNU Dept. of Mathematics)	Mathematics and the three-body problem
May 13	Dr. Jongho Park(ASIAA Taipei)	Magnetic field structure near the event horizon of the M87 black hole
May 20	Dr. Natascha M. Forster Schreiber(MPE Garching)	Galaxy Evolution at the Peak Epoch of Cosmic Star Formation: Witnessing In-situ the Growth and Transformations of Young Galaxies
May 27	Prof. Woojin Kwon (SNU College of Education)	Magnetic fields of star formation revealed on the intermediate and small scales	Talk in Korean
Jun 03	Dr. Minju Lee(MPE Garching)	Cold gas in high-redshift galaxies
Jun 10	Dr. Jongsuk Hong(KASI)	Stellar dynamics – the complexity of stellar populations and their numerical interpretations
Jun 17	Prof. Kimtake Hayasaki(Chungbuk National University)	Neutrino emissions from tidal disruption events	Special colloquium (after end of semester)

2021 Spring semester detail