banner8 banner8_m

News and Events

PAST EVENTS

BACK
Seminars

Public Seminar of RPg Student:
Rates of tidal disruption events around intermediate mass black holes and the effect of stellar profile

Speaker Ms. Nok Yan CHANG
Affiliation The University of Hong Kong
Date February 22, 2022 (Tuesday)
Time 11:00 a.m.
Zoom Link https://hku.zoom.us/j/98015886609?pwd=YW1Ec0cvYXFMb0x1ZXJES1dxK3dBZz09
Meeting ID: 980 1588 6609
Password: 243650

Abstract

Tidal disruption events (TDE) can contribute to probing intermediate mass black hole (IMBH) which allows a better understanding on the process of super massive black hole seed formation. With the dynamical measurements of the BH mass and surface density profile available, the theoretical TDE rate of a sample of 21 IMBH is computed.  Out of the 21 IMBH, 14 are from dwarf galaxies, and 7 from globular clusters. Compared to the TDE rate of the Milky Way of ~ 1e-4/yr, the sample of IMBHs in dwarf galaxies has higher TDE rate with an average rate of 6e-3/yr; whist the 7 in globular cluster has lower TDE rate, with average at 1e-7/yr.  A positive correlation between TDE rate and influence density is shown, and the steepness of the stellar density profile is also shown to have an effect on how TDE rate changes with BH mass. As the BH mass shifts towards lower masses, TDEs will shift to be dominated by low beta events. 

Anyone interested is welcome to attend.