학과 세미나

콜로키움

2021년 4월 22일 세미나 공고
2021년 4월 22일 세미나 공고
작성자 천문우주과학과
조회수 379 등록일 2021.04.09

일시:  2021년 4월 22일 목요일 오후 4시 세미나실(기2514호)
       (ZOOM 회의 ID:878 6419 6027)


연사:  홍종석 박사님(한국천문연구원)

 

제목: Black hole binaries originating from globular clusters and their gravitational wave events


 초록:  

Globular clusters (GCs) provide a good environment for the formation of black hole binaries (BBHs), some of which can merge with gravitational waves (GW) within the age of the Universe. We have performed a survey of Monte-Carlo simulations to explore the impact of host GC properties on the formation and detection of BBH mergers originating from GCs. We find that the number of BBH mergers from GCs is influenced by not only the initial mass but also the initial half-mass radius and primordial binary fraction of GCs. BBH mergers can be identified by their origins, primordial and dynamical BBH mergers, significantly affecting their properties such as the mass and merging time distributions. In this talk we will provide some empirical relations like the expected number of BBH mergers from individual GCs and the time evolution of merger rates of these BBHs, which can be used to estimate the detection rates. If time permits, I also want to introduce the effects of intermediate mass black holes, which may exist in some massive GCs, on the merger population and detection rates