报告人：

Prof. Kwong Sang Cheng

报告人单位：

The University of Hong Kong

报告时间：

2018年4月17日上午 10：30-11：30

报告地点：

东七楼，四楼427会议室

报告摘要：

Prof Kwong Sang Cheng

1984-87 University of Illinois, U.S.A.Postdoctorate

1987-88 Wollongong University, Australia Lecturer

1988-92 The University of Hong Kong, Hong Kong Lecturer

1992-94 The University of Hong Kong, Hong Kong Senior Lecturer

1994-99 The University of Hong Kong, Hong Kong Professor

1999- Present The University of Hong Kong, Hong Kong Chair Professor

报告人简介：

Gamma-ray binaries are binaries consisting a massive main sequence star and a compact object, which could be either neutron star or black hole. These binary systems have been detected to emit wide range of electromagnetic spectrum from radio to TeV gamma-rays. In particular their radiation loss is dominated in the gamma-ray regime. In this talk I explore some possible scenarios which may be able to explain the time varying emission from X-rays to TeV gamma-rays from the gamma-ray binaries by assuming that the compact objects are neutron stars. Especially I will emphasize on the possibility of forming a transient accretion disk around the neutron star when it is passing through the circum-stellar disk of the main sequence star. The soft photons from the transient accretion disk is expected to produce the transient GeV emission via the inverse Compton scattering with the cold pulsar wind. The interaction between the neutron star and the circum-stellar disk can enhance the X-ray and TeV emission as well.