题目：Multi-mission view of extragalactic black hole X-ray binaries LMC X-1 and LMC X-3

　　报告人：陆天羿（紫台研究生）

　　摘要：Study of the measurement of black hole(BH) spin and the observation of light curve from a disc around a Kerr BH is helpful for us to understand the Kerr metric. In this study, we consider multi-mission (MAXI, NICER, NuSTAR and AstroSat) X-ray observations of LMC X-1 and LMC X-3, which are two extragalactic black hole X-ray binaries. Their spins are measured from Iron line(Fe-line fitting method) and cold optical thick disc located in outer regions(continuum-fitting method) by their spectral. Then in case of LMC X-1, spin is estimated to be within 0.85-0.94 and in case of LMC X-3 its value is in range 0.16-0.33. Study of long term MAXI lightcurve shows that the flux of LMC X-1 is stable whereas that of LMC X-3 is unstable in 2？10 keV which is associated with the change in spectral state. Lense-Thirring precession may be used to explain the flux variability . The accretion rate was also be calculated from bolometric luminosity(0.1 - 50 keV).

　　时间：2021年10月19日星期二12:00

　　地点：紫台3-302会议室

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