Colloquium on Nov. 22nd, 2018: Spin Evolution of Massive Black Holes in Galactic Centers

Speaker:陆由俊（国家天文台）/ Youjun Lu(NAOC)

Venue:Gewu 4410

Time:3:00 PM, Thursday, 22nd November, 2018

Abstract:Massive Black Holes (MBHs) in galactic centers are believed to be described by the Kerr metric with only two physical parameters (mass and spin; no-hair theorem). The distribution of those MBHs on the mass and spin plane contains rich information on the MBH growth history. In this talk, I will report our recent investigations on the spin evolution of MBHs under various accretion processes. We show that different accretion modes (e.g., coherent, chaotic, or tidal star accretion) result in quite different spin distribution. Assuming a two phase accretion model, an initial coherent accretion followed by a later chaotic accretion phase, we use the current available spin measurements to obtain constraints on the MBH growth history. I will also talk about the correlation between the radiative efficiency of QSOs and the MBH mass.

Personal Information:

陆由俊，现为中国科学院国家天文台引力波天体物理研究团组首席研究员，中国科学院大学岗位教授。1992年毕业于安徽大学物理系，1997年获中国科学技术大学天体物理博士学位。1997-1999年任教于中国科学技术大学，1999-2008在普林斯顿大学、加拿大理论天体物理研究所、加州大学伯克利分校、圣克鲁兹分校等地做访问学者或Research Fellow。2008年后就职于中国科学院国家天文台任研究员。主要研究兴趣和领域为理论天体物理，包括黑洞物理、引力波天体物理、活动星系核和类星体、星系宇宙学等。