Seminar Title |
Black Holes Big and Small: Impact on Galaxy Formation |
Speaker: |
Prof. Luis C. Ho |
Affiliation: |
(Director and University Chair Professor,
Kavli Institute for Astronomy and Astrophysics, Peking University) |
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When: |
Sunday afternoon, May 4th , 16:00 p.m |
Where: |
Feiyiming Building , Room 203 (NJU) |
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Welcome to Attend |
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( PMO Academic Committee & Academic Circulating committee) |
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Abstract
Supermassive black holes (BHs) have been found in 87 galaxies by dynamical modeling of spatially resolved kinematics. The Hubble Space Telescope revolutionized BH research by advancing the subject from its proof-of-concept phase into quantitative studies of BH demographics. Most influential was the discovery of a tight correlation between BH mass and velocity dispersion of the bulge component of the host galaxy. Together with similar correlations with bulge luminosity and mass, this led to the widespread belief that BHs and bulges coevolve by regulating each other's growth. I present a major update to the status of this field. I will discuss (1) how BH mass correlates tightly only with classical bulges and ellipticals, (2) how the zero point and slopes of the fundamental correlations need to be revised, (3) BH mass estimates in quasars and AGNs, (4) the discovery of intermediate-mass BHs in dwarf galaxies and implications for quasar seeds, (5) quasar-mode feedback at high redshifts, and (6) the evolution (or lack thereof) with time of the BH-host galaxy scaling relations.