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Extended regions of accretion disks around supermassive black holes in bright AGNs are prone to gravitational instability, star formation and stellar dynamical evolution with feedback to the disks' structure. Spectroscopic data provide vital clues on the stellar and residual black hole populations. Their dynamical interaction with each other, their natal disks, and other massive companions in active and dormant galactic nuclei is remarkably analogous to that in the context of planet formation, evolution, and solar system dynamics. These processes contribute to the observed brightness and spectral-energy distribution of AGN disks and the kinematic properties of the nuclear cluster in the Galactic Center. They also lead to the prolific production and coalescence of black holes as candidates for some gravitational wave events.
Douglas Lin, Professor of Astronomy and Astrophysics, University of California Santa Cruz (1979-), American Academy of Arts and Sciences (2002), Founding Director, Kavli Institute for Astronomy and Astrophysics Peking University (2007-2011), Distinguished Visiting Professor, Tsinghua University (2018-), Rotating Chair, Election Committee, Future Science Prize (2022). Research
contributions include: planet and star formation and dynamics; theory of accretion disks; formation and dynamical evolution of stellar clusters; interacting galaxies; active galactic nuclei and black holes; gravitational waves. Honors include Brouwer award, Division of Dynamical Astronomy, American Astronomical Society (2014), Catherine Wolfe Bruce gold medal, Astronomical Society of the Pacific (2015), Asteroid 25133 Douglin. His work on the migration
of hot Jupiter was extensively cited in the background information for the 2019 Nobel prize in physics.