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Physics Seminar: The Origin and Utility of Changing-Look Quasars
November 20 @ 2:30 pm
Dr. John Ruan,
Department of Physics and Astronomy
Abstract: The proliferation of wide-field multi-epoch imaging surveys has now opened a new window to the time-domain for discovery of new and rare time-variable phenomena. From these surveys, the recent discovery of ‘changing-look’ quasars poses potential challenges to our understanding of accretion onto supermassive black holes. In this phenomenon, luminous quasars suddenly fade into quiescent galaxies over timescales of just a few years, a factor of 10000 faster than expected. I will examine different explanations for the origin of changing-look quasars, and discuss their incredible usefulness in probing accretion physics, supermassive black hole feedback, and galaxy evolution over cosmic time.
If you are interested in joining in this seminar, please email Nancy Robichaud at email@example.com by November 19 to obtain the Zoom link.