Clues about the Self-Regulation of Galaxies from Studies of the Circumgalactic Medium
Megan Donahue
Distinguished Professor of Physics and Astronomy at Michigan State University

I will discuss some of the hints about how galaxies self-regulate their own growth and the growth of their central supermassive black hole. These hints are provided by X-ray studies of the hot intergalactic gas in the cores of clusters of galaxies and of the hot circumgalactic gas around massive galaxies, also known as the ?Circumgalactic Medium? or CGM. I will argue that the central velocity dispersion of the stars in massive galaxies seems to be a primary factor in determining when a galaxy essentially ceases making any more stars and in the role of the active galactic nucleus, which works with stars and supernovae to regulate the gas supply of stars and black hole accretion growth. I will also show some new (and rare) Chandra High Resolution Camera data for the hot gas around a powerful radio source, IC4296.

Date:	Jeudi, 10 novembre 2022
Time:	11:30
Where:	Université de Montréal
	Campus MIL salle A3541