The Galactic Center Chimneys and the Galactic Wind

Date: 
Wednesday, April 21, 2021 - 3:30pm PDT
Speaker: 
Mark Morris
Affiliation: 
UCLA
Location: 
Online
Event Type: 
Colloquium

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While there has long been a limited amount of morphological and dynamical evidence for an outflow from the central regions of our Galaxy, the last decade has seen an explosive growth in the evidence for a powerful Galactic wind on all scales, starting with the discovery of the gamma-ray Fermi Bubbles.  While the lower boundaries of the Fermi Bubbles are nested within a hot plasma seen in soft X-rays and in the formof a “microwave haze,” the connection of these large-scale features to activity in the Galactic center was not evident until recent X-ray and radio continuum observations revealed the "Galactic center chimneys” extending a few hundred parsecs out from the center and connecting to the bases of the Fermi Bubbles.  In this talk I will describe what we have learned about these Galactic exhaust channels using a multi-wavelength approach.  I will also describe the recent discovery of a population of relatively dense atomic and molecular clouds that have apparently been accelerated out of the Galaxy’s central molecular zone up to hundreds of km/s by the much faster hot plasma constituting the bulk of the Galactic wind

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