Robin Shelton (University of Georgia USA)

High Velocity Clouds of Gas Traveling into and through Galaxies
When May 24, 2017 from 02:00 PM to 03:00 PM
  • Special Seminar
  • Colloquium
Where SH, Lecture hall
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Astronomical observations have found enormous and fast-moving gas clouds near the Milky Way Galaxy and near other large spiral galaxies.  Some are near the rarefied outskirts of their host galaxy, while others are poised to collide with the disk.  With speeds in excess of 100 km/sec and masses that can easily exceed a million solar masses, they can bring both distruptive power and fresh material to a galaxy.    My group has been computationally modeling these fast-moving clouds, called high velocity clouds (HVCs).  In various simulations, we consider the effects of dark matter,  magnetic fields, and non collisional ionizational equilibrium of the metal atoms.   Our goal is determine how HVCs interact with galaxies.   In this presentation, I will show how HVCs evolve on timescales of hundreds of millions of years as they travel through the circumgalactic and halo regions and through galactic disks, and how they seed the halo with warm gas, condense and capture halo material, and punch holes in the galactic disk.