Random flows and rotation in galactic coronae

by Anvar Shukurov (Newcastle University)

Tuesday 5 Jan 2021, 15:00 → 16:00 Europe/Stockholm

https://stockholmuniversity.zoom.us/j/940229961

Galactic coronae are extended gas envelopes around the discs of spiral galaxies filled with a hot, rarefied gas produced by supernovae in the disc. They contain cosmic rays and magnetic fields and provide a reservoir for the magnetic helicity transported from the disc by the fountain flow. The nature and parameters of the turbulence and rotation in the coronae are poorly known and the existing rotation models do not explain the limited observations available. We discuss the sources of random motions in the coronae and ague that the gas is so viscous that a developed turbulence cannot be maintained. We suggest that the observations are compatible with the diffusive spread of vorticity from the disc.

Shukurov_2021-Jan-05.mp4