Dr. Michael Dahlem (ATNF)

Gaseous halos of spiral galaxies - Dr. Michael Dahlem Colloquium

ATNF Marsfield Lecture Theatre

Abstract

It is by now firmly established that gaseous halos are natural
extensions of the ISM in actively star-forming spiral galaxies.
Emission from different gas phases has been detected and a
dependence of halo properties on the star formation activity
in the underlying disks established. The contemporaneous
detection of several gaseous phases raises a few interesting
questions about the excitation and propagation of halo gas.
I will address some of these questions and also point out why
gaseous halos can have an important influence on the chemical
evolution of galaxies and on the metal enrichment of the
intergalactic medium.