|The Australia Telescope National Facility Colloquium|
|15:00-16:00 Thu 10 May 2012|
Marsfield Lecture Theatre
Gaseous Halos of Spiral Galaxies -- Peter Kamphuis Colloquium
The properties of gas in the halos of galaxies constrain global models of the interstellar medium. Studies of the extra-planar ionized hydrogen as well as the neutral hydrogen have shown that gaseous halos can improve our understanding of the disk-halo interaction, accretion from the IGM and global magnetic fields; these are key elements in galaxy evolution. Kinematical information is of particular interest since it provides clues to the origin of the gas and helps to disentangle projection effects. Such kinematical studies have shown that the rotational velocities of the gas in massive spiral galaxies decline with increasing distance to the mid-plane, the so-called
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