Bryan Gaensler (University of Sydney)

Radio Polarimetry & the Magnetic Universe - Bryan Gaensler colloquium

ATNF Marsfield Lecture Theatre

Abstract

The evolution, structure and origin of magnetic fields are still
open problems in physics and astrophysics. When and how were the
first fields generated? Are present-day magnetic fields the result
of standard dynamo action, or do they represent rapid or recent
field amplification through other processes? What role do magnetic
fields play in turbulence, cosmic ray acceleration and galaxy
formation? I will explain how radio polarization surveys have the
potential to address these questions. Specifically, I will present
new Faraday rotation studies aimed at revealing the three-dimensional
magnetic structure of the Milky Way, the Magellanic Clouds, distant
galaxies, and the intervening intergalactic medium. These studies
also provide an observational underpinning for the dense "rotation
measure grid" that will be mapped with the next generation of radio
interferometers.