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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-5050
DTSTART:20190311T203000Z
DTEND:20190311T220000Z
DTSTAMP:20260419T085203Z
LAST-MODIFIED:20190218T174955Z
LOCATION:4421 Sterling Hall\, 3:30 PM Coffee and cookies\, 3:45 PM Tal
 k Begins
SUMMARY:Decoding the Magnetic Universe\, Astronomy Colloquium\, Ann Ma
 o \, Max Planck Institute for Radioastronomy
DESCRIPTION:Dynamically important magnetic fields have been shown to p
 lay pivotal roles in processes that are closely linked to galaxy evolu
 tion\, such as disk-halo interaction\, gas accretion and galactic-scal
 e outflows in local galaxies. However\, how galaxies and their magneti
 c fields have co-evolved since the early Universe remains an unsolved 
 fundamental question in astro-plasma physics and cosmology due to the 
 lack of galactic magnetic field measurements beyond the local Universe
 . <br>
\n<br>
\nIn this talk\, I will first describe how the advent of
  broadband radio polarimetry is revolutionizing the field of cosmic ma
 gnetism by enabling unambiguous and precise polarization measurements.
  Moreover\, these broadband polarization data allow one to derive magn
 etized gas properties that were impossible to obtain in the past with 
 narrowband data and these new data are now shedding new light on galac
 tic magnetic fields near and far. <br>
\n<br>
\nI will then demonstrat
 e how broadband polarimetry\, in combination with innovative observati
 onal methods can allow us to\, for the first time\, robustly measure m
 agnetic fields in galaxies in previously uncharted redshift regimes. I
  will present the first results from our campaign\, including our reco
 rd-holder detection of coherent magnetic fields in a disk galaxy as se
 en 4.6 Gyrs ago\, with similar field strength and geometry to local ga
 laxies. This is the most distant galaxy to-date with a robust magnetic
  field measurement and it is consistent with mean-field dynamo generat
 ed fields already in place when the Universe was 2/3 of its current ag
 e.  I will describe our efforts to interpret the observed magnetic fie
 lds in distant galaxies by producing synthetic polarimetric observatio
 ns from dynamo theories and cosmological magneto-hydrodynamics simulat
 ions.<br>
\n<br>
\nTo conclude\, I will discuss exciting prospects of 
 decoding the origin and evolution of galactic magnetic fields with Squ
 are Kilometre Array pathfinders and the next generation radio telescop
 es.
URL:https://www.physics.wisc.edu/events/?id=5050
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