BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3248
DTSTART:20140206T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T193830Z
LAST-MODIFIED:20140122T195057Z
LOCATION:4421 Sterling Hall
SUMMARY:Measuring Magnetic Fields Near and Far via the Zeeman Effect\,
  Astronomy Colloquium\, Tim Robishaw\, Dominion Radio Astrophysical Ob
 servatory
DESCRIPTION:The Zeeman effect is the only observational tool that allo
 ws us to directly measure the magnetic field strength and direction in
  the interstellar medium.  We provide an overview of ongoing projects 
 in which we are using the Zeeman splitting of the 21-cm line and the 1
 8-cm hydroxyl (OH) transitions in order to probe astrophysical magneti
 c fields.  We will highlight the first detection of extragalactic Zeem
 an splitting in the OH<br><br>
\nmegamaser emission from starburst gal
 axies.  Results will be shown from a southern survey of Zeeman splitti
 ng in OH masers in our Milky Way's spiral arms that suggest field reve
 rsals relative to the field directions probed by Faraday rotation.  We
  will also discuss previous measurements of the Zeeman effect in Galac
 tic 21-cm radio emission\, some of the instrumental challenges involve
 d in such measurements\, and plans for a large-scale<br><br>
\nsurvey 
 underway on the 64-m Parkes telescope and the 26-m John A. Galt Telesc
 ope at the Dominion Radio Astrophysical Observatory.
URL:https://www.physics.wisc.edu/events/?id=3248
END:VEVENT
END:VCALENDAR