URL: https://physikseminar.desy.de/zeuthen/past_colloquia/colloquia_in_2013/october_30_2013/@@siteview
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GMF: The Galactic Magnetic Field
Glennys Farrar (New York University)
Seminar room 3, 3:00 pm
Knowledge of the global structure of the Galactic magnetic field (GMF) is very hard to obtain, and until recently models have been seriously incomplete. I will describe work done in collaboration with R. Jansson to determine the GMF using Rotation Measures of 40,000 extragalactic sources and the WMAP synchrotron emission maps. To get a good description of that data, we developed a 22-parameter model of the coherent and striated components of the GMF and a 13-parameter model of the random field. The data required use to include features in the model that had been previously overlooked. Implications and open questions will be discussed.
