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The Galactic Magnetic Field · Around

2012

The Galactic Magnetic Field

Jansson, Ronnie, Farrar, Glennys R.

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With this Letter, we complete our model of the Galactic magnetic field (GMF), by using the WMAP7 22 GHz total synchrotron intensity map and our earlier results to obtain a 13-parameter model of the Galactic random field, and to determine the strength of the striated random field.

In combination with our 22-parameter description of the regular GMF, we obtain a very good fit to more than forty thousand extragalactic Faraday Rotation Measures (RMs) and the WMAP7 22 GHz polarized and total intensity synchrotron emission maps.
The data calls for a striated component to the random field whose orientation is aligned with the regular field, having zero mean and rms strength ~20% larger than the regular field.
A noteworthy feature of the new model is that the regular field has a significant out-of-plane component, which had not been considered earlier.

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