Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 761, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/761/1/L11
Keywords
cosmic rays; Galaxy: general; ISM: magnetic fields; magnetic fields
Categories
Funding
- NASA [NNX10AC96G]
- [NSF-PHY-0701451]
- NASA [135871, NNX10AC96G] Funding Source: Federal RePORTER
- Direct For Mathematical & Physical Scien
- Division Of Physics [1212538, 0970075] Funding Source: National Science Foundation
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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 40,000 extragalactic Faraday rotation measures and the WMAP7 22 GHz polarized and total intensity synchrotron emission maps. The data call for a striated component to the random field whose orientation is aligned with the regular field, having zero mean and rms strength approximate to 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. The new GMF model gives a much better description of the totality of data than previous models in the literature.
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