THE GALACTIC MAGNETIC FIELD

被引:248
|
作者
Jansson, Ronnie [1 ]
Farrar, Glennys R. [1 ]
机构
[1] NYU, Dept Phys, Ctr Cosmol & Particle Phys, New York, NY 10003 USA
基金
美国国家科学基金会;
关键词
cosmic rays; Galaxy: general; ISM: magnetic fields; magnetic fields; FARADAY-ROTATION; COSMIC-RAYS; SYNCHROTRON; DISK;
D O I
10.1088/2041-8205/761/1/L11
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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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页数:5
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