Statistical Analysis of Extra-galactic Rotation Measures
نویسندگان
چکیده
We have performed a statistical analysis of a sample of 1100 extra-galactic rotation measures (RMs) obtained from the literature. Using a subsample of approximately 800 reliable RMs we compute a rotation measure sky and determine reliable large scale features for the line of sight Galactic magnetic field. We find that the influence of the Milky Way can be seen up to roughly 30◦ on either side of the Galactic plane. Furthermore we observe an excess of RM on spatial scales between 30◦ and 50◦ in the region of the Galactic Plane. Additionally, the support for a bisymmetric spiral Galactic magnetic field is significantly reduced in our analysis.
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