Statistical Analysis of Extra-galactic Rotation Measures

Details Statistical Analysis of Extra-galactic Rotation Measures Statistical Analysis of Extra-galactic Rotation Measures

2004-10-27

arxiv.org/abs/astro-ph/0410659v1

in "The Magnetized Interstellar Medium", Proceedings of the conference, held in Antalya, Turkey, September 8 - 12, 2003, Eds:

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures

Scientific paper

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 degrees on either side of the Galactic plane. Furthermore we observe an excess of RM on spatial scales between 30 degrees and 50 degrees 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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