Enhanced small-scale Faraday rotation in the Galactic spiral arms

Details Enhanced small-scale Faraday rotation in the Galactic spiral arms Enhanced small-scale Faraday rotation in the Galactic spiral arms

2005-12-17

arxiv.org/abs/astro-ph/0512456v1

Astrophys.J.637:L33-L36,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. ApJ Letters, in press

Scientific paper

10.1086/500543

We present an analysis of the rotation measures (RMs) of polarized extragalactic point sources in the Southern Galactic Plane Survey. This work demonstrates that the statistics of fluctuations in RM differ for the spiral arms and the interarm regions. Structure functions of RM are flat in the spiral arms, while they increase in the interarms. This indicates that there are no correlated RM fluctuations in the magneto-ionized interstellar medium in the spiral arms on scales larger than ~ 0.5 deg, corresponding to ~ 17 pc in the nearest spiral arm probed. The non-zero slopes in interarm regions imply a much larger scale of RM fluctuations. We conclude that fluctuations in the magneto-ionic medium in the Milky Way spiral arms are not dominated by the mainly supernova-driven turbulent cascade in the global ISM but are probably due to a different source, most likely H II regions.

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