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Enhanced Small-Scale Faraday Rotation in the Galactic Spiral Arms
Citation
Haverkorn, M and Gaensler, BM and Brown, JC and Bizunok, NS and McClure-Griffiths, NM and Dickey, JM and Green, AJ, Enhanced Small-Scale Faraday Rotation in the Galactic Spiral Arms, The Astrophysical Journal, 637, (1) pp. L33-L35. ISSN 0004-637X (2006) [Refereed Article]
DOI: doi:10.1086/500543
Abstract
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 magnetoionized interstellar medium in the spiral arms on scales larger than ∼0°.5, corresponding to ∼17 pc in the nearest spiral arm probed. The nonzero slopes in interarm regions imply a much larger scale of RM fluctuations. We conclude that fluctuations in the magnetoionic 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. © 2006. The American Astronomical Society. All rights reserved.
Item Details
Item Type: | Refereed Article |
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Research Division: | Physical Sciences |
Research Group: | Astronomical sciences |
Research Field: | Galactic astronomy |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the physical sciences |
UTAS Author: | Dickey, JM (Professor John Dickey) |
ID Code: | 39315 |
Year Published: | 2006 |
Web of Science® Times Cited: | 69 |
Deposited By: | Physics |
Deposited On: | 2006-08-01 |
Last Modified: | 2007-03-21 |
Downloads: | 0 |
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