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Magnetic field structure of the Large Magellanic Cloud from Faraday rotation measures of Diffuse Polarized Emission

Citation

Mao, SA and McClure-Griffiths, NM and Gaensler, BM and Haverkorn, M and Beck, R and McConnell, D and Wolleben, M and Stanimirovic, S and Dickey, JM and Staveley-Smith, L, Magnetic field structure of the Large Magellanic Cloud from Faraday rotation measures of Diffuse Polarized Emission, Astrophysical Journal, 759, (1) Article 25. ISSN 0004-637X (2012) [Refereed Article]

Copyright Statement

Copyright 2012 The American Astronomical Society

DOI: doi:10.1088/0004-637X/759/1/25

Abstract

We present a study of the magnetic field of the Large Magellanic Cloud (LMC), carried out using diffuse polarized synchrotron emission data at 1.4 GHz acquired at the Parkes Radio Telescope and the Australia Telescope Compact Array. The observed diffuse polarized emission is likely to originate above the LMC disk on the near side of the galaxy. Consistent negative rotation measures (RMs) derived from the diffuse emission indicate that the line-of-sight magnetic field in the LMC's near-side halo is directed coherently away from us. In combination with RMs of extragalactic sources that lie behind the galaxy, we show that the LMC's large-scale magnetic field is likely to be of quadrupolar geometry, consistent with the prediction of dynamo theory. On smaller scales, we identify two brightly polarized filaments southeast of the LMC, associated with neutral hydrogen arms. The filaments' magnetic field potentially aligns with the direction toward the Small Magellanic Cloud (SMC). We suggest that tidal interactions between the SMC and the LMC in the past 109 years are likely to have shaped the magnetic field in these filaments.

Item Details

Item Type:Refereed Article
Keywords:Magellanic Clouds; magnetic fields; polarization
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Dickey, JM (Professor John Dickey)
ID Code:83113
Year Published:2012
Web of Science® Times Cited:24
Deposited By:Mathematics and Physics
Deposited On:2013-03-01
Last Modified:2015-02-10
Downloads:0

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