Journal Article

The magnetic field of the H <span class="smallCaps">ii</span> region NGC 6334A from Faraday rotation

L. F. Rodríguez, Y. Gómez and D. Tafoya

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 1, pages 279-282
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI:
The magnetic field of the H ii region NGC 6334A from Faraday rotation

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We have studied the polarization characteristics and Faraday rotation of the extragalactic radio source J17204−3554, which appears projected on the north lobe of the Galactic H ii region NGC 6334A. From observations made with the Very Large Array at 6.0 and 3.6 cm in three different epochs (1994, 1997 and 2006), we estimate a rotation measure of +5100 ± 900 rad m−2 for the extragalactic source. This large rotation measure implies a line-of-sight average magnetic field of B≃+ 36 ± 6 μG, the largest obtained by this method for an H ii region. NGC 6334A is significantly denser than other H ii regions studied and this larger magnetic field is expected on the grounds of magnetic flux conservation. The ratio of thermal to magnetic pressure is ∼5 in the range of values determined for more diffuse H ii regions.

Keywords: polarization; H ii regions; ISM: individual objects: NGC 6334A; quasars: individual: J17204−3554

Journal Article.  2450 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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