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29 March 2024
 
  » arxiv » 1110.4679

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The Magnetic Field of the H~II Region NGC 6334A
L. F. Rodriguez ; Y. Gomez ; D. Tafoya ;
Date 21 Oct 2011
AbstractWe have studied the polarization characteristics and Faraday rotation of the extragalactic radio source J17204$-$3554, that appears projected on the north lobe of the galactic H II region NGC 6334A. From observations made with the Very Large Array at 6.0 and 3.6 cm in three different epochs (1994, 1997, and 2006), we estimate a rotation measure of +5100$pm$900 rad m$^{-2}$ for the extragalactic source. This large rotation measure implies a line-of-sight average magnetic field of $B_parallel simeq +36pm6$ $mu$G, 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 $sim$5, in the range of values determined for more diffuse H II regions.
Source arXiv, 1110.4679
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