Optical and near-infrared polarimetric study of the RCW121 galactic H II region
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Resumo
We present a polarimetric study of the RCW121 star-forming region to derive the orientation of the sky-projected magnetic field component traced by the polarization vectors, the morphology of which tends to follow the cloud's structure. Individual polarization-angle values are consistent across the different bands, having a broad distribution towards the RCW121 H II region. We estimate the corresponding magnetic field orientation in the H II region to have a mean value of −12° ± 7°. RCW121 shows an elongated shape in the same direction as the magnetic field orientation, which may be evidence that magnetic pressure opposes the H II region expansion. Serkowski's relation was used to determine individual values of the total-to-selective extinction ratio (RV) distribution and a weighted mean value of RV = 3.17 ± 0.05. We derive a foreground component of the polarization degree that is consistent with the literature value for this Galactic region.
Abstract
Assunto
Polarimetria, Astrofísica, Meio interestelar, Polarização (Luz)
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Stars, Optics, Near-infrared polarimetric study
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https://academic.oup.com/mnras/article/462/2/2266/2589405