MAGNETIC FIELD OF THE VELA C MOLECULAR CLOUD
MAGNETIC FIELD OF THE VELA C MOLECULAR CLOUD
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DOI：
10.3847/2041-8205/830/2/l23
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
Takayoshi Kusune;K. Sugitani;F. Nakamura;Makoto Watanabe;M. Tamura;J. Kwon;S. Sato
中科院分区：
文献类型：
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作者：
Takayoshi Kusune;K. Sugitani;F. Nakamura;Makoto Watanabe;M. Tamura;J. Kwon;S. Sato
我们对船帆座C分子云进行了广泛的近红外（JHKs）成像偏振测量，该分子云覆盖了五个具有不同形态特征的高密度子区域（北，中脊，中巢，南脊和南巢）。得到的极化矢量图显示，这些子区域中的三个具有不同的平面的天空（POS）磁场特征，根据形态特征。(1)在中心脊子区域（主导脊）中，POS磁场大部分垂直于脊。(2)在中心巢子区域中，具有略微延伸的细丝巢的结构，POS磁场几乎平行于其整体伸长。(3)在南巢子区域，它有一个小的细丝网络，POS磁场似乎是混乱的。通过应用P-Fermi方法，我们推导出了中心脊、中心巢和南脊子区域的POS磁场强度为1070 -310 μG。在南巢子区域，偏振角的色散太大而不能应用C-F方法。由于这一子区的速度色散并不大于其它子区的速度色散，我们认为这一子区的磁场比其它子区的磁场弱。我们还讨论了POS磁场（位形和强度）与各子区域云结构之间的关系。
We have performed extensive near-infrared (JHKs) imaging polarimetry toward the Vela C molecular cloud, which covers the five high-density sub-regions (North, Centre-Ridge, Centre-Nest, South-Ridge, and South-Nest) with distinct morphological characteristics. The obtained polarization vector map shows that three of these sub-regions have distinct plane-of-the-sky (POS) magnetic-field characteristics according to the morphological characteristics. (1) In the Centre-Ridge sub-region, a dominating ridge, the POS magnetic field is mostly perpendicular to the ridge. (2) In the Centre-Nest sub-region, a structure having a slightly extended nest of filaments, the POS magnetic field is nearly parallel to its global elongation. (3) In the South-Nest sub-region, which has a network of small filaments, the POS magnetic field appears to be chaotic. By applying the Chandrasekhar–Fermi method, we derived the POS magnetic field strength as ∼70–310 μG in the Centre-Ridge, Centre-Nest, and South-Ridge sub-regions. In the South-Nest sub-region, the dispersion of polarization angles is too large to apply the C-F method. Because the velocity dispersion in this sub-region is not greater than those in the other sub-regions, we suggest that the magnetic field in this sub-region is weaker than those in other sub-regions. We also discuss the relationship between the POS magnetic field (configuration and strength) and the cloud structure of each sub-region.