S106与SIRPOL成键区的近红外成像偏振研究
Near-Infrared Imaging Polarimetry of S106 Cluster-Forming Region with SIRPOL
摘要：
本文介绍了利用红外巡天望远镜对HII区S106进行的宽视场JHKs偏振测量的结果。我们的偏振测量数据揭示了S106上方的一个扩展的（高达~ 5 '）偏振星云。通过对偏振矢量的分析，我们确认了星云大部分照明源的位置与S106 IRS 4一致。偏振强度的明亮部分与分子气体的红翼成分一致。扩散偏振强度发射沿南北分子气道分布。找到了S106 IRS 4辐射与稠密气体的相互作用区。此外，我们还发现了两个小的偏振星云，SIRN 1和SIRN 2，与一个年轻的恒星物体（YSO）有关。首次在该区域进行了点源孔径偏振测量。利用类点源孔径偏振测量法计算了S106星系团周围的区域磁场结构，发现其磁场结构位置角约为120 $\arcdeg$。然而，在星团区域中的磁场具有三种类型的位置角：~ 20 $\arcdeg$、~ 80 $\arcdeg$和~ 120 $\arcdeg$。本磁场结构与亚毫米波连续观测结果一致。我们发现稠密气体区和低密度气体区的磁场方向并不一致。
英文摘要：
We present the results of wide-field JHKs polarimetry toward the HII region S106 using the IRSF (Infrared Survey Facility) telescope. Our polarimetry data revealed an extended (up to ~ 5') polarized nebula over S106. We confirmed the position of the illuminating source of most of the nebula as consistent with S106 IRS4 through an analysis of polarization vectors. The bright portion of the polarized intensity is consistent with the red wing component of the molecular gas. Diffuse polarized intensity emission is distributed along the north--south molecular gas lanes. We found the interaction region between the radiation from S106 IRS4 and the dense gas. In addition, we also discovered two small polarization nebulae, SIRN1 and SIRN2, associated with a young stellar objects (YSO). Aperture polarimetry of point-like sources in this region was carried out for the first time. The regional magnetic field structures were derived using point-like source aperture polarimetry, and the magnetic field structure position angle around the cluster region in S106 was found to be ~ 120$\arcdeg$. The magnetic fields in the cluster region, however, have three type position angles: ~ 20$\arcdeg$, ~ 80$\arcdeg$, and ~ 120$\arcdeg$. The present magnetic field structures are consistent with results obtained by submillimeter continuum observations. We found that the magnetic field direction in the dense gas region is not consistent with that of the low density gas region.
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