First Near-infrared Imaging Polarimetry of Young Stellar Objects in the Circinus Molecular Cloud
First Near-infrared Imaging Polarimetry of Young Stellar Objects in the Circinus Molecular Cloud
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DOI：
10.3847/1538-4365/aaa0cc
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
J. Kwon;T. Nakagawa;M. Tamura;J. Hough;Minho Choi;R. Kandori;T. Nagata;Miju Kang
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文献类型：
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作者：
J. Kwon;T. Nakagawa;M. Tamura;J. Hough;Minho Choi;R. Kandori;T. Nagata;Miju Kang
我们给出了近红外(NIR)线性成像偏振测量的结果，在J，H和Ks波段的低质量星团形成区在环行分子云复合体。利用类点源的孔径偏振法，在749个测得光度等的光源中，确定了J、H和Ks波段的314个、421个和164个光源的正探测。对于所有3个波段都可以测量偏振的133个点状光源的源分类，使用了颜色-颜色图。虽然类点源的大部分近红外偏振是排列良好的，可以用云中排列的星际尘埃颗粒产生的二色性偏振来解释，但也有123个高度极化的源被用一些标准来识别。CIR-MMS区磁场在天空中的投射方向由观察区点源的平均极化位置角(70°)表示，大约相当于Pc2。此外，还将磁场方向与与红外天文卫星源有关的流出方向进行了比较，在这些流出方向中，发现两个源彼此对齐，一个源不对齐。我们还首次在CIR-MMS区域显示了显著的偏振星云。我们的偏振数据显示了一个清晰的红外反射星云(IRn)和几个CIR-MMS场中的候选IRNe。此外，IRNe的照明源由近红外源和中红外源确定。
We present the results of near-infrared (NIR) linear imaging polarimetry in the J, H, and Ks bands of the low-mass star cluster-forming region in the Circinus Molecular Cloud Complex. Using aperture polarimetry of point-like sources, positive detection of 314, 421, and 164 sources in the J, H, and Ks bands, respectively, was determined from among 749 sources whose photometric magnitudes were measured. For the source classification of the 133 point-like sources whose polarization could be measured in all 3 bands, a color–color diagram was used. While most of the NIR polarizations of point-like sources are well-aligned and can be explained by dichroic polarization produced by aligned interstellar dust grains in the cloud, 123 highly polarized sources have also been identified with some criteria. The projected direction on the sky of the magnetic field in the Cir-MMS region is indicated by the mean polarization position angles (70°) of the point-like sources in the observed region, corresponding to approximately pc2. In addition, the magnetic field direction is compared with the outflow orientations associated with Infrared Astronomy Satellite sources, in which two sources were found to be aligned with each other and one source was not. We also show prominent polarization nebulosities over the Cir-MMS region for the first time. Our polarization data have revealed one clear infrared reflection nebula (IRN) and several candidate IRNe in the Cir-MMS field. In addition, the illuminating sources of the IRNe are identified with near- and mid-infrared sources.