NEAR-INFRARED CIRCULAR POLARIZATION IMAGES OF NGC 6334-V
NEAR-INFRARED CIRCULAR POLARIZATION IMAGES OF NGC 6334-V
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DOI：
10.1088/2041-8205/765/1/l6
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发表时间：
2013-03-01
影响因子：
7.9
通讯作者：
Hough, James H.
中科院分区：
文献类型：
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作者：
Kwon, Jungmi;Tamura, Motohide;Hough, James H.
我们展示了对大质量恒星形成区域NGC 6334-V进行深度成像线性和圆偏振测量的结果。这些观测结果显示，与外流相关的红外星云中存在高度的圆偏振（CP），在K-s波段高达22%。CP具有不对称的正/负模式，并且非常延伸（类似于80 "或0.65 pc）。高CP和它的扩展尺寸都比猎户座CP区域中看到的要大。三维蒙特卡罗光散射模型被用来表明，高CP可能产生的散射从红外星云，然后由二向色消光的光学厚前景云包含对齐的尘埃颗粒。我们的结果不仅显示了年轻天体周围的磁场方向，而且还显示了星周物质的结构，如流出区和它们的母体分子云沿着视线。在这个源和猎户座星云中发现的大而扩展的CP可能暗示了地球上生物同手性的CP起源。
We present results from deep imaging linear and circular polarimetry of the massive star-forming region NGC 6334-V. These observations show high degrees of circular polarization (CP), as much as 22% in the K-s band, in the infrared nebula associated with the outflow. The CP has an asymmetric positive/negative pattern and is very extended (similar to 80 '' or 0.65 pc). Both the high CP and its extended size are larger than those seen in the Orion CP region. Three-dimensional Monte Carlo light-scattering models are used to show that the high CP may be produced by scattering from the infrared nebula followed by dichroic extinction by an optically thick foreground cloud containing aligned dust grains. Our results show not only the magnetic field orientation of around young stellar objects, but also the structure of circumstellar matter such as outflow regions and their parent molecular cloud along the line of sight. The detection of the large and extended CP in this source and the Orion nebula may imply the CP origin of the biological homochirality on Earth.