NEAR-INFRARED CIRCULAR AND LINEAR POLARIMETRY OF MONOCEROS R2
NEAR-INFRARED CIRCULAR AND LINEAR POLARIMETRY OF MONOCEROS R2
复制标题
DOI：
10.3847/0004-6256/152/3/67
复制
发表时间：
2016-09-01
影响因子：
5.3
通讯作者：
Kusakabe, Nobuhiko
中科院分区：
文献类型：
--
作者：
Kwon, Jungmi;Tamura, Motohide;Kusakabe, Nobuhiko
我们对Monoceros R2 （monr2）星团进行了同步的jhk波段圆偏振成像和线性偏振成像。我们提出了从深和宽近红外线性偏振Mon R2区域的结果。我们重新观测了Mon R2星团上突出的和扩展的偏振星云，发现了一个与Mon R2星团相关的红外反射星云和两个本地反射星云vdB 67和vdB 69。我们还介绍了在同一区域的深成像圆偏振仪的结果。第一次观测到在Mon R2中有较高的圆偏振度（CP），在K-s波段高达约10%。在Mon R2星团周围的环状星云的最大CP范围约为0.60 pc，而在vdB 67周围的西部星云的最大CP范围约为0.24 pc。在IRc2附近的猎户座区域，CP的扩展大小比猎户座区域的大，而CP的最大程度为10%，比猎户座区域的最大程度为17%要小。尽管如此，这个区域的CP大小和程度在我们对恒星形成区域的红外CP调查中都是最大的。我们还研究了几种红外光源偏振度的时间变异性，并发现了三种红外光源的可能变化。
We have conducted simultaneous JHKs-band imaging circular and linear polarimetry of the Monoceros R2 (Mon R2) cluster. We present results from deep and wide near-infrared linear polarimetry of the Mon R2 region. Prominent and extended polarized nebulosities over the Mon R2 field are revisited, and an infrared reflection nebula associated with the Mon R2 cluster and two local reflection nebulae, vdB 67 and vdB 69, is detected. We also present results from deep imaging circular polarimetry in the same region. For the first time, the observations show relatively high degrees of circular polarization (CP) in Mon R2, with as much as approximately 10% in the K-s band. The maximum CP extent of a ring-like nebula around the Mon R2 cluster is approximately 0.60 pc, while that of a western nebula, around vdB 67, is approximately 0.24 pc. The extended size of the CP is larger than those seen in the Orion region around IRc2, while the maximum degree of CP of similar to 10% is smaller than those of similar to 17% seen in the Orion region. Nonetheless, both the CP size and degree of this region are among the largest in our infrared CP survey of star-forming regions. We have also investigated the time variability of the degree of the polarization of several infrared sources and found possible variations in three sources.