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New Silhouette Disks with Reflection Nebulae and Outflows in the Orion Nebula and M43*

机译:在Orion星云和M43中具有反射星云和流出的新轮廓盘

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We report the detection of several new circumstellar disks seen in silhouette against background nebular light in the outskirts of the Orion Nebula and the neighboring H II region M43. These were detected as part of our Hα survey of Orion with the Advanced Camera for Surveys on board the Hubble Space Telescope. Several of the disks show bipolar reflection nebulae, microjets, or pronounced temporal variability of their central stars. The relatively large fraction of bipolar reflection nebulae and microjets in our sample may be a selection effect caused by the faint nebular background far from the Trapezium. Two disks in our sample are large and particularly noteworthy: A nearly edge-on disk, d216-0939, is located several arcminutes northwest of M43 and resembles the famous HH 30 disk/jet system in Taurus. It drives the 0.15 pc long bipolar outflow HH 667 and exhibits a remarkable asymmetric reflection nebula caused by the tilt of the flared disk. With a diameter of ~26 (1200 AU), d216-0939 is as large as the giant edge-on silhouette disk d114-426 in the core of the Orion Nebula. The large disk d253-1536 is located in a binary system embedded within an externally ionized giant proplyd in M43. The disk exhibits distortions that we attribute to tidal interactions with the companion star. The bipolar jet HH 668 emerges from the proplyd ionization front in a direction orthogonal to the disk and can be traced to the young star embedded within it. A bow shock lies 54'' south of this binary system along the outflow axis. Proper motions over a 1.4 yr baseline confirm that these emission knots are indeed moving away from d253-1536 with speeds as high as ~330 km s-1 in the HH 668 microjet and slower motion farther from the star.
机译:我们报告了在猎户座星云和邻近的H II区域M43郊区发现的几个新的绕星盘的轮廓背景星云光的剪影。这些是通过哈勃太空望远镜上的“高级勘测相机”在猎户座Hα勘测中检测到的。几个盘显示双极反射星云,微射流或其中心星的明显时变性。我们样品中相对较大比例的双极反射星云和微射流可能是由于远离梯形的微弱星云背景引起的选择效应。我们的样本中有两个磁盘很大,尤其值得一提:一个接近边缘的磁盘d216-0939位于M43西北数弧分钟处,类似于金牛座著名的HH 30磁盘/喷射系统。它驱动0.15 pc长的双极流出HH 667,并表现出由张开的圆盘倾斜引起的非对称反射星云。 d216-0939的直径约为〜26(1200 AU),与猎户座星云核心中的巨型边缘轮廓盘d114-426一样大。大磁盘d253-1536位于二进制系统中,该二进制系统嵌入M43的外部电离巨人内部。圆盘表现出畸变,我们将其归因于与伴星的潮汐相互作用。双极射流HH 668在垂直于磁盘的方向上从预离子化前沿出现,并且可以追踪到嵌入其中的年轻恒星。弓形冲击沿流出轴位于该二元系统以南54英寸处。在1.4年基线上的正确运动证实了这些发射结确实已从d253-1536移开,HH 668微型喷气机的速度高达〜330 km s-1,而离恒星更慢的运动更慢。

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