INFALL AND ROTATION MOTIONS IN THE HH 111 PROTOSTELLAR SYSTEM: A FLATTENED ENVELOPE IN TRANSITION TO A DISK?
INFALL AND ROTATION MOTIONS IN THE HH 111 PROTOSTELLAR SYSTEM: A FLATTENED ENVELOPE IN TRANSITION TO A DISK?
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HH 111 原恒星系统中的坠落和旋转运动：向圆盘过渡的扁平包络？
DOI：
10.1088/0004-637x/694/2/1395
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
B. Reipurth
中科院分区：
文献类型：
--
作者：
Chin;Yao;B. Reipurth
我们绘制了HH 111原恒星系统的中心区域，在1.33 mm连续体中，用亚毫米阵列以~ 3″分辨率绘制了C18O (J = 2−1),13CO （J = 2−1）和SO （NJ = 56−45）发射。有两个源，VLA 1 （=IRAS 05491+0247）和VLA 2，其中VLA 1源驱动HH 111喷气机。在1.33毫米的连续体中可以看到热发射，它跟踪了包层中的尘埃和源周围的假定圆盘。在C18O和13CO中，在垂直于喷流轴的VLA 1源周围，可以看到一个扁平的环状包膜，其内半径为~ 400 AU（1″），外半径为~ 3200 AU（8″），厚度为~ 1000 AU（2.″5）。它似乎是以特定角动量守恒的方式向中心下落，而不是像Yang等人假设的那样以开普勒旋转的方式。在SO中可以看到一个内包膜，半径为~ 500 AU（1.″3）。这个内包络层的内部部分，在空间上与尘埃通道一致，似乎有一个微分旋转，因此可能形成了一个旋转支撑的圆盘。然而，这个内包络层的外部可能有一个向中心下降的旋转速度，因此代表了一个区域，在那里一个下降的包络层正在向一个旋转支撑的圆盘过渡。与坍缩模型的简单比较表明，在C18O和13CO中看到的扁平的环状包层可能是磁化旋转环面坍缩的结果。
We have mapped the central region of the HH 111 protostellar system in 1.33 mm continuum, C18O (J = 2 − 1), 13CO (J = 2 − 1), and SO (NJ = 56 − 45) emissions at ∼3″ resolution with the Submillimeter Array. There are two sources, VLA 1 (=IRAS 05491+0247) and VLA 2, with the VLA 1 source driving the HH 111 jet. Thermal emission is seen in 1.33 mm continuum tracing the dust in the envelope and the putative disks around the sources. A flattened, toruslike envelope is seen in C18O and 13CO around the VLA 1 source surrounding the dust lane perpendicular to the jet axis, with an inner radius of ∼400 AU (1″), an outer radius of ∼3200 AU (8″), and a thickness of ∼1000 AU (2.″5). It seems to be infalling toward the center with the conservation of specific angular momentum rather than with a Keplerian rotation as assumed by Yang et al. An inner envelope is seen in SO, with a radius of ∼500 AU (1.″3). The inner part of this inner envelope, which is spatially coincident with the dust lane, seems to have a differential rotation and thus may have formed a rotationally supported disk. The outer part of this inner envelope, however, may have a rotation velocity decreasing toward the center and thus represent a region where an infalling envelope is in transition to a rotationally supported disk. A brief comparison with a collapsing model suggests that the flattened, toruslike envelope seen in C18O and 13CO could result from a collapse of a magnetized rotating toroid.
影响因子：
6.5
作者：
K. Menten;M. Reid;J. Forbrich;J. Forbrich;A. Brunthaler
通讯作者：
K. Menten;M. Reid;J. Forbrich;J. Forbrich;A. Brunthaler