Widespread Molecular Outflows in the Infrared Dark Cloud G28.37+0.07: Indications of Orthogonal Outflow-filament Alignment
Widespread Molecular Outflows in the Infrared Dark Cloud G28.37+0.07: Indications of Orthogonal Outflow-filament Alignment
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DOI：
10.3847/1538-4357/ab07b9
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发表时间：
2019-03
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影响因子：
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通讯作者：
Shuo Kong;H. Arce;M. Maureira;P. Caselli;J. Tan;F. Fontani
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文献类型：
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作者：
Shuo Kong;H. Arce;M. Maureira;P. Caselli;J. Tan;F. Fontani
本文介绍了对一个大质量红外暗云G28.37+0.07的阿尔马CO（2-1）观测。阿尔马的数据揭示了大量的分子（CO）流出的大小范围广泛的整个云。62个1.3 mm连续体核心被确定为驱动分子流出。我们测定了120个CO外流叶在天平面上的位置角，并研究了它们的分布。我们发现，天空平面流出位置角的分布在大约100°处达到峰值，对应于具有近似东西方向的流出的集中。对于大多数外流，我们已经能够估计出外流轴和暗条之间的天平面角，暗条是为外流提供动力的原恒星所在。统计检验有力地表明，流出丝方向的分布是一致的，大多数流出轴大多正交于他们的母丝在三维空间。这种排列可能是由于暗条碎裂或暗条向嵌入的原恒星核心连续的物质输送。后者建议最近的数值研究与中等强磁场。
We present ALMA CO(2-1) observations toward a massive infrared dark cloud G28.37+0.07. The ALMA data reveal numerous molecular (CO) outflows with a wide range of sizes throughout the cloud. Sixty-two 1.3 mm continuum cores were identified to be driving molecular outflows. We have determined the position angle in the plane-of-sky of 120 CO outflow lobes and studied their distribution. We find that the distribution of the plane-of-sky outflow position angles peaks at about 100°, corresponding to a concentration of outflows with an approximately east–west direction. For most outflows, we have been able to estimate the plane-of-sky angle between the outflow axis and the filament that harbors the protostar that powers the outflow. Statistical tests strongly indicate that the distribution of outflow-filament orientations is consistent with most outflow axes being mostly orthogonal to their parent filament in three dimensions. Such alignment may result from filament fragmentation or continuous mass transportation from the filament to the embedded protostellar core. The latter is suggested by recent numerical studies with moderately strong magnetic fields.