Molecular Outflows around High-Mass Young Stellar Objects
Molecular Outflows around High-Mass Young Stellar Objects
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DOI：
10.1086/504466
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发表时间：
2006-04
期刊：
影响因子：
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通讯作者：
Y. Xu;Z. Shen;J. Yang;X. Zheng;A. Miyazaki;K. Sunada;H. J. Ma;J. Li;J. Sun;C. Pei
中科院分区：
文献类型：
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作者：
Y. Xu;Z. Shen;J. Yang;X. Zheng;A. Miyazaki;K. Sunada;H. J. Ma;J. Li;J. Sun;C. Pei
我们利用 CO (1-0) 线发射的高分辨率映射对八个相对较近的 6.7 GHz 甲醇微波激射器进行分子外流研究，这些微波激射器与大质量恒星形成区域相关。在八个源中的七个中检测到流出，其中五个清楚地显示出双极或多级流出形态。这些流出物的典型质量为几个太阳质量，动量为数十 M⊙ km s-1，动能为 ∼1045 ergs，质量夹带率为几个 10-5 M⊙ yr-1。它们的质量和动能比低质量的同类要大得多。在一些来源中，大量外流显然与星团中的特定大质量恒星有关，而在其他来源中，其起源仍然不确定。甲醇脉泽流出物的高检测率表明，大质量原恒星的流出相包含甲醇脉泽相。
We present a study of molecular outflows using high-resolution mapping of the CO (1-0) line emission toward eight relatively nearby 6.7 GHz methanol masers that are associated with massive star-forming regions. Outflows were detected in seven out of eight sources, and five of them clearly show bipolar or multiple outflow morphologies. These outflows have typical masses of a few solar masses, momenta of tens of M⊙ km s-1, kinetic energies of ∼1045 ergs, and mass entrainment rates of a few 10-5 M⊙ yr-1. They have significantly more mass and kinetic energy than their low-mass counterparts. In some of the sources, the massive outflow is obviously associated with a particular massive star in the cluster, while in others the origin remains uncertain. The high detection rate of outflows toward methanol masers suggests that the outflow phase of massive protostars encompasses the methanol maser phase.