Water masers in W49N - The youngest stellar jet?
Water masers in W49N - The youngest stellar jet?
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W49N 中的水脉泽——最年轻的恒星喷流？
DOI：
10.1086/186444
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
M. Elitzur
中科院分区：
文献类型：
--
作者：
M. M. Low;M. Elitzur
Gwinn等（1992）对W49 N中水脉泽自行的观测表明，它们有一个从一个共同中心向外扩展的拉长的分布。具有高空间速度的特征仅出现在远离中心的地方，而低速特征出现在所有距离处。有人提出，在恒星形成区的水脉泽发生在膨胀的早期阶段，从年轻的大质量恒星的高速风席卷的膨胀壳。在W49N中，密度分布对气泡的约束可以解释速度场和脉泽分布的形状。膨胀气泡的完全动力学计算提供了一个令人满意的适合的观测，并建议该系统是只有约250岁。因此，这些观测可能显示了年轻恒星形成喷流的最初阶段。
Observations by Gwinn et al. (1992) of the proper motions of water masers in W49N show that they have an elongated distribution expanding from a common center. Features with high space velocity only occur far from the center, while low-velocity features occur at all distances. It is proposed that water masers in star-forming regions occur in expanding shells swept up by high-velocity winds from young, massive stars during the early phases of the expansion. In W49N, confinement of the bubble by a density distribution with an axial cavity can explain both the velocity field and the shape of the maser distribution. A fully dynamical calculation of the expanding bubble is presented which provides a satisfactory fit for the observations and suggests that this system is only about 250 yr old. Thus these observations may show the very first stages of the formation of a jet from a young stellar object.