Large Proper Motions in the Jet of the High-Mass YSO Cepheus A HW2
Large Proper Motions in the Jet of the High-Mass YSO Cepheus A HW2
复制标题
大质量 YSO 仙王座 A HW2 喷流中的大自行运动
DOI：
10.1086/498931
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
G. Anglada
中科院分区：
文献类型：
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作者：
S. Curiel;P. Ho;N. Patel;J. Torrelles;Luis F. Rodriguez;M. A. Trinidad;J. Canto;Laura Hernandez;J. Gómez;G. Garay;G. Anglada
利用1991-2004年期间在3.6 cm、1.3 cm和7 mm波段的高角分辨率（~0.″25-0.″05）甚大阵（VLA）观测，我们在仙王座A星形成区观测到了与高质量年轻天体（YSO）HW 2有关的射电连续喷流分量的大自行。外流的两个主要组成部分，在几乎相反的方向远离中心源，观察到的相对自行的数量级为140 mas yr-1，或~480 km s-1，在725 pc的距离。在东北叶和西南叶观察到的自行并不是完全反平行的，中央拉长的源似乎正在改变方向。我们讨论可能的情况下，这些和其他观察到的特征。我们还报告了一个7毫米的紧凑的连续冷凝的热射电连续喷流，我们建议的位置，令人兴奋的星星的中心附近的发射检测。
Using high angular resolution (~0.″25-0.″05) Very Large Array (VLA) observations made at 3.6 cm, 1.3 cm, and 7 mm during the period 1991-2004, we report the detection of large proper motions in the components of the radio continuum jet associated with the high-mass young stellar object (YSO) HW2 in the star-forming region Cepheus A. The relative proper motions observed for the two main components of the outflow, moving away from the central source in nearly opposite directions, are of the order of 140 mas yr-1, or ~480 km s-1 at a distance of 725 pc. The proper motions observed in the northeast and southwest lobes are not completely antiparallel, and the central elongated source seems to be changing orientation. We discuss possible scenarios to account for these and other observed characteristics. We also report the detection of a 7 mm compact continuum condensation of emission near the center of the thermal radio continuum jet, which we propose as the location of the exciting star.