Water Maser Motions in W3(OH) and a Determination of Its Distance
Water Maser Motions in W3(OH) and a Determination of Its Distance
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DOI：
10.1086/502962
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
K. Hachisuka;K. Hachisuka;A. Brunthaler;A. Brunthaler;K. Menten;Mark J. Reid;H. Imai;Yoshiaki Hagiwara
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文献类型：
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作者：
K. Hachisuka;K. Hachisuka;A. Brunthaler;A. Brunthaler;K. Menten;Mark J. Reid;H. Imai;Yoshiaki Hagiwara
本文报道了在恒星形成区W3（OH）附近的H2O脉泽的相位参考VLBA观测，以测量它们的视差和绝对自行。测得的年视差为0.489 ± 0.017 mas（2.04 ± 0.07 kpc），其中误差主要是由系统大气贡献。这一距离与以前观测的测光距离以及在相关论文中提出的CH 3OH脉泽天体测量所确定的距离一致。我们还发现，驱动H2O外流的源，“TW-对象”，以>7 km s-1的三维速度相对于超紧H II区域W3（OH）移动。
We report phase-referencing VLBA observations of H2O masers near the star-forming region W3(OH) to measure their parallax and absolute proper motions. The measured annual parallax is 0.489 ± 0.017 mas (2.04 ± 0.07 kpc), where the error is dominated by a systematic atmospheric contribution. This distance is consistent with photometric distances from previous observations and with the distance determined from CH3OH maser astrometry presented in a related paper. We also find that the source driving the H2O outflow, the "TW-object," moves with a three-dimensional velocity of >7 km s-1 relative to the ultracompact H II region W3(OH).