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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Trigonometric parallax measurement of a water maser source toward the SgrD HII region
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Trigonometric parallax measurement of a water maser source toward the SgrD HII region

机译：三角视视对SGRD HII地区的水域来源的测量

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摘要

We report on VLBI observations of a water maser source associated with the SgrD HII region, which is a bright radio continuum source in the direction of the Galactic center region. The absolute proper motions and the distance measured by VLBI Exploration of Radio Astrometry (VERA) were (mu(alpha) cos delta, mu(delta)) = (-1.32 +/- 0.15 mas yr(-1), -2.86 +/- 0.34 mas yr(-1)) and d = 2.36(-0.39)(+0.58) kpc, respectively. The line-of-sight velocity of the water maser emission is similar to that of the H91 alpha recombination line emission detected at the SgrD H II region. The spatial position and line-of-sight velocity of the water maser emission indicate that this source is physically associated with the extended HII source seen under radio continuum observations. Thus, our results suggest that the SgrD HII region is located in the Scutum arm of the Galactic disk. We discuss this new view of the SgrD complex, based on the parallax and proper motions.
机译：我们报告了与SgrD HII区域相关的水脉泽源的VLBI观测，该区域是银河系中心区域方向的明亮射电连续源。VLBI射电天体测量探测（VERA）测量的绝对自行和距离分别为（μ（α）cosδ，μ（δ））=（-1.32+/-0.15 mas-yr（-1），-2.86+/-0.34 mas-yr（-1））和d=2.36（-0.39）（+0.58）kpc。水脉泽发射的视线速度与在SgrD H II区域检测到的H91α复合线发射的视线速度相似。水脉泽发射的空间位置和视线速度表明，该源与射电连续体观测下的扩展HII源有物理联系。因此，我们的结果表明SgrD HII区域位于星系盘的盾臂。我们讨论了基于视差和固有运动的SgrD复合体的新视图。

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