用澳大利亚长基线天线阵对6.7 GHz甲醇脉泽的首次视差测量--距离G339 .884-1.259
First Parallax Measurements Towards a 6.7 GHz Methanol Maser with the Australian Long Baseline Array - Distance to G339.884-1.259
摘要：
我们利用澳大利亚长基线阵列（LBA）对6.7GHz甲醇脉泽辐射进行了首次视差和自行测量。G339.884 $-$ 1.259的视差是0.48 $\pm $ 0.08 mas，对应于$2.1^{+0.4}_{-0.3}$ kpc的距离，将其放置在盾牌旋臂中。这与使用最新的太阳和银河系旋转参数估计的2.5 $\pm $ 0.5 kpc的运动学距离是一致的（在组合不确定度内）。我们发现从莱曼连续光子通量的嵌入式核心的年轻恒星的光谱类型B1，表明发光6.7 GHz的甲醇脉泽可以与高质量的恒星对低端的质量范围。
英文摘要：
We have conducted the first parallax and proper motion measurements of 6.7 GHz methanol maser emission using the Australian Long Baseline Array (LBA). The parallax of G339.884$-$1.259 measured from five epochs of observations is 0.48$\pm $0.08 mas, corresponding to a distance of $2.1^{+0.4}_{-0.3}$ kpc, placing it in the Scutum spiral arm. This is consistent (within the combined uncertainty) with the kinematic distance estimate for this source at 2.5$\pm $0.5 kpc using the latest Solar and Galactic rotation parameters. We find from the Lyman continuum photon flux that the embedded core of the young star is of spectral type B1, demonstrating that luminous 6.7 GHz methanol masers can be associated with high-mass stars towards the lower end of the mass range.
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