Astrometry of the Star-Forming Region IRAS 05137+3919 in the Far Outer Galaxy
Astrometry of the Star-Forming Region IRAS 05137+3919 in the Far Outer Galaxy
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DOI：
10.1093/pasj/63.1.17
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发表时间：
2011-01
影响因子：
2.3
通讯作者：
M. Honma;T. Hirota;Y. Kan-ya;N. Kawaguchi;H. Kobayashi;T. Kurayama;Katsuhisa Sato
中科院分区：
文献类型：
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作者：
M. Honma;T. Hirota;Y. Kan-ya;N. Kawaguchi;H. Kobayashi;T. Kurayama;Katsuhisa Sato
本文介绍了用VERA对IRAS 05137+3919中的H2O脉泽源进行的天体测量观测结果。我们已经推导出视差\pi = 0.086 +/- 0.027 mas，这对应于D=11.6+5.3-2.8 kpc的源距离。虽然视差测量只有3-sigma水平，因此距离的不确定性相当大，但我们可以强烈地限制到这个源的最小距离，在90%的置信水平下，将源定位在距离太阳大于8.3 kpc（或距离银河系中心16.7 kpc）的位置。我们的研究结果提供了一个天体测量确认，这个源位于遥远的外星系超过15千秒差距的银河系中心，表明IRAS 05137+3919是最遥远的恒星形成区域之一，从银河系中心。
We present the results of astrometric observations with VERA toward the H2O maser sources in IRAS 05137+3919, which is thought to be located in the far outer Galaxy. We have derived the parallax of \pi = 0.086 +/- 0.027 mas, which corresponds to the source distance of D=11.6+5.3-2.8 kpc. Although the parallax measurement is only 3-sigma level and thus the distance uncertainty is considerably large, we can strongly constrain the minimum distance to this source, locating the source at the distance from the Sun greater than 8.3 kpc (or 16.7 kpc from the Galaxy's center) at 90% confidence level. Our results provide an astrometric confirmation that this source is located in the far outer Galaxy beyond 15 kpc from the Galaxy center, indicating that IRAS 05137+3919 is one of the most distant star-forming regions from the Galaxy center.