Astrometry of the Star-Forming Region IRAS 05137+3919 in the Far Outer Galaxy

作者：Honma Mareki^*; Hirota Tomoya; Kan Ya Yukitoshi; Kawaguchi Noriyuki; Kobayashi Hideyuki; Kurayama Tomoharu; Sato Katsuhisa

来源：Publications of the Astronomical Society of Japan, 2011, 63(1): 17-22.

• astrometry
• ISM: individual (IRAS 05137+3919)
• techniques: interferometric
• VERA

We present the results of astrometric observations with VERA toward H2O maser sources in IRAS 05137+3919, which is thought to be located in the far outer Galaxy. We derived a parallax of pi = 0.086 +/- 0.027 mas, which corresponds to a source distance of D = 11.6(-2.8)(+5.3)kpc. Although the parallax measurement was only at the 3-sigma level, and thus the distance uncertainty was considerably large, we can strongly constrain the minimum distance to this source, locating the source at a distance from the Sun greater than 8.3 kpc (or 16.7 kpc from the Galaxy's center) at the 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.

• 出版日期2011
• 单位中国科学院国家天文台