Astrometry of Galactic Star-Forming Region G48.61+0.02 with VERA

作者：Nagayama Takumi^*; Omodaka Toshihiro; Handa Toshihiro; Honma Mareki; Kobayashi Hideyuki; Kawaguchi Noriyuki; Ueno Yuji

来源：Publications of the Astronomical Society of Japan, 2011, 63(4): 719-725.

• Galaxy: kinematics and dynamics
• stars: individual (G48.61+0.02)

We performed the astrometry of H(2)O masers in the Galactic star-forming region G48.61+0.02 with the VLBI Exploration of Radio Astrometry (VERA). We derived a trigonometric parallax of 199 +/- 7 mu as, which corresponds to a distance of 5.03 +/- 0.19 kpc. The distance to G48.61+0.02 is about half of its far kinematic distance, which was often assumed previously. This distance places G48.61+0.02 in the Sagittarius-Carina arm, and near to the active star-forming region and the supernova remnant W 51. We also obtained the three-dimensional motion of G48.61+0.02, and found that it has a large peculiar motion of 40 +/- 5 kms(-1). This peculiar motion would have originated along with multiple supernovae explosions in W 51, or streaming motion across the Sagittarius-Carina arm.

• 出版日期2011
• 单位中国科学院国家天文台