使用 VERA 测量 Orion KL 的距离
天体物理学
2015-05-13 v1
摘要
我们报告了利用 VERA（VLBI Exploration of Radio Astrometry）对 Orion KL 区域 22 GHz H2O 红外星团进行多时段 VLBI 观测的初步结果。运用 VERA 双束接收系统，我们开展了相位参考 VLBI 测距，成功检测到 Orion KL 年Parallax 为 2.29±0.10 mas，对应距离为 437±19 pc。这是该观测中首次使用年Parallax 方法确定 Orion KL 距离。虽然该值与先前基于 H2O 红外星团特征的径向速度和视差速率统计Parallax 方法测得的 480±80 pc 结果一致，但本次结果不确定性仅为 4%，精度显著提升。除年Parallax 外，我们还检测到红外星团特征的绝对视差，表明该区域 I 沿射线源的喷流运动以及 I 本身的系统运动。
引用
@article{arxiv.0705.3792,
title = {Distance to Orion KL Measured with VERA},
author = {Tomoya Hirota and Takeshi Bushimata and Yoon Kyung Choi and Mareki Honma and Hiroshi Imai and Kenzaburo Iwadate and Takaaki Jike and Seiji Kameno and Osamu Kameya and Ryuichi Kamohara and Yukitoshi Kan-ya and Noriyuki Kawaguchi and Masachika Kijima and Mi Kyoung Kim and Hideyuki Kobayashi and Seisuke Kuji and Tomoharu Kurayama and Seiji Manabe and Kenta Maruyama and Makoto Matsui and Naoko Matsumoto and Takeshi Miyaji and Takumi Nagayama and Akiharu Nakagawa and Kayoko Nakamura and Chung Sik Oh and Toshihiro Omodaka and Tomoaki Oyama and Satoshi Sakai and Tetsuo Sasao and Katsuhisa Sato and Mayumi Sato and Katsunori M. Shibata and Motonobu Shintani and Yoshiaki Tamura and Miyuki Tsushima and Kazuyoshi Yamashita},
journal= {arXiv preprint arXiv:0705.3792},
year = {2015}
}
备注
7 pages, 3 figures. PASJ, in press (Vol. 59, No. 5, October 25, 2007 issue)