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Hiroshi Imai, Kohichiro Nakashima, Takeshi Bushimata, Yoon Kyung Choi, Tomoya Hirota, Mareki Honma, Koji Horiai, Noritomo Inomata, Kenzaburo Iwadate, Takaaki Jike, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-ya, Noriyuki Kawaguchi, Masachika Kijima, Hideyuki Kobayashi, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Takeshi Miyaji, Takumi Nagayama, Akiharu Nakagawa, Chung Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Satoshi Sakai, Seiichiro Sakakibara, Katsuhisa Sato, Tetsuo Sasao, Katsunori M. Shibata, Rie Shimizu, Motonobu Shintani, Yoshiaki Sofue, Kasumi Sora, Hiroshi Suda, Yoshiaki Tamura, Miyuki Tsushima, Yuji Ueno, Kazuyoshi Yamashita, Astrometry of H|$_2$|O Masers in Nearby Star-Forming Regions with VERA I. IRAS 16293|$-$|2422 in |$\rho$| Oph East, Publications of the Astronomical Society of Japan, Volume 59, Issue 6, 25 December 2007, Pages 1107–1113, https://doi.org/10.1093/pasj/59.6.1107
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Abstract
We report on results of multi-epoch VLBI observations of H|$_2$|O masers associated with a low-mass young stellar object, IRAS 16293|$-$|2422 in |$\rho$| Oph East, and a fringe-phase and position reference source, ICRF J162546.8|$-$|252738, using the VLBI Exploration of Radio Astrometry (VERA) for high-precision astrometry. We obtained an annual parallax of a maser feature to be |$\pi=$| 5.6|$^{+1.5}_{-0.5}$| mas, corresponding to a distance of |$D=178^{+18}_{-37}$| pc. We also found 10 relative proper motions of maser features with respect to the maser feature mentioned above. The motion of the accompanying young stellar object (YSO) has already been found in thermal continuum emission previously observed with the Very Large Array. The intrinsic motions of masers have been estimated from the relative proper motions after the YSO’s motion is subtracted from, and a systemic secular motion of the position reference feature is added to the proper motions originally measured. The intrinsic maser kinematical structure may trace a bipolar outflow.
