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Distance to Orion KL Measured with VERA

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arxiv 0705.3792 v1 pith:YQW3BNDT submitted 2007-05-25 astro-ph

Distance to Orion KL Measured with VERA

Tomoya Hirota , Takeshi Bushimata , Yoon Kyung Choi , Mareki Honma , Hiroshi Imai , Kenzaburo Iwadate , Takaaki Jike , Seiji Kameno
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Osamu Kameya Ryuichi Kamohara Yukitoshi Kan-ya Noriyuki Kawaguchi Masachika Kijima Mi Kyoung Kim Hideyuki Kobayashi Seisuke Kuji Tomoharu Kurayama Seiji Manabe Kenta Maruyama Makoto Matsui Naoko Matsumoto Takeshi Miyaji Takumi Nagayama Akiharu Nakagawa Kayoko Nakamura Chung Sik Oh Toshihiro Omodaka Tomoaki Oyama Satoshi Sakai Tetsuo Sasao Katsuhisa Sato Mayumi Sato Katsunori M. Shibata Motonobu Shintani Yoshiaki Tamura Miyuki Tsushima Kazuyoshi Yamashita
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keywords orionparallaxannualdistancemotionveravlbiastrometry
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We present the initial results of multi-epoch VLBI observations of the 22 GHz H2O masers in the Orion KL region with VERA (VLBI Exploration of Radio Astrometry). With the VERA dual-beam receiving system, we have carried out phase-referencing VLBI astrometry and successfully detected an annual parallax of Orion KL to be 2.29+/-0.10 mas, corresponding to the distance of 437+/-19 pc from the Sun. The distance to Orion KL is determined for the first time with the annual parallax method in these observations. Although this value is consistent with that of the previously reported, 480+/-80 pc, which is estimated from the statistical parallax method using proper motions and radial velocities of the H2O maser features, our new results provide the much more accurate value with an uncertainty of only 4%. In addition to the annual parallax, we have detected an absolute proper motion of the maser feature, suggesting an outflow motion powered by the radio source I along with the systematic motion of source I itself.

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