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Paper: Astrometry of H2O Maser Sources in Nearby Molecular Clouds with VERA
Volume: 402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies
Page: 456
Authors: Hirota, T.; Bushimata, T.; Choi, Y.K.; Honma, M.; Imai, H.; Iwadate, K.; Jike, T.; Kameno, S.; Kameya, O.; Kamohara, R.; Kan-ya, Y.; Kawaguchi, N.; Kijima, M.; Kim, M.K.; Kobayashi, H.; Kuji, S.; Kurayama, T.; Manabe, S.; Maruyama, K.; Matsui, M.; Matsumoto, N.; Miyaji, T.; Nagayama, T.; Nakagawa, A.; Nakamura, K.; Oh, C.S.; Omodaka, T.; Oyama, T.; Sakai, S.; Sasao, T.; Sato, K.; Sato, M.; Shibata, K.M.; Shintani, M.; Tamura, Y.; Tsushima, M.; Yamashita, K.
Abstract: We report on the recent results of astrometic observations of H2O maser sources associated with the nearby molecular clouds with VERA. We carried out phase-referencing VLBI astrometry of H2O masers in a high-mass star-forming region Orion KL 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. In addition, we obtained an annual parallax of a nearby low-mass star-forming region NGC 1333 to be 4.25±0.32 mas, corresponding to the distance of 235±18 pc from the Sun. Our results demonstrate the high capability of astrometry with VERA, which can provide the most accurate distances to nearby molecular clouds.
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