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- W2029284492 abstract "Abstract We have carried out multi-epoch VLBI observations of the H 2 O maser sources associated with young stellar objects (YSOs) in nearby molecular clouds with VERA (VLBI Exploration of Radio Astrometry), which is a newly constructed VLBI network in Japan (Kobayashi et al . 2003). The main goal of our study is to measure the absolute proper motions and distances to nearby molecular clouds within 1 kpc from the Sun, to reveal their 3-dimensional structures and dynamical properties. Using the VERA dual-beam receiving system (Honma et al . 2003), we have carried out phase-referencing VLBI observations and measured annual parallaxes and absolute proper motions of the H 2 O maser features with respect to the extragalactic radio sources. We have successfully detected the annual parallax of one of the H 2 O maser features in Orion KL to be 2.29±0.10 mas, corresponding to the distance of 437±19 pc from the Sun (Hirota et al . 2007). In addition, the annual parallax of SVS13 in NGC 1333 is also determined to be4.10±0.17 mas, corresponding to the distance of 244±10 pc from the Sun, although the life time of the maser features are only 6 months. The absolute proper motions of the H 2 O maser features associated with Orion KL and NGC 1333 are derived, possibly indicating the outflow motions from the YSOs as well as the systemic motions of the powering sources." @default.
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- W2029284492 date "2007-03-01" @default.
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- W2029284492 title "Astrometry of H2O maser sources in nearby molecular clouds with VERA" @default.
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