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Paper: High-Resolution Observations of Centimeter/(Sub)Millimeter H2O Masers in Orion KL with VERA and ALMA
Volume: 476, New Trends in Radio Astronomy in the ALMA Era
Page: 327
Authors: Hirota, T.; Tsuboi, M.; Fujisawa, K.; Honma, M.; Kawaguchi, N.; Kim, M. K.; Kobayashi, H.; Kurono, Y.; Imai, H.; Omodaka, T.; Shibata, K. M.; Shimoikura, T.; Yonekura, Y.
Abstract: We present the results of astrometry with VERA of the 22 GHz H2O maser burst in Orion KL started since 2011 February. According to the absolute positions and proper motions of the bursting H2O maser features, it is most likely that the outflow from the radio Source I or another young stellar object in the Compact Ridge is a possible origin of the burst. In addition, we report the first detection of the 232 GHz vibrationally excited H2O maser in star-forming regions by using the ALMA Science Verification data of Orion KL. The 232 GHz H2O maser is detected toward the Source I and its spectral profile shows a double-peaked structure analogous to the 22 GHz H2O and 43 GHz SiO masers. Thus, the 232 GHz H2O maser would be excited in the dense and hot gas around the Source I as in the case of other maser lines.
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