1Shanghai Astronomical Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Shanghai 200030
2Department of Astronomy, Nanjing University, Nanjing 210093
3Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008
High-Velocity H2O Masers Associated Massive Star Formation
Regions
1Shanghai Astronomical Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Shanghai 200030
2Department of Astronomy, Nanjing University, Nanjing 210093
3Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008
Abstract： We report on the results of 12CO (1-0) emission associated with H2O masers and massive star formation regions to identify high-velocity H2O masers. Several masers have a large blue-shift, even up to 120km.s-1, with respect to the CO peak, but no large redshifted maser appears. This result suggests that high-velocity H2O masers can most probably occur in high mass star-forming regions and quite a number of masers stem from the amplifications of a background source, which may enable those undetectable weak masers to become to an observable level.
2001, Vol. 18 
