We report on the results of ^(12)CO (1-0) emission associated with H2O masers and massive star formation regions to identify high-velocity H2O masers. Several masers have a large blueshift, even up to 120km·s^(-1...We report on the results of ^(12)CO (1-0) emission associated with H2O masers and massive star formation regions to identify high-velocity H2O masers. Several masers have a large blueshift, even up to 120km·s^(-1), with respect to the CO peak, but no large redshifted maser appears. This result suggests that high-velocity H_(2)O 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 come to an observable level.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19973017。
文摘We report on the results of ^(12)CO (1-0) emission associated with H2O masers and massive star formation regions to identify high-velocity H2O masers. Several masers have a large blueshift, even up to 120km·s^(-1), with respect to the CO peak, but no large redshifted maser appears. This result suggests that high-velocity H_(2)O 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 come to an observable level.