H2O masers in W49N. I. Maps

A multiple point fringe rate map of H2O masers in W49N is presented that shows the locations of 386 separate features. The principal results, readily apparent in the map, are the clear separation of positive and negative high-velocity features and the presence of isolated features outside the centers of activity noted in earlier observations. The distribution of features suggests that the masers are seen in regions where material, which has been accelerated near the central star to velocities of up to a few hundred km s-1, is interacting with a surrounding stationary or slowly moving medium