H2O masers in W49N. I - Maps

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Maps, Interstellar Matter, Nebulae, Water Masers, H Ii Regions, Hydrogen Ions, Power Spectra, Radiant Flux Density, Radio Sources (Astronomy), Stellar Evolution

Scientific paper

Multiple point fringe rate mapping of the H2O masers found in the H II region W49N is presented. The masers were observed with the three-element interferometer consisting of the Haystack 37-m, the National Radio Astronomy Observatory 43-m, and the Owens Valley Radio Observatory 40-m telescopes. The resulting map contains 386 separate features separated by up to 4.0 arcsec. Positive and negative high-velocity features are well separated, and isolated features are found outside the centers of activity noted in earlier observations. The data suggest the entire region to be excited by a single star, with the clusters of features representing the interaction of material accelerated by the star up to velocities of up to a few hundred km/sec with a surrounding stationary or slowly moving medium.

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