Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..128w&link_type=abstract
Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 128-142. Research supported by the Owens Valley Radio Observatory, Co
Astronomy and Astrophysics
Astronomy
62
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.
Garcia-Barreto Antonio J.
Matsakis Demetrios N.
Walker Robert Craig
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