The spatial relationship of OH and H2O masers

Details The spatial relationship of OH and H2O masers The spatial relationship of OH and H2O masers

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..339f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 339-350.

Astronomy and Astrophysics

Astrophysics

190

Hydroxyl Emission, Interstellar Masers, Star Formation, Water Masers, H Ii Regions, Interstellar Magnetic Fields, Maser Outputs, Star Clusters, Very Large Array (Vla)

Scientific paper

The absolute positions of about 70 OH/H2O masers associated with star-forming regions were determined, using VLA, to an estimated accuracy of about 0.5 arcsec rms. The extent and displacement of OH and H2O maser emission, and the spatial relationship of the masers and compact H II regions for the sample as a whole are discussed. The observations show that the OH and H2O molecular species generally occur close together and in compact groups less than about 30 mpc in diameter. While the complex OH/H2O maser associations may be interpreted either as a dense cluster of young stars or as a collection of masing molecular clumps associated with a single star, it is argued that the latter is probably the case. A scenario for star formation is suggested, which places various types of maser associations in an evolutionary sequence.

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