The molecular environment of H_2_O masers: VLA ammonia observations.

Details The molecular environment of H_2_O masers: VLA ammonia observations. The molecular environment of H_2_O masers: VLA ammonia observations.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..282c&link_type=abstract

Astronomy and Astrophysics, v.325, p.282-294

Astronomy and Astrophysics

Astrophysics

51

Masers, Stars: Formation, Interstellar Medium: Molecules, Radio Lines: Interstellar

Scientific paper

We present the results of single dish and interferometric observations of ammonia towards 5 sources selected from a sample of H_2_O and OH masers associated with star forming regions. The Medicina telescope was used to observe the NH_3_(1,1), (2,2), and (3,3) inversion transitions. High resolution maps in the NH_3_(2,2) and (3,3) lines and in the 1.3 cm continuum were then obtained with the Very Large Array. The main result of this research is to confirm the belief that H_2_O masers form in hot dense molecular cores which are sites of massive star formation. We also find evidence for the H_2_O maser phase to be prior to the appearance of an ultracompact HII region around the embedded high mass star(s).

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