Molecules and masers near compact H II regions

Details Molecules and masers near compact H II regions Molecules and masers near compact H II regions

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..473f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 473-480.

Astronomy and Astrophysics

Astrophysics

28

H Ii Regions, Interstellar Masers, Star Formation, Water Masers, Emission Spectra, Hydroxyl Radicals, Ion Recombination, Line Spectra, Molecular Spectra

Scientific paper

Nine compact H II regions with OH/H2O masers were observed in hydrogen recombination line and molecular line emission at 40, 90 and 110 GHz with the Nobeyama 45 m telescope. The recombination line emission occurs at a velocity offset with respect to the molecular lines by typically + or - 6 km/s. High-velocity H2O masers tend to occur at velocities shifted in the opposite sense from the recombination lines. It is suggested that the molecular gas is relatively stationary in these star-forming regions, and the ionized hydrogen is expanding asymmetrically into regions of lower density. High-velocity H2O masers move in the direction of increasing density, probably excited by collisions with ambient molecular material.

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