Compact H II regions - Hydrogen recombination and OH maser lines

Details Compact H II regions - Hydrogen recombination and OH maser lines Compact H II regions - Hydrogen recombination and OH maser lines

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..681g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 15, 1985, p. 681-697.

Astronomy and Astrophysics

Astronomy

101

H Ii Regions, Hydroxyl Emission, Interstellar Masers, Radio Sources (Astronomy), Stellar Evolution, Astronomical Coordinates, Astronomical Models, Hydrogen Recombinations, Radial Velocity, Radio Spectra, Very Long Base Interferometry

Scientific paper

Hydrogen recombination lines at 15 and 22 GHz and hydroxyl (OH) maser emission at 1.6 GHz have been mapped toward nine compact H II regions using the VLA. The authors find that all OH masers have radial velocities which are redshifted from the velocities of the H II regions as deduced from their hydrogen recombination lines. The majority of the maser spots appear projected onto the most compact H II region in a complex. These observations are inconsistent with models in which the masers form in an expanding, shocked shell, and they are explained most simply if the OH maser sources are part of a remnant envelope which is still collapsing toward the newly formed star.

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