Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....96..230c&link_type=abstract
Astronomy and Astrophysics, vol. 96, no. 1-2, Mar. 1981, p. 230-234.
Astronomy and Astrophysics
Astrophysics
11
Astronomical Spectroscopy, H Ii Regions, Hydrogen Ions, Hydroxyl Emission, Interstellar Masers, Microwave Spectra, Angular Distribution, Circular Polarization, Electromagnetic Scattering, Velocity Distribution
Scientific paper
The spectra of the hydroxyl mainlines in the H II regions W 49 OH, W 51 OH, and ON 1 have been observed. These OH spectra reveal the following: (1) many new, weak, narrow, non-LTE emission and absorption features, some of which are highly circularly polarized and are good candidates for a Zeeman splitting study; (2) OH within the regions forms a velocity spread of up to 120 km/s; (3) kinematic activity is most likely responsible for these OH velocity spreads; non-Doppler (scattering, etc.) explanations are unlikely; (4) there is a preponderance of OH emission maser features which are blueshifted with respect to the systemic velocity of the H II regions; (5) the intervening extended absorption features in W 49 OH at 64 and 40 km/s have small velocity widths, and are surrounded in velocity by a cluster of weaker features; the 64 km/s feature has the maximum optical depth of 0.1; and (6) the 5 km/s extended absorption feature in W 51 OH is not in LTE.
Cohen Norman L.
Willson Robert F.
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