Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..409l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 203, Apr. 1983, p. 409-417.
Astronomy and Astrophysics
Astronomy
22
Astronomical Maps, Interstellar Masers, Molecular Clouds, Molecular Spectra, Water Masers, Ammonia, Carbon Monoxide, Gas Expansion, H Ii Regions, Mass Distribution, Self Absorption, Spectral Line Width, Stellar Evolution, Stellar Winds
Scientific paper
A comparison of J = 2→1 12CO/13CO maps and H2O maser observations with an already existing NH3 map of the molecular cloud G35.2-0.74 reveals several interesting features. Estimates for the mass of the cloud of a few times 103M_sun; are obtained from both 13CO and NH3. The cloud contains at least two water masers. Near the northern H2O source, the 12CO spectra show self-absorption effects together with a fairly wide velocity emission. A further H2O maser is found 3 arcmin to the south, near a compact H II region. Line splitting by 3-4 km s-1 is here observed in the 13CO, NH3 and H2O spectra. If the line splitting represents expansion, then momentum considerations suggest that it is more likely to be driven by a stellar wind than by radiation pressure from the star exciting the H II region.
Brown Thad A.
Cohen Richard J.
Little Leslie T.
Macdonald G. H.
Matthews N.
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