Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..596h&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 596-601.
Astronomy and Astrophysics
Astronomy
71
Ammonia, Molecular Clouds, Radio Sources (Astronomy), Stellar Mass Ejection, Water Masers, Astronomical Maps, B Stars, Condensates, Early Stars, Gas Heating, H Ii Regions, High Temperature Gases, Molecular Spectra, O Stars, Orion Nebula
Scientific paper
VLA observations of the (J, K) = (3,3) inversion line of NH3 toward the distant H II region complex in W51 are presented. Three small (about 0.1 pc), warm (about 100 K) NH3 condensations are found coincident with every one of the H20 and OH maser sources in the region. This positional emission arises from dense molecular condensations which are interacting with the mass outflows from young stars in these regions. These observations also represent the first direct detection of such high gas temperatures outside the Orion-KL region. Gas heating could be due to the radiation from the exciting sources of the compact H II regions and masers or from the input of mechanical energy due to the outflows. These warm condensations are embedded in a cooler and more extended envelope which dominates lower angular resolution studies.
Das Arnab
Genzel Reinhard
Ho Pak Tung
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