Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201..123m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 1, July 1988, p. 123-130.
Astronomy and Astrophysics
Astrophysics
50
Ammonia, H Ii Regions, Interstellar Masers, Interstellar Matter, Star Formation, Water Masers, Emission Spectra, Molecular Clouds, Molecular Spectra, Protostars
Scientific paper
Observations of metastable and non-metastable NH3 transitions with energies up to 940K above the ground state toward W3(OH) are presented. The spectra consist of emission from -47.5 km s-1 and narrow absorption at -44.5 km s-1. The absorption lines, which are coincident in position with the region of OH masers, arise in a 95K hot compact gas clump. The emission, which is coincident with the H2O maser region 7arcsec east of the compact H II region, is hotter and less homogeneous. The rotational temperatures of NH3 emission rise from about 27K to more than 500K. The emission line core has a density distribution proportional r-3 and may surround a (proto-) stellar object. The detection of a maser in the (6, 5) transition is also reported.
Henkel Carsten
Mauersberger Rainer
Wilson Thomas L.
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