Other
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..294m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 294-301.
Other
41
Ammonia, Astronomical Spectroscopy, Kinematics, Orion Nebula, Star Formation, Emission Spectra, Molecular Rotation, Spectral Line Width, Stellar Mass, Thermal Emission, Very Large Array (Vla)
Scientific paper
VLA maps of the (J,K) = (3,2) rotation-inversion line of NH3 toward the Orion-KL nebula are presented which show that the emission is clumped on roughly 1 arcsec scales. There are 11 distinct fragments with peak intensities more than seven times the rms noise. The observations give a qualitatively different picture of the fragmentation process on scales of 10 to the 16th cm. Apparently, turbulent motions within the individual clumps are small, and most of the kinetic energy is contained in orbital motion. For VLA observations, it is found that the (3,2) line spectra agree better with spectra of other nonmetastable (J greater than K) lines than with metastable (J = K) lines. This confirms that the nonmetastable and metastable NH3 lines are formed in different regions of the 'hot core'. The maps show that the structure in the 'hot core' is consistent with a clumpy cylinder whose axis is inclined at about 40 deg east of north and expanding at 10 km/s.
Johnston Ken J.
Migenes Victor
Pauls Thomas A.
Wilson Thomas L.
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