view Abstract Citations (43) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Distribution and Kinematics of Ammonia in the Orion-KL Nebula: High-Sensitivity VLA Maps of the NH 3(3,2) Line Migenes, V. ; Johnston, K. J. ; Pauls, T. A. ; Wilson, T. L. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1989 DOI: 10.1086/168118 Bibcode: 1989ApJ...347..294M Keywords: Ammonia; Astronomical Spectroscopy; Kinematics; Orion Nebula; Star Formation; Emission Spectra; Molecular Rotation; Spectral Line Width; Stellar Mass; Thermal Emission; Very Large Array (Vla); Astrophysics; INTERSTELLAR: MOLECULES; RADIO SOURCES: SPECTRA; STARS: FORMATION full text sources ADS | data products SIMBAD (1)
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Migenes et al. (1989) studied this question.