Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..279b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 2, Dec. 1983, p. 279-290.
Astronomy and Astrophysics
Astrophysics
146
Ammonia, Astronomical Spectroscopy, Molecular Clouds, Stellar Evolution, Astronomical Maps, Radial Velocity, Spectral Line Width, Spectral Sensitivity, Thermodynamic Equilibrium
Scientific paper
The present map of temperature and radial velocity distributions for ammonia in the (1, 1) and (2, 2) inversion lines over the OMC-1/2 region indicates at least eight strong and clearly distinct peaks. High sensitivity spectra in the (1, 1), (2, 2), (3, 3), (4, 4) and (2, 1) lines have been taken toward these sources. The hyperfine ratios in other NH3 spectra are consistent with Local Thermodynamic Equilibrium. From these spectra and an excitation model, kinetic temperatures and source sizes have been determined. The latter are consistent with measured sizes from the present line map. From the line widths and source sizes, masses and gas densities were obtained by means of the Virial theorem. The total mass in the gas phase is estimated from maps of the dust emission made in the IR. Theories of cloud stability and fragmentation are compared with these results.
Bastien Pierre
Batrla Wolfgang
Ruf K.
Wilson Thomas L.
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