Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..163k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 10, 1991, p. 163-170.
Other
5
Ammonia, Early Stars, Gravitational Collapse, H Ii Regions, Molecular Clouds, Spectral Signatures, Absorption Spectra, Astronomical Spectroscopy, Emission Spectra, Red Shift, Very Large Array (Vla)
Scientific paper
Low and high angular resolution observations of NH3 around molecular cloud cores containing ultracompact H II regions are compared. Comparison of low angular resolution spectra of two different sources suggests that the spectra contain recognizable information on the kinematic structures of molecular cloud cores. In particular, the respective redshifting and blueshifting of the absorption lines with respect to the emission lines are the signatures of mass infall and mass outflow. Two new techniques of spectral line analysis are demonstrated: one is a simple inversion of the observed optical depth to determine the temperature and density of the cloud as radial power laws, and the other is a numerical simulation of the single-dish spectra from three-dimensional model cloud with a general temperature, density, and velocity structure.
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