Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.129..339v&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 129, no. 2, Jan. 1987, p. 339-351.
Astronomy and Astrophysics
Astrophysics
6
Atomic Recombination, Carbon, H Ii Regions, Interfaces, Molecular Clouds, Neutral Gases, Astronomical Models, Astronomical Spectroscopy, Electron Density (Concentration), Electron Energy, Radio Spectra
Scientific paper
Observations of C100-alpha and C125-alpha atomic carbon recombination lines were made at the Algonquin Radio Observatory, towards the neutral interface separating the H II region DR21 from its associated molecular cloud. An analysis of the Cn-alpha observations in conjunction with a simple model of a neutral interface enabled the derivation of the following parameters: electron density of 300/cu cm, electron temperature of 30 K, microturbulent velocity of 2.3 km/s, and depth of the neutral interface of 0.01 pc. A single, stimulated emission model is sufficient to reproduce the Cn-alpha observations in the wavelength range from 4.6 cm (C100-alpha) to 21 cm (C166-alpha). All the known Cn-alpha data do support a pressure equilibrium between the neutral interface and the H II region, after the usual allowance is made for carbon depletion on grains.
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