The neutral interface adjoining theHII region DR21 |
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Authors: | J P Vallée |
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Institution: | (1) Astronomy Section, Herzberg Institute of Astrophysics, National Research Council of Canada, Ottawa, Ontario, Canada |
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Abstract: | Observations of C100 and C125 atomic carbon recombination lines were made at the Algonquin Radio Observatory, towards the neutral interface separating theHii region DR21 (at RA=20h37m14s, Dec=+42°09 00 ) from its associated molecular cloud. An analysis of the Cn observations in conjunction with a simple model of a neutral interface enabled the derivation of the following parameters: electron density of 300 cm–3, electron temperature of 30 K, microturbulent velocity of 2.3 km s–1, and depth of the neutral interface of 0.01 pc. A single,stimulated emission model is sufficient to reproduce the Cn observations in the wavelength range from 4.6 cm (C100 ) to 21 cm (C166 ). All the known Cn data do support a pressure equilibrium between the neutral interface and theHii region, after the usual allowance is made for carbon depletion on grains. |
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