The warm CII region between the hot ionized region S64=W40 and the cold molecular cloud G 28.74+3.52.
Abstract
Observations at the Algonquin Radio Observatory of carbon C 100α and C 125α atomic recombination lines were made towards the warm C II region sandwiched between the cold molecular cloud G 28.74+3.52 and the ionized emission nebula W40/Sharpless 64 (R.A. = 18h28m49s, DEC = -02°07arcmin36arcsec). Using a simple model of a C II region, the following parameters were derived from the Cnα observations: electron density of 1 cm-3, electron temperature of 100K, microturbulent velocity of 4 km s-1, and depth of the C II region of 0.01 pc. A single, stimulated emission model is sufficient to explain the data in the wavelength range from λ4.6 cm (C 100α) to λ 21 cm (C 166α). The observed data are consistent with a pressure equilibrium between the C II region ad the H II region, and no significant velocity difference between the C II region and the CO cloud.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 1987
- Bibcode:
- 1987A&A...178..237V
- Keywords:
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- Astronomical Spectroscopy;
- Carbon;
- Molecular Clouds;
- Nebulae;
- Plasma Temperature;
- Abundance;
- Atomic Recombination;
- H Ii Regions;
- Line Spectra;
- Radio Spectra;
- Astrophysics