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Title: Stimulated emission of carbon recombination lines from cold clouds in the direction of Cassiopeia A
Authors: Payne, H.E.
Anantharamaiah, K.R.
Erickson, W.C.
Keywords: carbon
cassiopeia A
line spectra
molecular clouds
radio sources (astronomy)
recombination reactions
stimulated emission
H II regions
ion production rates
quantum numbers
Issue Date: 15-Jun-1989
Publisher: The University of Chicago Press for the American Astronomical Society
Citation: Astrophysical Journal, 1989, Vol.341, p 890-900
Abstract: Observations made at 10 frequencies in the 34-325-MHz range provide evidence for stimulated emission of carbon recombination lines in the direction of Cas A. Recombination lines have been detected in absorption below 115 MHz and in emission above 200 MHz. The observed intensities and widths of the lines have been employed to determine the properties of the intervening clouds and to constrain theoretical predictions of level populations in high quantum number states of carbon in cold clouds.
ISSN: 0004-637X
1538-4357 (online)
Alternative Location:
Copyright: (1989) by the American Astronomical Society. Scanned images provided by the NASA ADS Data System.
Appears in Collections:Research Papers (A&A)

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