Stimulated emission of carbon recombination lines from cold clouds in the direction of cassiopeia A

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 l...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 341; no. 2; pp. 890 - 900
Main Authors PAYNE, H. E, ANANTHARAMAIAH, K. R, ERICKSON, W. C
Format Journal Article
LanguageEnglish
Published Chicago, IL University of Chicago Press 01.06.1989
Subjects
640105 - Astrophysics & Cosmology- Galaxies
Astronomy
CARBON
CHEMICAL COMPOSITION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COSMIC GASES
COSMIC RADIO SOURCES
Earth, ocean, space
ELEMENTS
EMISSION
ENERGY-LEVEL TRANSITIONS
Exact sciences and technology
FLUIDS
GASES
H2 REGIONS
INTERSTELLAR SPACE
MOLECULES
NONMETALS
QUANTUM NUMBERS
Radio sources
RECOMBINATION
SPACE
Stellar systems. Galactic and extragalactic objects and systems. The universe
STIMULATED EMISSION
Unidentified sources and radiation outside the solar system
Absorption line
Radio recombination line
Stimulated emission
Population inversion
H I region
Emission line
Carbon
Radio observation
Galactic radiosource
Spectral line width
Supernova remnant
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Summary: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. 33 refs.
ISSN:0004-637X
1538-4357
DOI:10.1086/167547