Population of highly excited carbon levels and the nature of the low-frequency radio line formation regions toward Cassiopeia A

Details Population of highly excited carbon levels and the nature of the low-frequency radio line formation regions toward Cassiopeia A Population of highly excited carbon levels and the nature of the low-frequency radio line formation regions toward Cassiopeia A

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pazh...13...19e&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 13, Jan. 1987, p. 19-26. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

5

Carbon, Cassiopeia A, Ion Recombination, Molecular Excitation, Radio Spectra, Spectral Line Width, Astronomical Spectroscopy, Low Frequencies, Molecular Clouds, Ultraviolet Radiation

Scientific paper

Observations of the C552α (39 MHz), C486α/C612β (57 MHz), C421α/C530β (88 MHz) and C382α/C481β (118 MHz) carbon radio recombination lines toward Cas A indicate significant deviation of the corresponding level populations from the equilibrium values. The radio lines have Doppler width of 15.9±1.5 km/s and most likely are the result of synthesis of the narrow lines originating in the outer envelopes of molecular clouds having different radial velocities. Carbon in the envelopes is ionized by diffuse ultraviolet radiation 912 Å < λ < 1101 Å.

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