The 26.13 MHz absorption line in the direction of Cassiopeia A

Details The 26.13 MHz absorption line in the direction of Cassiopeia A The 26.13 MHz absorption line in the direction of Cassiopeia A

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294..135k&link_type=abstract

Nature, vol. 294, Nov. 12, 1981, p. 135, 136.

Astronomy and Astrophysics

Astronomy

24

Absorption Spectra, Carbon, Cassiopeia A, Interstellar Gas, Line Spectra, Radio Astronomy, Very High Frequencies, Hydrogen Clouds, Ion Recombination

Scientific paper

An investigation of the nature of the absorption line at a frequency of 26.13 MHz detected in the direction of Cassiopeia A is presented. In order to assess whether the absorption is due to a recombination line of carbon at 631 alpha, spectra were examined for the presence of adjacent recombination lines. Absorption lines corresponding to the C630 alpha and C640 alpha lines were detected at intensities close to that of the 26.13-MHz line, suggesting that the 26.23-MHz absorption is, indeed, a recombination line produced by a cold cloud of ionized carbon.

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