The 26.13-MHz absorption line toward Cassiopeia A

Details The 26.13-MHz absorption line toward Cassiopeia A The 26.13-MHz absorption line toward Cassiopeia A

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pazh....7..402k&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 7, July 1981, p. 402-405.) Soviet Astronomy Letters, vol. 7, July-Aug. 1981, p. 221-223

Astronomy and Astrophysics

Astronomy

6

Absorption Spectra, Cassiopeia A, Interstellar Matter, Molecular Absorption, Radio Sources (Astronomy), Astronomical Spectroscopy, Carbon, Hyperfine Structure, Interstellar Extinction, Line Spectra, Nitrogen, Radial Velocity, Radio Attenuation

Scientific paper

New observations confirm that the 26.13-MHz absorption line previously detected in the direction toward the radio source Cas A represents a carbon recombination line and not a hyperfine-structure nitrogen line. It is proposed that the lines are formed in singly ionized cold carbon instead of by dielectric recombination of heavier elements in some hot interstellar region. Observations made at decameter wavelengths toward certain other directions in the Galaxy over a considerable frequency range are also discussed.

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