Computer Science
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..707b&link_type=abstract
Nature, vol. 287, Oct. 23, 1980, p. 707, 708.
Computer Science
26
Absorption Spectra, Cassiopeia A, Line Spectra, Nitrogen Atoms, Stellar Spectra, Abundance, Atom Concentration, Atomic Recombination, Carbon, H Alpha Line, Ionized Gases, Quantum Numbers, Spectral Line Width
Scientific paper
Consideration is given to the nature of the 26.131-MHz absorption line attributed to an anomalously high concentration of nitrogen in the direction of Cassiopeia A. It is shown that the absorption can be accounted for by the 631 alpha recombination line of carbon in diffuse clouds at 26.126 MHz or a heavier atom (Mg, Ca, Fe) in hot, ionized gas at 26.127 MHz in transitions of very large principle quantum number. Such transitions would require an excitation temperature near the local thermodynamic equilibrium value, which is shown to be possible in the presence of collisions and the galactic background, and would imply a line strength of 6/sec, in agreement with observations. The linewidth of the C631 alpha line is also calculated to be compatible with the observed value of 2 kHz, indicating that it is the most likely identification for the 26.131 MHz line towards Cas A.
Blake D. H.
Crutcher Richard M.
Watson William D.
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