The influence of dielectronic-like recombination at low temperatures on the interpretation of interstellar, radio recombination lines of carbon

Details The influence of dielectronic-like recombination at low temperatures on the interpretation of interstellar, radio recombination lines of carbon The influence of dielectronic-like recombination at low temperatures on the interpretation of interstellar, radio recombination lines of carbon

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..317w&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 1, 1982, p. 317-325.

Astronomy and Astrophysics

Astronomy

53

Atomic Recombination, Carbon, Interstellar Radiation, Radio Astronomy, H Ii Regions, High Frequencies, Interstellar Gas, Low Frequencies, Low Temperature, Recombination Coefficient

Scientific paper

Calculations which include dielectronic-like captures due to fine structure excitations are presented at temperatures less than 100 K for the departure coefficients associated with the radio recombination lines of carbon. Results are presented for a wide range of principal quantum numbers (n equals 75-900) and are especially applicable in the context of two astronomical topics related to the interstellar gas: (1) the observation of low frequency absorption lines (n greater than 500), and (2) the relative strengths of carbon recombination lines at high and low frequencies in the direction of H II regions. It is shown that in diffuse interstellar clouds, the absorption line strength for alpha transitions near n equal 600 can be enhanced by factors of 50-100 due to dielectronic recombination. It is also shown that inclusion of the dielectronic process causes considerable modification of level populations in ionized carbon (C II) regions close to H II regions. This may explain the relatively 'flat' behavior of the observed carbon line intensity as a function of frequency.

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