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Populations of highly excited carbon and observations of decametre carbon lines

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Abstract:

The populations of highly excited carbon are analytically described as functions of line number, temperature and density of the medium. Allowing for the process of dielectronic recombination, the balance equations for the highly excited carbon populations are solved to obtain the bn factors. To determine the temperature and the density of the medium from the experimental amplification coefficients, a system of boundary condition equations is formulated as (∂2bn/∂n2)|n=n1 = 0. The populations are found analytically in the temperature range Te = (25 − 100) × 104 K and compared with the numerical solutions. By using the intensity ratios of the radio lines for the observations at frequencies of 34.5 − 25 MHz, the magnitudes of the densities for Cassiopeia A are calculated as function of temperature.

Keywords: C II regions; Highly excited populations; Radio recombination lines of carbon

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/1055679031000086568

Publication date: August 1, 2003

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