A new exact method for line radiative transfer

Bibcode
2006MNRAS.365..779E
DOI
10.1111/j.1365-2966.2005.09770.x
Elitzur, Moshe; Asensio Ramos, Andrés
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 365, Issue 3, pp. 779-791.

Fecha de publicación:
1
2006
Revista
Monthly Notices of the Royal Astronomical Society
Número de autores
2
Número de autores del IAC
0
Número de citas
52
Número de citas referidas
46
Descripción
We present a new method, the coupled escape probability (CEP), for exact calculation of line emission from multi-level systems, solving only algebraic equations for the level populations. The CEP formulation of the classical two-level problem is a set of linear equations, and we uncover an exact analytic expression for the emission from two-level optically thick sources that holds as long as they are in the `effectively thin' regime. In a comparative study of a number of standard problems, the CEP method outperformed the leading line transfer methods by substantial margins. The algebraic equations employed by our new method are already incorporated in numerous codes based on the escape probability approximation. All that is required for an exact solution with these existing codes is to augment the expression for the escape probability with simple zone-coupling terms. As an application, we find that standard escape probability calculations generally produce the correct cooling emission by the CII 158-μm line but not by the 3P lines of OI.
Tipo
Con árbitro
Transferencia radiativa
Métodos

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