Near optimal angular quadratures for polarised radiative transfer

Štěpán, Jiří; Jaume Bestard, Jaume; Trujillo Bueno, Javier
Referencia bibliográfica

Astronomy and Astrophysics

Fecha de publicación:
4
2020
Número de autores
3
Número de autores del IAC
2
Número de citas
9
Número de citas referidas
8
Descripción
In three-dimensional (3D) radiative transfer (RT) problems, the tensor product quadratures are generally not optimal in terms of the number of discrete ray directions needed for a given accuracy of the angular integration of the radiation field. In this paper, we derive a new set of angular quadrature rules that are more suitable for solving 3D RT problems with the short- and long-characteristics formal solvers. These quadratures are more suitable than the currently used ones for the numerical calculation of the radiation field tensors that are relevant in the problem of the generation and transfer of polarised radiation without assuming local thermodynamical equilibrium (non-LTE). We show that our new quadratures can save up to about 30% of computing time with respect to the Gaussian-trapezoidal product quadratures with the same accuracy.

The tables mentioned in Appendix A are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/636/A24

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