Improved Fokker-Planck Equation for Resonance Line Scattering

Details Improved Fokker-Planck Equation for Resonance Line Scattering Improved Fokker-Planck Equation for Resonance Line Scattering

2006-03-02

arxiv.org/abs/astro-ph/0603047v1

Astrophys.J.647:709-718,2006

Astronomy and Astrophysics

Astrophysics

10 pages, no figures, submitted to ApJ

Scientific paper

10.1086/505327

A new Fokker-Planck equation is developed for treating resonance line scattering, especially relevant to the treatment of Lyman alpha in the early universe. It is a "corrected" form of the equation of Rybicki & Dell'Antonio that now obeys detailed balance, so that the approach to thermal equilibrium is properly described. The new equation takes into account the energy changes due to scattering off moving particles, the recoil term of Basko, and stimulated scattering. One result is a surprising unification of the equation for resonance line scattering and the Kompaneets equation. An improved energy exchange formula due to resonance line scattering is derived. This formula is compared to previous formulas of Madau, Meikson, & Rees (1997) and Chen & Miralda-Escud\'e (2004).

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