Misc,

Influence of turbulence on Lyman-alpha scattering

, and .
(2022)cite arxiv:2208.13103.

Abstract

We develop a Monte Carlo radiative transfer code to study the effect of turbulence with a finite correlation length on scattering of Lyman-alpha (Ly$\alpha$) photons propagating through neutral atomic hydrogen gas. We investigate how the effective mean free path, the emergent spectrum, and the average number of scatterings that Ly$\alpha$ photons experience change in the presence of turbulence. We find that the correlation length is an important and sensitive parameter, which can significantly, by orders of magnitude, reduce the number of scattering events that the average Ly$\alpha$ photon undergoes before it escapes the turbulent cloud. This can have consequences for the effectiveness of the Wouthuysen-Field coupling of the spin temperature to Ly$\alpha$ radiation as well as affect the polarization of the scattered photons.

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