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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