Aspects of frequency redistribution for non-coherent scattering in a turbulent medium

Mathematics – Probability

Scientific paper

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Electromagnetic Absorption, Frequency Distribution, Incoherent Scattering, Light Emission, Stellar Atmospheres, Turbulence Effects, Bubbles, Distribution Functions, Doppler Effect, Formulations, Integral Equations, Normal Density Functions, Photons, Spectral Line Width, Velocity Distribution

Scientific paper

The scattering of line photons in a turbulent medium is reexamined. We take into account the fact that a photon absorbed in a turbulent element having some velocity will be reemitted by the same element and keeps in that way a certain 'memory' of its absorption. Adding the contributions of all turbulent elements at a given point, we construct new redistribution functions describing this correlation. They give the probability that a photon with frequency x in the direction n is absorbed and reemitted at frequency x' in the direction n'. A preliminary discussion of the problem is given in an astrophysical context.

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