A Grid Based Method for the Radiation Transfer from Multiple Point Sources in the Late Redshift Universe

Statistics – Computation

Scientific paper

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Scientific paper

We use the first moment of the radiation transfer equation, applied in the cosmic intergalactic medium conditions, to solve for the energy density of the radiation field. The radiation pressure tensor, Pij, due to the primary radiation fluxes, is calculated in the optically thin regime and used for the estimate of the spatial distribution of the Eddington factors through the anzantz, fij=(Pij)/(Tr(Pij). Our objective is to treat the radiation transfer problem from multiple point sources within the computational volume of a cosmological density field using a conservative discretization scheme for the moment equation. The presence of a multidute of ionizing sources in the late redshift universe can thus be simulated through the transport of the radiation flux emanating from such sources and the effect they have on the properties of the intergalactic medium can be studied. We present tests of single and multiple sources within in a constant density hydrogen medium, and a shadowing test of a point source flux from a gaussian blob. Finally, we present the preliminary results from the propagation of such field in a cosmological density distribution. The results are in agreement with the ones obtained from the single point source equation of a fixed radial Eddington factor component frr=1..

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