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Lya is a key diagnostic for numerous observations of distant star-forminggalaxies. It's interpretation requires, however, detailed radiation transfermodels. We provide an extensive grid of 3D radiation transfer models simulatingthe Lya and UV continuum radiation transfer in the interstellar medium ofstar-forming galaxies. We have improved our Monte Carlo MCLya code, and haveused it to compute a grid of 6240 radiation transfer models for homogeneousspherical shells containing HI and dust surrounding a central source. Thesimulations cover a wide range of parameter space. We present the detailedpredictions from our models including in particular the Lya escape fractionfesc, the continuum attenuation, and detailed Lya line profiles. The Lya escapefraction is shown to depend strongly on dust content, but also on otherparameters (HI column density and radial velocity). The predicted line profilesshow a great diversity of morphologies ranging from broad absorption lines toemission lines with complex features. The results from our simulations aredistributed in electronic format. Our models should be of use for theinterpretation of observations from distant galaxies, for other simulations,and should also serve as an important base for comparison for future, morerefined, radiation transfer models.

Grid of Lya radiation transfer models for the interpretation of distant galaxies