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Marginal likelihoods of distances and extinctions to stars: computation and compact representation

Abstract : We present a method for obtaining the likelihood function of distance and extinction to a star given its photometry. The other properties of the star (its mass, age, metallicity and so on) are marginalized assuming a simple Galaxy model. We demonstrate that the resulting marginalized likelihood function can be described faithfully and compactly using a Gaussian mixture model. For dust mapping applications we strongly advocate using monochromatic over bandpass extinctions, and provide tables for converting from the former to the latter for different stellar types.
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S. E. Sale, J. Magorrian. Marginal likelihoods of distances and extinctions to stars: computation and compact representation. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2015, 448, pp.1738-1750. ⟨10.1093/mnras/stv068⟩. ⟨insu-03644976⟩

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