Deuterium fractionation in the Horsehead edge ⋆

Abstract

Context. Deuterium fractionation is known to enhance the [DCO + ]/[HCO + ] abundance ratio over the D/H∼10 −5 elemental ratio in the cold and dense gas typically found in pre-stellar cores. Aims. We report the first detection and mapping of very bright DCO + J=3–2 and J=2–1 lines (3 and 4 K respectively) towards the Horsehead photodissociation region (PDR… (More)

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