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Cosmic ray dissociation of molecular hydrogen and dense cloud chemistry

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arxiv 2010.13703 v2 pith:ULKDW2GB submitted 2020-10-19 astro-ph.GA

classification astro-ph.GA
keywords molecularsecondarychemistrycosmicdissociationelectronshydrogenpredictions
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Dissociation of molecular hydrogen by secondary electrons produced by cosmic ray or X-ray ionization plays a crucial role in the chemistry of the densest part of molecular clouds. Here we study the effect of the mean kinetic energy of secondary electrons on this process. We compare predictions using a range of secondary electron energies and predictions of the cross-sections with the values in the UMIST database. We find that the predicted column densities change by nearly one dex.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Resolving dense photo-dissociation regions: the structure of photochemical fronts in three-dimensional gas distributions

    astro-ph.GA 2026-08 conditional novelty 7.0 of 10

    A three-dimensional PDR model shows that overlapping H2 dissociation and C+ recombination fronts, plus the arc-like H2 emission seen in the Orion Bar, arise from shadowing by dense clumps in a fractal gas distribution.

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