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The turbulent life of dust grains in the supernova-driven, multiphase interstellar medium

Peters, Thomas, Zhukovska, Svitlana, Naab, Thorsten, Girichidis, Philipp, Walch, Stefanie, Glover, Simon. C. O., Klessen,, Ralf S., Clark, Paul ORCID: and Seifried, Daniel 2017. The turbulent life of dust grains in the supernova-driven, multiphase interstellar medium. Monthly Notices of the Royal Astronomical Society 467 (4) , pp. 4322-4342. 10.1093/mnras/stx341

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Dust grains are an important component of the interstellar medium (ISM) of galaxies. We present the first direct measurement of the residence times of interstellar dust in the different ISM phases, and of the transition rates between these phases, in realistic hydrodynamical simulations of the multiphase ISM. Our simulations include a time-dependent chemical network that follows the abundances of H+, H, H2, C+ and CO and take into account self-shielding by gas and dust using a tree-based radiation transfer method. Supernova explosions are injected either at random locations, at density peaks, or as a mixture of the two. For each simulation, we investigate how matter circulates between the ISM phases and find more sizeable transitions than considered in simple mass exchange schemes in the literature. The derived residence times in the ISM phases are characterized by broad distributions, in particular for the molecular, warm and hot medium. The most realistic simulations with random and mixed driving have median residence times in the molecular, cold, warm and hot phase around 17, 7, 44 and 1 Myr, respectively. The transition rates measured in the random driving run are in good agreement with observations of Ti gas-phase depletion in the warm and cold phases in a simple depletion model. ISM phase definitions based on chemical abundance rather than temperature cuts are physically more meaningful, but lead to significantly different transition rates and residence times because there is no direct correspondence between the two definitions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: methods: numerical – ISM: clouds – dust, extinction – ISM: evolution – galaxies: ISM – galaxies: star formation.
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 23 May 2017
Date of Acceptance: 7 February 2017
Last Modified: 14 Nov 2023 04:26

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