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Sputtering in interstellar shocks: a model for heavy element depletion

BARLOW, MJ; SILK, J; (1977) Sputtering in interstellar shocks: a model for heavy element depletion. Astrophysical Journal , 211 L83-L87. 10.1086/182346. Green open access

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Abstract

High-velocity (at least 100 km/s) shock fronts are found to provide an environment where grains can be destroyed by thermal sputtering. Application is made to supernova remnants. Sputtering of refractory grains in shocks associated with high-velocity clouds leads to cosmic abundances of heavy elements and if followed by deceleration of the high-velocity gas and dilution with ambient depleted matter. A correlation of depletion with systematic velocity is predicted. It is proposed that there is a residual underlying depletion associated with refractory grain formation and a subsequent trapping of gas-phase metallic species by adsorption. Sputtering of adsorbed monolayers in intermediate-velocity shocks (not exceeding 50 km/s) can account for a range of depletions in diffuse interstellar matter.

Type: Article
Title: Sputtering in interstellar shocks: a model for heavy element depletion
Open access status: An open access version is available from UCL Discovery
DOI: 10.1086/182346
Publisher version: https://doi.org/10.1086/182346
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Absorption; Heavy Elements; Interstellar Matter; Shock Wave Propagation; Sputtering; Supernova Remnants; Abundance; Granular Materials; Propagation Velocity; Shock Fronts; Astrophysics
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096230
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