Energetic Processing of Interstellar Silicate Grains by Cosmic Rays

Bringa, E M; Kucheyev, S O; Loeffler, M J; Baragiola, R A; Dai, Z R; Graham, G; Bajt, S; Bradley, J; Dukes, C A; Felter, T E; Torres, D F; van Breugel, W

doi:10.1086/517865

Title: Energetic Processing of Interstellar Silicate Grains by Cosmic Rays

Journal Article · Wed Mar 28 00:00:00 EDT 2007 · Astrophysical Journal

DOI:https://doi.org/10.1086/517865· OSTI ID:940864

Bringa, E M; Kucheyev, S O; Loeffler, M J; Baragiola, R A; Dai, Z R; Graham, G; Bajt, S; Bradley, J; Dukes, C A; Felter, T E; Torres, D F; van Breugel, W

While a significant fraction of silicate dust in stellar winds has a crystalline structure, in the interstellar medium nearly all of it is amorphous. One possible explanation for this observation is the amorphization of crystalline silicates by relatively 'low' energy, heavy ion cosmic rays. Here we present the results of multiple laboratory experiments showing that single-crystal synthetic forsterite (Mg{sub 2}SiO{sub 4}) amorphizes when irradiated by 10 MeV Xe{sup ++} ions at large enough fluences. Using modeling, we extrapolate these results to show that 0.1-5.0 GeV heavy ion cosmic rays can rapidly ({approx}70 Million yrs) amorphize crystalline silicate grains ejected by stars into the interstellar medium.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 940864

Report Number(s):: UCRL-JRNL-229546; ASJOAB; TRN: US0807228

Journal Information:: Astrophysical Journal, Vol. 662, Issue 1; ISSN 0004-637X

Country of Publication:: United States

Language:: English

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