The effect of catastrophic collisional fragmentation and diffuse medium accretion on a computational interstellar dust system

Details The effect of catastrophic collisional fragmentation and diffuse medium accretion on a computational interstellar dust system The effect of catastrophic collisional fragmentation and diffuse medium accretion on a computational interstellar dust system

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355..518l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 355, June 1, 1990, p. 518-535.

Statistics

Computation

8

Accretion Disks, Computational Astrophysics, Cosmic Dust, Interstellar Matter, Molecular Clouds, Chemical Evolution, Monte Carlo Method, Nuclear Fusion, Particle Size Distribution, Shock Waves, Supernovae

Scientific paper

The effects of catastrophic collisional fragmentation and diffuse medium accretion on a the interstellar dust system are computed using a Monte Carlo computer model. The Monte Carlo code has as its basis an analytic solution of the bulk chemical evolution of a two-phase interstellar medium, described by Liffman and Clayton (1989). The model is subjected to numerous different interstellar processes as it transfers from one interstellar phase to another. Collisional fragmentation was found to be the dominant physical process that shapes the size spectrum of interstellar dust. It was found that, in the diffuse cloud phase, 90 percent of the refractory material is locked up in the dust grains, primarily due to accretion in the molecular medium. This result is consistent with the observed depletions of silicon. Depletions were found to be affected only slightly by diffuse cloud accretion.

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