Dust coagulation in star formation with different metallicities

Hiroyuki Hirashita, Kazuyuki Omukai

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Dust grains coagulate into larger aggregates in dense gas. This changes their size distribution and possibly affects the thermal evolution of star-forming clouds. We here investigate dust coagulation in collapsing pre-stellar cores with different metallicities by considering the thermal motions of grains. We show that coagulation does occur even at low metallicity ∼10-6 Z. However, we also find (i) that the H2 formation rate on dust grains is reduced only after the majority of H2 is formed and (ii) that the dust opacity is modified only after the core becomes optically thick. Therefore, we conclude that the effects of dust coagulation can safely be neglected in discussing the temperature evolution of the pre-stellar cores for any metallicity as long as the grain motions are thermal.

Original languageEnglish
Pages (from-to)1795-1801
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume399
Issue number4
DOIs
Publication statusPublished - 2009 Nov
Externally publishedYes

Keywords

  • Dust, extinction
  • Galaxies: evolution
  • Galaxies: high-redshift
  • ISM: abundances
  • Molecular processes
  • Stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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