Dust-cooling-induced fragmentation of low-metallicity clouds

Toru Tsuribe, Kazuyuki Omukai

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

We study the dynamical collapse and fragmentation of low-metallicity cloud cores using three-dimensional hydrodynamical calculations, and we devote particular attention to whether or not the cores fragment in the dust-cooling phase. The cores become elongated in the dust-cooling phase because they are unstable to nonspherical perturbation due to the sudden temperature decrease. In the metallicity range of 10-6 to 10-5 Z, cores with an initial axis ratio ≳2 reach a critical value of the axis ratio (≳30) and fragment into multiple small clumps. This provides a possible mechanism to produce low-mass stars in ultra-metal-poor environments.

Original languageEnglish
Pages (from-to)L61-L64
JournalAstrophysical Journal
Volume642
Issue number1 II
DOIs
Publication statusPublished - 2006 May 1
Externally publishedYes

Keywords

  • Cosmology: Theory
  • Hydrodynamics
  • Instabilities
  • Stars: Formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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