Dust-cooling--induced Fragmentation of Low-metallicity Clouds

Details Dust-cooling--induced Fragmentation of Low-metallicity Clouds Dust-cooling--induced Fragmentation of Low-metallicity Clouds

2006-03-17

arxiv.org/abs/astro-ph/0603470v1

Astrophys.J.642:L61-L64,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, ApJ Letters in press

Scientific paper

10.1086/504290

Dynamical collapse and fragmentation of low-metallicity cloud cores is studied using three-dimensional hydrodynamical calculations, with particular attention devoted whether the cores fragment in the dust-cooling phase or not. The cores become elongated in this phase, being unstable to non-spherical perturbation due to the sudden temperature decrease. In the metallicity range of 10^{-6}-10^{-5}Z_sun, 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.

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