Dust-cooling-induced fragmentation of low-metallicity clouds

Toru Tsuribe; Kazuyuki Omukai

doi:10.1086/504290

Dust-cooling-induced fragmentation of low-metallicity clouds

Toru Tsuribe, Kazuyuki Omukai

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	L61-L64
Journal	Astrophysical Journal
Volume	642
Issue number	1 II
DOIs	https://doi.org/10.1086/504290
Publication status	Published - 2006 May 1
Externally published	Yes

Keywords

Cosmology: Theory
Hydrodynamics
Instabilities
Stars: Formation

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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title = "Dust-cooling-induced fragmentation of low-metallicity clouds",

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.",

keywords = "Cosmology: Theory, Hydrodynamics, Instabilities, Stars: Formation",

author = "Toru Tsuribe and Kazuyuki Omukai",

note = "Funding Information: Numerical computations were carried out on VPP5000 at the Astronomical Data Analysis Center of the National Astronomical Observatory of Japan and in the computational facilities at Osaka University. This research was supported in part by Grant-in-Aid for Young Scientists (B) 14740129 (T. T.) by the Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT).",

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doi = "10.1086/504290",

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T1 - Dust-cooling-induced fragmentation of low-metallicity clouds

AU - Tsuribe, Toru

AU - Omukai, Kazuyuki

N1 - Funding Information: Numerical computations were carried out on VPP5000 at the Astronomical Data Analysis Center of the National Astronomical Observatory of Japan and in the computational facilities at Osaka University. This research was supported in part by Grant-in-Aid for Young Scientists (B) 14740129 (T. T.) by the Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT).

PY - 2006/5/1

Y1 - 2006/5/1

N2 - 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.

AB - 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.

KW - Cosmology: Theory

KW - Hydrodynamics

KW - Instabilities

KW - Stars: Formation

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JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 II

ER -

Dust-cooling-induced fragmentation of low-metallicity clouds

Abstract

Keywords

ASJC Scopus subject areas

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