THE GENERATION OF STRONG MAGNETIC FIELDS DURING THE FORMATION OF THE FIRST STARS

被引：165

作者：

Sur, Sharanya ^{[1
]}

Schleicher, D. R. G. ^{[2
,3
]}

Banerjee, Robi ^{[1
]}

Federrath, Christoph ^{[1
]}

Klessen, Ralf S. ^{[1
,4
]}

机构：

[1] Heidelberg Univ, Zentrum Astron, Inst Theoret Astrophys, D-69120 Heidelberg, Germany

[2] ESO Garching, D-85748 Garching, Germany

[3] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[4] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Menlo Pk, CA 94025 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 721卷 / 02期

关键词：

cosmology: theory; early universe; magnetic fields; methods: numerical; stars: formation; turbulence; SIMULATIONS; FRAGMENTATION; TURBULENCE; DYNAMOS; EVOLUTION; OUTFLOWS; GALAXIES; UNIVERSE; ORIGIN;

D O I：

10.1088/2041-8205/721/2/L134

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cosmological hydrodynamical simulations of primordial star formation suggest that the gas within the first star-forming halos is turbulent. This has strong implications on the subsequent evolution, in particular on the generation of magnetic fields. Using high-resolution numerical simulations, we show that in the presence of turbulence, weak seed magnetic fields are exponentially amplified by the small-scale dynamo during the formation of the first stars. We conclude that strong magnetic fields are generated during the birth of the first stars in the universe, potentially modifying the mass distribution of these stars and influencing the subsequent cosmic evolution. We find that the presence of the small-scale turbulent dynamo can only be identified in numerical simulations in which the turbulent motions in the central core are resolved with at least 32 grid cells.

引用

页码：L134 / L138

页数：5

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[1] The formation of the first star in the universe [J].