Primordial star formation under the influence of far ultraviolet radiation: 1540 cosmological haloes and the stellar mass distribution

被引:260
作者
Hirano, S. [1 ]
Hosokawa, T. [2 ,3 ]
Yoshida, N. [4 ,5 ]
Omukai, K. [6 ]
Yorke, H. W. [7 ]
机构
[1] Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan
[2] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
[3] Univ Tokyo, Res Ctr Early Universe, Bunkyo Ku, Tokyo 1130033, Japan
[4] Univ Tokyo, Dept Phys, Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan
[5] Univ Tokyo, Todai Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan
[6] Tohoku Univ, Astron Inst, Sendai, Miyagi 9808578, Japan
[7] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
基金
美国国家航空航天局;
关键词
methods: numerical; stars: formation; stars: luminosity function; mass function; stars: Population III; dark ages; reionization; first stars; POPULATION III STARS; MAGNETIC-FIELD AMPLIFICATION; COLD-DARK-MATTER; METAL-POOR STARS; 1ST STARS; PROTOSTELLAR FEEDBACK; EVOLUTION; 1ST-GENERATION; ACCRETION; IMPACT;
D O I
10.1093/mnras/stv044
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We perform a large set of cosmological simulations of early structure formation and follow the formation and evolution of 1540 star-forming gas clouds to derive the mass distribution of primordial stars. The star formation in our cosmological simulations is characterized by two distinct populations, the so-called Population III. 1 stars and primordial stars formed under the influence of far-ultraviolet (FUV) radiation (Population III. 2(D) stars). In this work, we determine the stellar masses by using the dependences on the physical properties of star-forming cloud and/or the external photo-dissociating intensity from nearby primordial stars, which are derived from the results of 2D radiation hydrodynamic simulations of protostellar feedback. The characteristic mass of the Pop III stars is found to be a few hundred solarmasses at z similar to 25, and it gradually shifts to lower masses with decreasing redshift. At high redshifts z > 20, about half of the star-forming gas clouds are exposed to intense FUV radiation and thus give birth to massive Pop III. 2(D) stars. However, the local FUV radiation by nearby Pop III stars becomes weaker at lower redshifts, when typical Pop III stars have smaller masses and the mean physical separation between the stars becomes large owing to cosmic expansion. Therefore, at z < 20, a large fraction of the primordial gas clouds host Pop III. 1 stars. At z less than or similar to 15, the Pop III.1 stars are formed in relatively cool gas clouds due to efficient radiative cooling by H-2 and HD molecules; such stars have masses of a few x 10 M-circle dot. Since the stellar evolution and the final fate are determined by the stellar mass, Pop III stars formed at different epochs play different roles in the early universe.
引用
收藏
页码:568 / 587
页数:20
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