Primordial star formation under far-ultraviolet radiation

研究成果: Article査読

196 被引用数 (Scopus)

抄録

Thermal and chemical evolution of primordial gas clouds irradiated with far-ultraviolet (FUV; hv < 13.6 eV) radiation is investigated. In clouds irradiated by intense FUV radiation, sufficient hydrogen molecules to be important for cooling are never formed. However, even without molecular hydrogen, if the clouds are massive enough, they start collapsing via atomic hydrogen line cooling. Such clouds continue to collapse almost isothermally owing to successive cooling by H- free-bound emission up to the number density of 1016 cm-3. Inside the clouds, the Jeans mass eventually falls well below a solar mass. This indicates that hydrogen molecules are dispensable for low-mass primordial star formation, provided that fragmentation of the clouds occurs at sufficiently high density.

本文言語English
ページ(範囲)635-651
ページ数17
ジャーナルAstrophysical Journal
546
2 PART 1
DOI
出版ステータスPublished - 2001 1月 10
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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