Low-mass galaxy formation and the ionizing photon budget during reionization

Low-mass galaxy formation and the ionizing photon budget during reionization
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低质量星系的形成和再电离过程中的电离光子预算

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发表时间:
2014
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影响因子:
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通讯作者:
G. Poole
G. Poole
中科院分区:
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文献类型:
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作者:
A. Duffy;J. Wyithe;S. Mutch;G. Poole

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摘要我们使用高分辨率的宇宙学体积模拟来模拟高红移下的星系形成,目的是研究再电离的光子收支。我们证明,星系形成模型,包括一个强大的,热耦合超新星计划再现当前观测的星星形成率和speci c星星形成率,无论是在电离时代期间和之后。这些模型产生足够的紫外光子,以维持再电离在z.8(z.6)通过一个显着的populationof微弱的,未观察到的,星系假设逃逸分数为20%(5%)。这个预测的人口是一致的外推的暗端观察到的紫外光度函数。我们发现,再电离后来自全球紫外/X射线背景的加热导致星系中全球总星星形成率密度低于当前观测阈值。最后,虽然目前观察到的spe-ci c星星形成率不能在超新星反馈模型之间区分,但最近的深度观测将能够在未来使用这种诊断来研究高红移的星系形成.关键词:黑暗时代,再电离,流体动力学模拟-星系:演化-星系:形成
ABSTRACT We use high resolution simulations of cosmological volumes to model galaxy forma-tion at high redshift, with the goal of studying the photon budget for reionisation. Wedemonstrate that galaxy formation models that include a strong, thermally coupledsupernovae scheme reproduce current observations of star formation rates and speci cstar formation rates, both during and after the reionisation era. These models produceenough UV photons to sustain reionisation at z.8 (z.6) through a signi cant popu-lation of faint, unobserved, galaxies for an assumed escape fraction of 20% (5%). Thispredicted population is consistent with extrapolation of the faint end of observed UVluminosity functions. We nd that heating from a global UV/X-ray background afterreionisation causes a dip in the total global star formation rate density in galaxiesbelow the current observational threshold. Finally, while the currently observed spe-ci c star formation rates are incapable of di erentiating between supernovae feedbackmodels, suciently deep observations will be able to use this diagnostic in the futureto investigate galaxy formation at high redshift.Key words: dark ages, reionisation, hydrodynamical simulations - galaxies: evolution- galaxies: formation
DOI: 10.1088/0067-0049/192/2/18
发表时间: 2011-02-01
影响因子: 8.7
作者:
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者: Wright, E. L.
DOI: 10.1051/0004-6361/201219507
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McCracken, H. J.;Milvang-Jensen, B.;Zabl, J.
通讯作者: Zabl, J.