SCORCH. I. THE GALAXY–HALO CONNECTION IN THE FIRST BILLION YEARS
SCORCH. I. THE GALAXY–HALO CONNECTION IN THE FIRST BILLION YEARS
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DOI：
10.1088/0004-637x/813/1/54
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
H. Trac;R. Cen;Philip Mansfield
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文献类型：
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作者：
H. Trac;R. Cen;Philip Mansfield
CORCH(宇宙氢再电离的模拟和构造)是研究再电离时代(EOR)的一个新项目。在第一篇论文中，我们探索了观测到的高红移星系和模拟的暗物质晕之间的联系，以更好地了解电离辐射的主要来源。高分辨率的N体模拟被用来量化暗物质晕的丰度，它是质量M、吸积率M和红移z的函数。一个新的晕质量函数Dn/Dm的拟合在高质量端的精度比≈高20%。用晕质量函数来拟合晕吸积速率函数dN/dM·？利用观测到的星系光度函数进行丰度匹配来估算星系的光度-质量关系和光度-吸积率关系。推导出的恒星形成效率不是单调的，而是在特征质量∼为2×1011M⊙~(-1)，特征吸积率∼为6×102M⊙yr~(-1)~gt~(-1)时达到极大值。我们找到了一个普遍的增率光度-吸积率关系，并建立了星系光度函数的基准模型。谢克特参数的演变使得φ⋆？>；减小，M⋆？>；变暗，而α在高红移时变得更陡峭。我们对即将到来的詹姆斯韦伯太空望远镜进行了预测，结果表明，在表观星等极限m AB≈31？>；(32)的情况下，它可以观测到≳11？>；(24)每平方度单位红移至少到M⋆？>；在z≲13(14)的未透镜星系。
SCORCH (Simulations and Constructions of the Reionization of Cosmic Hydrogen) is a new project to study the Epoch of Reionization (EoR). In this first paper, we probe the connection between observed high-redshift galaxies and simulated dark matter halos to better understand the primary source of ionizing radiation. High-resolution N-body simulations are run to quantify the abundance of dark matter halos as a function of mass M, accretion rate M ˙ , ?> and redshift z. A new fit for the halo mass function dn/dM is ≈20% more accurate at the high-mass end. A novel approach is used to fit the halo accretion rate function dn / d M ˙ ?> in terms of the halo mass function. Abundance matching against the observed galaxy luminosity function is used to estimate the luminosity–mass relation and the luminosity–accretion-rate relation. The inferred star formation efficiency is not monotonic with M nor M ˙ , ?> but reaches a maximum value at a characteristic mass ∼ 2 × 10 11 M ⊙ ?> and a characteristic accretion rate ∼ 6 × 10 2 M ⊙ yr - 1 ?> at z ≈ 6. We find a universal EoR luminosity–accretion-rate relation and construct a fiducial model for the galaxy luminosity function. The Schechter parameters evolve such that φ ⋆ ?> decreases, M ⋆ ?> is fainter, and α is steeper at higher redshifts. We forecast for the upcoming James Webb Space Telescope and show that with apparent magnitude limit m AB ≈ 31 ?> (32), it can observe ≳ 11 ?> (24) unlensed galaxies per square degree per unit redshift at least down to M ⋆ ?> at z ≲ 13 (14).