Halo and subhalo demographics with Planck cosmological parameters: Bolshoi–Planck and MultiDark–Planck simulations
Halo and subhalo demographics with Planck cosmological parameters: Bolshoi–Planck and MultiDark–Planck simulations
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DOI：
10.1093/mnras/stw1705
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发表时间：
2016-02
影响因子：
4.8
通讯作者：
A. Rodríguez-Puebla;P. Behroozi;J. Primack;A. Klypin;Christoph T. Lee;Doug Hellinger University of California;Santa Cruz;U. California;Berkeley;N. University;L. Cruces
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文献类型：
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作者：
A. Rodríguez-Puebla;P. Behroozi;J. Primack;A. Klypin;Christoph T. Lee;Doug Hellinger University of California;Santa Cruz;U. California;Berkeley;N. University;L. Cruces
我们报告并提供拟合函数的丰富的暗物质晕和subhalos作为质量，圆速度和红移的函数从新的Bolshoi-普朗克和MultiDark-PlanckCDM宇宙学模拟，基于普朗克宇宙学参数。我们还报道了晕的质量吸积率，这可能与星系星星的形成率。我们发现，更高的宇宙学物质密度的普朗克参数相比，WMAP参数导致更高丰度的大质量晕在高红移。我们发现晕自旋参数λB = J（2 MvirRvirVvir）1几乎与红移无关，导致星系大小的预测演化与观测一致，而晕自旋参数λP = J随着红移的显著减小|E| 1/2 G 1 M 5/2预测星系尺寸的减小比观测到的要多。利用星系速度和质量之间的Tully-Fisher和Faber-Jackson关系，我们证明了一个简单的星系速度与晕最大圆速度相关的模型，随着红移超过z-1，导致宇宙恒星质量密度的过度预测增加，这意味着这种速度-质量关系必须在红移z > z-1时改变。通过一个现实的模型，如何观察到的星系速度与晕圆速度，我们表明，最近的光学和无线电观测的丰富的星系是在很好的协议与我们的CDM模拟。我们的光环人口统计数据基于Rockstar和Consistent Trees代码的更新版本，本文包括解释其所有输出的附录。本文是一系列相关论文的介绍，介绍了Bolshoi-Planck和MultiDark-Planck模拟的其他分析。
We report and provide fitting functions for the abundance of dark matter halos and subhalos as a function of mass, circular velocity, and redshift from the new Bolshoi- Planck and MultiDark-PlanckCDM cosmological simulations, based on the Planck cosmological parameters. We also report the halo mass accretion rates, which may be connected with galaxy star formation rates. We show that the higher cosmological matter density of the Planck parameters compared with the WMAP parameters leads to higher abundance of massive halos at high redshifts. We find that the median halo spin parameter λB = J(2MvirRvirVvir) 1 is nearly independent of redshift, leading to predicted evolution of galaxy sizes that is consistent with observations, while the significant decrease with redshift in median λP = J|E| 1/2 G 1 M 5/2 predicts more decrease in galaxy sizes than is observed. Using the Tully-Fisher and Faber-Jackson relations between galaxy velocity and mass, we show that a simple model of how galaxy velocity is related to halo maximum circular velocity leads to increasing overprediction of cosmic stellar mass density as redshift increases beyond redshifts z � 1, implying that such velocity-mass relations must change at redshifts z > � 1. By making a realistic model of how observed galaxy velocities are related to halo circular velocity, we show that recent optical and radio observations of the abundance of galaxies are in good agreement with ourCDM simulations. Our halo demographics are based on updated versions of the Rockstar and Consistent Trees codes, and this paper includes appendices explaining all of their outputs. This paper is an introduction to a series of related papers presenting other analyses of the Bolshoi-Planck and MultiDark-Planck simulations.