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arXiv 1402.0888astro-ph.COastro-ph.GA
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MassiveBlack-II模拟:晕和星系团到z~0的演化

The MassiveBlack-II Simulation: The Evolution of Halos and Galaxies to z~0

Nishikanta Khandai, Tiziana Di Matteo, Rupert Croft, Stephen M. Wilkins, Yu Feng, Evan Tucker, Colin DeGraf, Mao-Sheng Liu

摘要:

(arXiv的摘要)我们在高分辨率流体动力学模拟MassiveBlack-II(MBII)中研究了z=0时晕、星系和黑洞的性质,该模拟在共动体积Vbox=100(Mpc/h)^[3]中演化出LCDM宇宙学。MBII是这个尺寸的最高分辨率模拟,其中包括恒星形成,黑洞吸积和相关反馈的自洽模型。我们提供了一个模拟浏览器的网络应用程序,使交互式搜索和标记的晕,subhalos和他们的属性,并公开发布我们的星系目录。我们对MBII中的晕质量函数(MF)的分析表明,重子具有很强的影响,与基于仅暗物质模拟的拟合相比,在MF的膝盖以下(在z=0时,Mhalo < 10^13.2 Msun/h),晕丰度的变化为20-35%。我们提供了一个拟合函数的晕MF红移z=11,并讨论如何发病的非普遍性的MF限制了我们的拟合精度。我们研究了晕占据分布和星系团,特别是随机性和偏差的演化和尺度依赖性,发现与观测数据的合理协议。MBII预测的宇宙光谱能量分布的形状与观测结果一致,但幅度较低。星系恒星质量函数(GSMF)函数与z>=2时的观测结果大致一致。在z<2时,MBII中被动低质量(M*<10^9兆太阳)星系的数量使得GSMF与观测值相比过于陡峭,而在高质量端(M*>10^11兆太阳),拥有明亮活动星系核的星系对GSMF有显著贡献。类星体的热光度函数也与观测结果基本一致。然而,我们注意到,更有效的活动星系核反馈(除了这里使用的简单的热耦合)可能是必要的最大的,最稀有的对象/集群在低红移。

英文摘要:

(Abridged for arXiv)We investigate the properties of halos, galaxies and blackholes to z=0 in the high resolution hydrodynamical simulation MassiveBlack-II (MBII) which evolves a LCDM cosmology in a comoving volume Vbox=100(Mpc/h)^3. MBII is the highest resolution simulation of this size which includes a self-consistent model for star formation, black hole accretion and associated feedback. We provide a simulation browser web application which enables interactive search and tagging of halos, subhalos and their properties and publicly release our galaxy catalogs. Our analysis of the halo mass function (MF) in MBII reveals that baryons have strong effects, with changes in the halo abundance of 20-35% below the knee of the MF (Mhalo < 10^13.2 Msun/h at z=0) when compared to fits based on dark matter only simulations. We provide a fitting function for the halo MF out to redshift z=11 and discuss how the onset of non-universality in the MF limits the accuracy of our fit. We study the halo occupation distribution and clustering of galaxies, in particular the evolution and scale dependence of stochasticity and bias finding reasonable agreement with observational data. The shape of the cosmic spectral energy distribution predicted by MBII is consistent with observations, but lower in amplitude. The Galaxy Stellar Mass Function (GSMF) function is broadly consistent with observations at z>=2. At z<2, the population of passive low mass (for M*<10^9 Msun) galaxies in MBII makes the GSMF too steep compared to observations whereas at the high mass end (M*>10^11 Msun) galaxies hosting bright AGNs make significant contributions to the GSMF. The quasar bolometric luminosity function is also largely consistent with observations. We note however that more efficient AGN feedback (beyond simple thermal coupling used here) is likely necessary for the largest, rarest objects/clusters at low redshifts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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