论文标题
仅流体动力学对$λ$ cdm富群尺寸的暗物质晕的Subhalo人群的影响
The effect of hydrodynamics alone on the subhalo population in a $Λ$CDM rich cluster sized dark matter halo
论文作者
论文摘要
我们对Phoenix项目的富含簇大小的暗物质光环进行了一组非辐射性水力动力（NHD）模拟，并具有3种不同的数值分辨率，以研究单独的流体动力学对晕halo子Halo种群的影响。与仅对暗物质的（DMO）模拟相比，相对较大的子呼吸器（$ m_ {sub}> 2.5 \ times 10^9H^{ - 1} m _ {\ odot} $，或$ v_ {max}> 70 kms^nhhhe，模拟。这会在Subhalo质量/$ v_ {max} $中产生不同的形状，以两组不同的模拟功能。在给定的subhalo质量下，subhaloes比$ 10^{10} h^{ - 1} m _ {\ odot} $在NHD中的$ v_ {max} $大于DMO模拟，而$ v_ {max} $与subholes相似的质量值大于质量值。这主要是因为当今低质量亚李的祖细胞在NHD中比DMO模拟具有更大的浓度参数。在红移2处，主要光环的积分低质量祖细胞的存活数分数比DMO模拟高约50％。
We perform a set of non-radiative hydro-dynamical (NHD) simulations of a rich cluster sized dark matter halo from the Phoenix project with 3 different numerical resolutions, to investigate the effect of hydrodynamics alone on the subhalo population in the halo. Compared to dark matter only (DMO) simulations of the same halo, subhaloes are less abundant for relatively massive subhaloes ($M_{sub} > 2.5 \times 10^9h^{-1}M_{\odot}$, or $V_{max} > 70 kms^{-1}$) but more abundant for less massive subhaloes in the NHD simulations. This results in different shapes in the subhalo mass/$V_{max}$ function in two different sets of simulations. At given subhalo mass, the subhaloes less massive than $10^{10} h^{-1}M_{\odot}$ have larger $V_{max}$ in the NHD than DMO simulations, while $V_{max}$ is similar for the subhaloes more massive than the mass value. This is mainly because the progenitors of present day low mass subhaloes have larger concentration parameters in the NHD than DMO simulations. The survival number fraction of the accreted low mass progenitors of the main halo at redshift 2 is about 50 percent higher in the NHD than DMO simulations.
