论文标题

Sibelius-dark:来自约束实现模拟的本地音量的星系目录

SIBELIUS-DARK: a galaxy catalogue of the Local Volume from a constrained realisation simulation

论文作者

McAlpine, Stuart, Helly, John C., Schaller, Matthieu, Sawala, Till, Lavaux, Guilhem, Jasche, Jens, Frenk, Carlos S., Jenkins, Adrian, Lucey, John R., Johansson, Peter H.

论文摘要

我们提出了Sibelius-dark,这是对局部体积的限制实现模拟,距离银河系的距离为200 〜MPC。 Sibelius-dark是\ textit {simulation of the Local Universe}(Sibelius)项目的首次研究,该项目的目的是将模型的本地组样系统嵌入正确的宇宙环境中。模拟是仅深度的,使用星系形成的半分析模型计算出星系群,Galform。我们证明,从西贝里乌斯(Sibelius)限制的初始条件出现的大规模结构与观察数据匹配。 Sibelius-Dark的推断星系种群也很好地匹配了观测数据,既统计学上的整体量,又是按对象的基础,对于最庞大的群集而言。例如,$ k $ - 频带的数量在整个天空中都计算,而当北部和南部银河半球之间分开时,Sibelius-dark很好地繁殖了。我们发现,在$λ$ CDM的更广泛情况下,本地卷有些不寻常:它包含异常数量的超质量群集,以及相对于宇宙平均值的$ \%\%\%的总体大规模低密度。但是,尽管很少见,但这些特殊性的程度并没有显着挑战$λ$ CDM模型。 Sibelius-Dark是迄今为止对本地卷的最全面的约束实现模拟,我们将以$ z = 0 $公开发布Halo和Galaxy目录,我们希望这对更广泛的天文学社区有用。

We present SIBELIUS-DARK, a constrained realisation simulation of the local volume to a distance of 200~Mpc from the Milky Way. SIBELIUS-DARK is the first study of the \textit{Simulations Beyond The Local Universe} (SIBELIUS) project, which has the goal of embedding a model Local Group-like system within the correct cosmic environment. The simulation is dark-matter-only, with the galaxy population calculated using the semi-analytic model of galaxy formation, GALFORM. We demonstrate that the large-scale structure that emerges from the SIBELIUS constrained initial conditions matches well the observational data. The inferred galaxy population of SIBELIUS-DARK also match well the observational data, both statistically for the whole volume and on an object-by-object basis for the most massive clusters. For example, the $K$-band number counts across the whole sky, and when divided between the northern and southern Galactic hemispheres, are well reproduced by SIBELIUS-DARK. We find that the local volume is somewhat unusual in the wider context of $Λ$CDM: it contains an abnormally high number of supermassive clusters, as well as an overall large-scale underdensity at the level of $\approx 5$\% relative to the cosmic mean. However, whilst rare, the extent of these peculiarities does not significantly challenge the $Λ$CDM model. SIBELIUS-DARK is the most comprehensive constrained realisation simulation of the local volume to date, and with this paper we publicly release the halo and galaxy catalogues at $z=0$, which we hope will be useful to the wider astronomy community.

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