论文标题
系统学对未来星系簇调查的宇宙学参数的影响
Impact of systematics on cosmological parameters from future Galaxy Clusters surveys
论文作者
论文摘要
星系簇是最近的宇宙学探针。从这些对象推论的宇宙学参数的精确性和准确性受群集物理知识的影响，通过质量观察的缩放关系进入分析，以及对其质量和红移分布的理论描述，由质量函数建模。在这项工作中，我们预测了这些成分的不同建模对未来光学和近红外调查检测到的簇的影响。我们考虑了标准的宇宙学场景和案例，具有时间依赖于黑暗能量的状态方程。我们分析了提高准确性对缩放关系校准的影响，从而提高了对宇宙参数的约束。这种较高的准确性暴露了质量函数评估的影响，这是当前数据的系统源。我们比较了质量函数的两个不同评估。在两种宇宙学场景中，使用不同质量功能的使用都会导致参数约束。对于$λ$ CDM型号，我们在$（ω_m，σ_8）$参数平面和$ \ sim 7 \，σ$的差异中找到了$ 1.6 \，σ$ shift，用于扩展关系的散布的红移演变。对于具有随时间不断变化的状态的情景，不同质量函数的假设会导致$ \ sim 8 \，σ$张力在$ W_0 $参数中。这些结果表明，在星系簇的宇宙学分析中，质量函数的红移演化与缩放关系的红移演化之间的相互作用的影响和必要性。
Galaxy clusters are a recent cosmological probe. The precision and accuracy of the cosmological parameters inferred from these objects are affected by the knowledge of cluster physics, entering the analysis through the mass-observable scaling relations, and the theoretical description of their mass and redshift distribution, modelled by the mass function. In this work, we forecast the impact of different modelling of these ingredients for clusters detected by future optical and near-IR surveys. We consider the standard cosmological scenario and the case with a time-dependent equation of state for dark energy. We analyse the effect of increasing accuracy on the scaling relation calibration, finding improved constraints on the cosmological parameters. This higher accuracy exposes the impact of the mass function evaluation, which is a subdominant source of systematics for current data. We compare two different evaluations for the mass function. In both cosmological scenarios, the use of different mass functions leads to biases in the parameter constraints. For the $Λ$CDM model, we find a $1.6 \, σ$ shift in the $(Ω_m,σ_8)$ parameter plane and a discrepancy of $\sim 7 \, σ$ for the redshift evolution of the scatter of the scaling relations. For the scenario with a time-evolving dark energy equation of state, the assumption of different mass functions results in a $\sim 8 \, σ$ tension in the $w_0$ parameter. These results show the impact, and the necessity for a precise modelling, of the interplay between the redshift evolution of the mass function and of the scaling relations in the cosmological analysis of galaxy clusters.
