论文标题

中国空间站望远镜(CSST)的光度和光谱多探针调查的宇宙学约束精度

Cosmological Constraint Precision of the Photometric and Spectroscopic Multi-probe Surveys of China Space Station Telescope (CSST)

论文作者

Miao, Haitao, Gong, Yan, Chen, Xuelei, Huang, Zhiqi, Li, Xiao-Dong, Zhan, Hu

论文摘要

作为IV期空间望远镜之一,中国空间站望远镜(CSST)可以同时进行光度和光谱调查,以极高的精度有效地探索宇宙。在这项工作中,我们研究了几种功能强大的CSST宇宙学探针,包括宇宙剪切,星系 - 果胶镜头,光度和光谱星系聚类以及星系簇的数量计数,并通过预测关节约束对宇宙学参数的结果来研究这些探针的能力。通过参考实际观察结果,我们生成模拟数据并根据CSST观察和工具设计估算所测量的错误。为了研究系统对结果的影响,我们还考虑了CSST光度和光谱调查中的许多系统学,例如固有比对,剪切校准不确定性,光度测定红移不确定性,银河系偏见,非线性效果,非线性效应,工具效应,工具效应,渔夫矩阵方法,渔民矩阵方法,渔民矩阵的效果,渔民矩阵方法,渔民矩阵的影响力, 参数。我们发现,通过包括所有这些CSST宇宙学探针的联合限制可以显着改善当前观察结果的结果,至少可以通过一个数量级来改善$ω_m$和$σ_8$ $ $ <$ <$ 1%的精​​度,以及$ W_0 $和$ W_A $ $ $ $ $ $ <$ <$ 5%和20%的准确性。这表明CSST的光度和光谱性多探针调查可以提供强大的工具来探索宇宙,并大大改善相关宇宙学问题的研究。

As one of Stage IV space-based telescopes, China Space Station Telescope (CSST) can perform photometric and spectroscopic surveys simultaneously to efficiently explore the Universe in extreme precision. In this work, we investigate several powerful CSST cosmological probes, including cosmic shear, galaxy-galaxy lensing, photometric and spectroscopic galaxy clustering, and number counts of galaxy clusters, and study the capability of these probes by forecasting the results of joint constraints on the cosmological parameters. By referring to real observational results, we generate mock data and estimate the measured errors based on CSST observational and instrumental designs. To study the systematical effects on the results, we also consider a number of systematics in CSST photometric and spectroscopic surveys, such as the intrinsic alignment, shear calibration uncertainties, photometric redshift uncertainties, galaxy bias, non-linear effects, instrumental effects, etc. The Fisher matrix method is used to derive the constraint results from individual or joint surveys on the cosmological and systematical parameters. We find that the joint constraints by including all these CSST cosmological probes can significantly improve the results from current observations by one order of magnitude at least, which gives $Ω_m$ and $σ_8$ $<$1% accuracy, and $w_0$ and $w_a$ $<$5% and 20% accuracies, respectively. This indicates that the CSST photometric and spectroscopic multi-probe surveys could provide powerful tools to explore the Universe and greatly improve the studies of relevant cosmological problems.

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