Forecast of neutrino cosmology from the CSST photometric galaxy clustering and cosmic shear surveys
Forecast of neutrino cosmology from the CSST photometric galaxy clustering and cosmic shear surveys
复制标题
通过 CSST 光度星系团和宇宙剪切巡天预测中微子宇宙学
DOI：
10.1093/mnras/stac2126
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发表时间：
2022-03
期刊：
影响因子：
--
通讯作者：
Hu Zhan
中科院分区：
文献类型：
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作者：
Hengjie Lin;Yan Gong;Xuelei Chen;Kwan Chuen Chan;Zuhui Fan;Hu Zhan
中国空间站望远镜（CSST）是我国即将进入第四阶段的强大天基光学巡天设备。预计它将以极高的精度探索一些重要的宇宙学问题。利用CSST测光星系团和宇宙剪切巡天（3 × 2 pt）的模拟数据，研究了在具有常数暗能量状态方程（wCDM）的冷暗物质模型下中微子质量和其他宇宙学参数的约束.分析中还包括星系偏置、测光红移不确定性、内禀排列、剪切校准、重子反馈、非线性和仪器效应等系统学。我们基于COSMOS星表生成模拟数据，考虑CSST的仪器效应和观测效应，并利用马尔可夫链蒙特卡罗方法进行约束。与目前的类似观测结果相比，CSST 3 × 2pt巡天观测对宇宙学参数的约束至少提高了一个数量级。如果我们忽略重子效应，我们可以得到中微子质量之和的上限，在68%（95%）置信水平（CL）下为0.36（0.56）eV，在68%（95%）置信水平（CL）下为0.23（0.29）eV，这与普朗克的结果相当，比目前的测光测量要好得多。这表明CSST测光巡天可以对中微子质量和其他宇宙学参数提供严格的约束，并且可以通过引入其他类型CSST宇宙学巡天的数据来进一步改进结果。
ABSTRACT China Space Station Telescope (CSST) is a forthcoming powerful Stage IV space-based optical survey equipment. It is expected to explore a number of important cosmological problems in extremely high precision. In this work, we focus on investigating the constraints on neutrino mass and other cosmological parameters under the model of cold dark matter with a constant equation of state of dark energy (wCDM), using the mock data from the CSST photometric galaxy clustering and cosmic shear surveys (i.e. 3 × 2 pt). The systematics from galaxy bias, photometric redshift uncertainties, intrinsic alignment, shear calibration, baryonic feedback, non-linear, and instrumental effects are also included in the analysis. We generate the mock data based on the COSMOS catalogue considering the instrumental and observational effects of the CSST, and make use of the Markov chain Monte Carlo method to perform the constraints. Comparing to the results from current similar measurements, we find that CSST 3 × 2 pt surveys can improve the constraints on the cosmological parameters by one order of magnitude at least. We can obtain an upper limit for the sum of neutrino mass Σmν ≲ 0.36 (0.56) eV at 68 per cent (95 per cent) confidence level (CL), and Σmν ≲ 0.23 (0.29) eV at 68 per cent (95 per cent) CL if we ignore the baryonic effect, which is comparable to the Planck results and much better than the current photometric surveys. This indicates that the CSST photometric surveys can provide stringent constraints on the neutrino mass and other cosmological parameters, and the results also can be further improved by including data from other kinds of CSST cosmological surveys.