Cosmological distance forecasts for the CSST Galaxy Survey using BAO peaks  

作　　者：Feng Shi Jieyi Tian Zhejie Ding Xiaohu Yang Yizhou Gu Christoph Saulder Xiaoping Li Yanming Liu Zitong Wang Hu Zhan Ming Li Xiaolei Li Hong Guo Yan Gong Yunkun Han Cheng Li Yipeng Jing Jipeng Sui Run Wen Gong-Bo Zhao Hu Zou Pengjie Zhang Xianzhong Zheng Xingchen Zhou 

机构地区：[1]School of Aerospace Science and Technology,Xidian University,Xi’an 710126,China [2]Shaanxi Key Laboratory of Space Extreme Detection,Xidian University,Xi’an 710126,China [3]Department of Astronomy,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [4]Tsung-Dao Lee Institute&School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [5]Key Laboratory for Particle Physics,Astrophysics and Cosmology(MoE),and Shanghai Key Laboratory for Particle Physics and Cosmology,Shanghai Jiao Tong University,Shanghai 200240,China [6]Max Planck Institute for Extraterrestrial Physics,Garching 85748,Germany [7]Universit¨ats-Sternwarte M¨unchen,Munich 81679,Germany [8]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [9]The Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China [10]College of Physics,Hebei Normal University,Shijiazhuang 050024,China [11]Key Laboratory for Research in Galaxies and Cosmology,Shanghai Astronomical Observatory,Shanghai 200030,China [12]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China [13]Department of Astronomy,Tsinghua University,Beijing 100084,China [14]Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing,210023,China [15]School of Astronomy and Space Sciences,University of Science and Technology of China,Hefei 230026,China [16]Tsung-Dao Lee Institute and Key Laboratory for Particle Physics,Astrophysics and Cosmology,Ministry of Education,Shanghai Jiao Tong University,Shanghai 201210,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2025年第4期228-243,共16页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by the National SKA Program of China(Grant Nos.2022SKA0110200 and 2022SKA0110202);the National Key Research and Development Program of China(Grant Nos.2023YFA1607800,2023YFA1607802,2023YFA1607804,and 2022YFF0503400);the National Natural Science Foundation of China(Grant Nos.12103037 and12273020);the 111 Project(Grant No.B20019);Shanghai Natural Science Foundation(Grant No.19ZR1466800);the science research grants from the China Manned Space Project(Grant Nos.CMS-CSST-2021-A02,CMS-CSST-2021-A03,and CMS-CSST-2021-B01);the Fundamental Research Funds for the Central Universities(Grant No.XJS221312);supported by Science Research Project of Hebei Education Department No.BJK2024134;supported by the High-Performance Computing Platform of Xidian University。

摘　　要：The measurement of cosmological distances using baryon acoustic oscillations(BAO)is crucial for studying the universe’s expansion.The China Space Station Telescope(CSST)galaxy redshift survey,with its vast volume and sky coverage,provides an opportunity to address key challenges in cosmology.However,redshift uncertainties in galaxy surveys can degrade both angular and radial distance estimates.In this study,we forecast the precision of BAO distance measurements using mock CSST galaxy samples,applying a two-point correlation function(2PCF)wedge approach to mitigate redshift errors.We simulate redshift uncertainties of σ_(0)=0.003 andσ_(0)=0.006,representative of expected CSST errors,and examine their effects on the BAO peak and distance scaling factors,α_(⊥)andα_(||),across redshift bins within 0.0<z≤1.0.The wedge 2PCF method proves more effective in detecting the BAO peak compared with the monopole 2PCF,particularly forσ_(0)=0.006.Constraints on the BAO peaks show thatα_(⊥)is well constrained around 1.0,regardless of σ_(0),with precision between 1%and 3%across redshift bins.In contrast,α_(||)measurements are more sensitive to increases inσ_(0).Forσ_(0)=0.003,the results remain close to the fiducial value,with uncertainties ranging between 4%and 9%;forσ_(0)=0.006,significant deviations from the fiducial value are observed.We also study the ability to measure parameters(Ω_(m),H_(0)r_(d))using distance measurements,proving robust constraints as a cosmological probe under CSST-like redshift uncertainties.These findings demonstrate that the CSST survey enables few-percent precision measurements of D_(A)using the wedge 2PCF method,highlighting its potential to place tight constraints on the universe’s expansion history and contribute to high-precision cosmological studies.

关 键 词：large-scale structure distance scale COSMOLOGY 

分 类 号：P15[天文地球—天文学]