Fisher forecast for the BAO measurements from the CSST spectroscopic and photometric galaxy clustering

Author:

Ding Zhejie12ORCID,Yu Yu12ORCID,Zhang Pengjie123

Affiliation:

1. Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai 200240 , China

2. Key Laboratory for Particle Astrophysics and Cosmology (MOE)/Shanghai Key Laboratory for Particle Physics and Cosmology , Shanghai 200240 , China

3. Tsung-Dao Lee Institute, Shanghai Jiao Tong University , Shanghai 200240 , China

Abstract

ABSTRACT The China Space Station Telescope (CSST) is a forthcoming Stage IV galaxy survey. It will simultaneously undertake the photometric redshift (photo-z) and slitless spectroscopic redshift (spec-z) surveys mainly for weak lensing and galaxy clustering studies. The two surveys cover the same sky area and overlap on the redshift range. At z > 1, due to the sparse number density of the spec-z sample, it limits the constraints on the scale of baryon acoustic oscillations (BAO). By cross-correlating the spec-z sample with the high density photo-z sample, we can effectively enhance the constraints on the angular diameter distances DA(z) from the BAO measurement. Based on the Fisher matrix, we forecast a >30 per cent improvement on constraining DA(z) from the joint analysis of the spec-z and cross galaxy power spectra at 1.0 < z < 1.2. Such improvement is generally robust against different systematic effects including the systematic noise and the redshift success rate of the spec-z survey, as well as the photo-z error. We also show the BAO constraints from other Stage-IV spectroscopic surveys for the comparison with CSST. Our study can be a reference for the future BAO analysis on real CSST data. The methodology can be applied to other surveys with spec-z and photo-z data in the same survey volume.

Funder

National Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Investigating early dark energy with new observations;Astroparticle Physics;2024-11

2. Forecasting the BAO measurements of the CSST galaxy and AGN spectroscopic surveys;Monthly Notices of the Royal Astronomical Society;2024-05-31

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