Cross-correlation Forecast of CSST Spectroscopic Galaxy and MeerKAT Neutral Hydrogen Intensity Mapping Surveys

Cross-correlating the data on neutral hydrogen (H i ) 21 cm intensity mapping with galaxy surveys is an effective method to extract astrophysical and cosmological information. In this work, we investigate the cross-correlation of MeerKAT single-dish mode H i intensity mapping and China Space Station...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2023-07, Vol.23 (7), p.75003-36
Main Authors: Jiang, Yu-Er, Gong, Yan, Zhang, Meng, Xiong, Qi, Zhou, Xingchen, Deng, Furen, Chen, Xuelei, Ma, Yin-Zhe, Yue, Bin
Format: Article
Language:English
Subjects:
(cosmology:) cosmological parameters
(cosmology:) large-scale structure of universe
Accuracy
Algorithms
Correlation
Cosmology
Cross correlation
Galactic evolution
Galaxies
Hydrogen
Mapping
Polls & surveys
Power spectra
Space stations
Spectroscopy
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Summary:Cross-correlating the data on neutral hydrogen (H i ) 21 cm intensity mapping with galaxy surveys is an effective method to extract astrophysical and cosmological information. In this work, we investigate the cross-correlation of MeerKAT single-dish mode H i intensity mapping and China Space Station Telescope (CSST) spectroscopic galaxy surveys. We simulate a survey area of ∼300 deg 2 of MeerKAT and CSST surveys at z = 0.5 using Multi-Dark N -body simulation. The PCA algorithm is applied to remove the foregrounds of H i intensity mapping, and signal compensation is considered to solve the signal loss problem in H i -galaxy cross power spectrum caused by the foreground removal process. We find that from CSST galaxy auto and MeerKAT-CSST cross power spectra, the constraint accuracy of the parameter product Ω H I b H I r H I, g can reach ∼1%, which is about one order of magnitude higher than the current results. After performing the full MeerKAT H i intensity mapping survey with 5000 deg 2 survey area, the accuracy can be enhanced to
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/accdc0