The cross-correlation of redshited 21-cm signal and Lyman-α forest: A cosmological probe

7th International Conference on Gravitation and Cosmology

Sarkar, T Guha^1 ; Bharadwaj, S.^2

Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad 211019, India^1

Department of Physics and Meteorology, IIT, Kharagpur 721302, India^2

关键词: Acoustic oscillation;    Auto-correlation signals;    Cosmological probes;    Cross correlations;    Large scale structures;    Red-shifted;    Reionization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/484/1/012033/pdf
DOI  :  10.1088/1742-6596/484/1/012033

来源: IOP

【 摘 要 】

We have investigated the cross-correlation of the Lyman-α forest and redshifted 21-cm emission as a new observational probe of the large scale structures in the post-reionization era, with a significant advantage that the problems of continuum subtraction and foreground removal, and other systematics are expected to be considerably less servere in comparison to the respective auto-correlation signals. In this paper, we have explored the possibility of detecting the baryon acoustic oscillation in the cross-correlation signal. We have developed a formalism to calculate the expected cross-correlation signal and its covariance. We have used this to predict the expected signal and noise for a range of observational parameters.