Redshifted HI 21-cm Signal from the Post-Reionization Epoch: Cross-Correlations with Other Cosmological Probes

Journal of astrophysics and astronomy

A. K. Pal²  T. Guha Sarkar1²  S. Bharadwaj⁴  K. K. Datta¹  T. Roy Choudhury³ 

[1] Department of Physics, Presidency University, Kolkata, 700 073, India.$$;Department of Physics, Birla Institute of Technology and Science, Pilani 333 031, India.$$;National Centre for Radio Astrophysics, Pune, 411 007, India.$$;Department of Physics, Indian Institute of Technology, Kharagpur, 721 302, India.$$

关键词: Cosmology: theory;    large-scale structure of Universe;    cosmology: diffuse radiation;    cosmology: dark energy.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Tomographic intensity mapping of the HI using the redshifted 21-cm observations opens up a new window towards our understanding of cosmological background evolution and structure formation. This is a key science goal of several upcoming radio telescopes including the Square Kilometer Array (SKA). In this article, we focus on the post-reionization signal and investigate the cross correlating of the 21-cm signal with other tracers of the large scale structure. We consider the cross-correlation of the post-reionization 21-cm signal with the Lyman- α forest, Lyman-break galaxies and late time anisotropies in the CMBR maps like weak lensing and the integrated Sachs Wolfe effect. We study the feasibility of detecting the signal and explore the possibility of obtaining constraints on cosmological models using it.

【 授权许可】

Unknown