Line-of-Sight Anisotropies in the Cosmic Dawn and Epoch of Reionization 21-cm Power Spectrum

Journal of astrophysics and astronomy

Raghunath Ghara¹  Rajesh Mondal³  Kanan K. Datta²  Sk. Saiyad Ali⁵  T. Roy Choudhury¹  Suman Majumdar1⁴  Abhirup Datta⁶  Somnath Bharadwaj³ 

[1] National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Post Bag 3, Ganeshkhind, Pune 411007, India.$$;Department of Physics, Presidency University, 86/1 College Street, Kolkata 700 073, India.$$;Department of Physics & Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India.$$;Department of Physics, Blackett Laboratory, Imperial College, London SW7 2AZ, UK.$$;Department of Physics, Jadavpur University, Kolkata 700 032, India.$$;Centre for Astronomy, Indian Institute of Technology Indore, Indore 452 020, India.$$

关键词: Methods: statistical;    cosmology: theory;    dark ages;    reionization;    first stars;    diffuse radiation.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The line-of-sight direction in the redshifted 21-cm signal coming from the cosmic dawn and the epoch of reionization is quite unique in many ways compared to any other cosmological signal. Different unique effects, such as the evolution history of the signal, non-linear peculiar velocities of the matter etc. will imprint their signature along the line-of-sight axis of the observed signal. One of the major goals of the future SKA-LOW radio interferometer is to observe the cosmic dawn and the epoch of reionization through this 21-cm signal. It is thus important to understand how these various effects affect the signal for its actual detection and proper interpretation. For more than one and half decades, various groups in India have been actively trying to understand and quantify the different line-of-sight effects that are present in this signal through analytical models and simulations. In many ways the importance of this sub-field under 21-cm cosmology have been identified, highlighted and pushed forward by the Indian community. In this article, we briefly describe their contribution and implication of these effects in the context of the future surveys of the cosmic dawn and the epoch of reionization that will be conducted by the SKA-LOW.

【 授权许可】

Unknown