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

  • Suman MajumdarEmail author
  • Kanan K. Datta
  • Raghunath Ghara
  • Rajesh Mondal
  • T. Roy Choudhury
  • Somnath Bharadwaj
  • Sk. Saiyad Ali
  • Abhirup Datta
Review

Abstract

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.

Keywords

Methods: statistical—cosmology: theory—dark ages, reionization, first stars—diffuse radiation. 

Notes

Acknowledgements

The first author (SM) would like to acknowledge financial support from the European Research Council under the ERC grant number 638743-FIRSTDAWN and from the European Unions Seventh Framework Programme FP7-PEOPLE-2012-CIG, Grant No. 321933-21ALPHA. The second author (KKD) would like to thank University Grants Commission (UGC), India for support through UGC-Faculty Recharge Scheme (UGC-FRP) vide ref. no. F.4-5(137-FRP)/2014(BSR).

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Copyright information

© Indian Academy of Sciences 2016

Authors and Affiliations

  1. 1.Department of Physics, Blackett LaboratoryImperial CollegeLondonUK
  2. 2.Department of PhysicsPresidency UniversityKolkataIndia
  3. 3.National Centre for Radio AstrophysicsTata Institute of Fundamental ResearchPuneIndia
  4. 4.Department of Physics & Centre for Theoretical StudiesIndian Institute of Technology KharagpurKharagpurIndia
  5. 5.Department of PhysicsJadavpur UniversityKolkataIndia
  6. 6.Centre for AstronomyIndian Institute of Technology IndoreIndoreIndia

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