Abstract
In this review article, we briefly outline our current understanding of the physics associated with the HI 21-cm signal from cosmic dawn. We discuss different phases of cosmic dawn as the ambient gas and the background radiations evolve with the redshift. We address the consequences of several possible heating sources and radiation background on the global 21-cm signal. We further review our present perspective of other important aspects of the HI 21-cm signal, such as power spectrum and imaging. Finally, we highlight the future key measurements of the Square Kilometre Array and other ongoing/upcoming experiments that will enlighten our understanding of the early Universe.
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Acknowledgements
AB acknowledges financial support from UGC, Government of India. SS and KKD acknowledge financial support from BRNS through a project grant (sanction no: 57/14/10/2019-BRNS). SS thanks Presidency University for the support through FRPDF grant. RG acknowledges support by the Israel Science Foundation (grant no. 255/18). AC acknowledge support of the Department of Atomic Energy, Government of India, under project no. 12-R &D-TFR-5.02-0700. KKD also acknowledges financial support from SERB-DST (Government of India) through a project under MATRICS scheme (MTR/2021/000384).
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This article is part of the Special Issue on “Indian Participation in the SKA”.
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Bera, A., Ghara, R., Chatterjee, A. et al. Studying cosmic dawn using redshifted HI 21-cm signal: A brief review. J Astrophys Astron 44, 10 (2023). https://doi.org/10.1007/s12036-022-09904-w
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DOI: https://doi.org/10.1007/s12036-022-09904-w