Probing galaxy evolution through HI 21-cm emission and absorption: current status and prospects with the Square Kilometre Array
Abstract
One of the major science goals of the Square Kilometre Array (SKA) is to understand the role played by atomic hydrogen (HI) gas in the evolution of galaxies throughout cosmic time. The hyperfine transition line of the hydrogen atom at 21-cm is one of the best tools to detect and study the properties of HI gas associated with galaxies. In this article, we review our current understanding of HI gas and its relationship with galaxies through observations of the 21-cm line both in emission and absorption. In addition, we provide an overview of the HI science that will be possible with SKA and its pre-cursors and pathfinders, i.e. HI 21-cm emission and absorption studies of galaxies from nearby to high redshifts that will trace various processes governing galaxy evolution.
Cite
@article{arxiv.2209.09264,
title = {Probing galaxy evolution through HI 21-cm emission and absorption: current status and prospects with the Square Kilometre Array},
author = {Rajeshwari Dutta and Sushma Kurapati and J. N. H. S. Aditya and Omkar Bait and Mousumi Das and Prasun Dutta and K. Indulekha and Meera Nandakumar and Narendra Nath Patra and Nirupam Roy and Sambit Roychowdhury},
journal= {arXiv preprint arXiv:2209.09264},
year = {2022}
}
Comments
31 pages, 7 figures, accepted on 27 May 2022 for publication in the Journal of Astrophysics and Astronomy (to appear in the special issue on "Indian participation in the SKA"), figure 4 has been updated