TL;DR
This review summarizes the development of extragalactic HI astronomy over 50 years, highlighting its contributions to understanding dark matter, cosmological parameters, and large-scale structure, with a focus on recent Arecibo observations.
Contribution
It provides a concise overview of HI cosmology at low redshift, emphasizing recent advancements and the role of Arecibo in large-scale HI mapping.
Findings
HI observations revealed dark matter in galaxies.
Large-scale HI surveys map the low z Universe.
Arecibo's experiments enhance understanding of cosmic structure.
Abstract
Extragalactic HI astronomy is half a century old. Its maturity dramatically increased in the 1970s, with the commissioning of new powerful facilities. Its contributions to Cosmology are important, from the observation of galaxy rotation curves that showed the presence of dark matter in galaxies, to the measurement of cosmological parameters and the mapping of the large scale structure of the Universe. The Arecibo telecope has played a key role in these developments. It is also currently engaged in a number of experiments that utilize its L-band feed array to map thousands of square degrees of the sky and obtain the most sensitive large-scale view of the low z HI Universe.
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