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Extragalactic HI surveys

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Abstract

We review the results of HI line surveys of extragalactic sources in the local Universe. In the last two decades major efforts have been made in establishing on firm statistical grounds the properties of the HI source population, the two most prominent being the HI Parkes All Sky Survey and the Arecibo Legacy Fast ALFA survey. We review the choices of technical parameters in the design and optimization of spectro-photometric “blind” HI surveys, which for the first time produced extensive HI-selected data sets. Particular attention is given to the relationship between optical and HI populations, the differences in their clustering properties and the importance of HI-selected samples in contributing to the understanding of apparent conflicts between observation and theory on the abundance of low mass halos. The last section of this paper provides an overview of currently ongoing and planned surveys which will explore the cosmic evolution of properties of the HI population.

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Acknowledgments

We thank the entire ALFALFA survey team for their many contributions over the last decade (and more) towards observing, data processing and analysis that have led to a rich ALFALFA harvest. The ALFALFA survey team at Cornell has been supported by US NSF Grants AST-0607007 and AST-1107390 to RG and MPH and by continuing support from the Brinson Foundation.

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Correspondence to Riccardo Giovanelli.

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Giovanelli, R., Haynes, M.P. Extragalactic HI surveys. Astron Astrophys Rev 24, 1 (2016). https://doi.org/10.1007/s00159-015-0085-3

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  • DOI: https://doi.org/10.1007/s00159-015-0085-3

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