Abstract
The importance of searches for high redshift H I should be obvious to anyone attending this conference. This topic appears several times on the program, and there may well be some duplication there (see contributions by Chengalur, Carilli, Swarup and Braun). Most radio searches for cosmological H I, whether in emission or absorption, have thusfar been conducted around a frequency of 327 MHz. At that frequency we are tuned to the 21cm line at a redshift of about 3.4. There is nothing magic about this frequency except that the deuterium line is at a frequency of 327.4 MHz and many observatories in the past built receivers to try and detect it. Because of this the band around this line has received protection and is relatively free of interference.
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de Bruyn, A.G. (1996). HI at High Redshift. In: Bremer, M.N., van der Werf, P.P., Röttgering, H.J.A., Carilli, C.L. (eds) Cold Gas at High Redshift. Astrophysics and Space Science Library, vol 206. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1726-2_17
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DOI: https://doi.org/10.1007/978-94-009-1726-2_17
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