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Observational limits on neutral hydrogen in primordial protoclusters

Published online by Cambridge University Press:  07 February 2017

R. D. Davies
R. D. Davies*
Affiliation:
University of Manchester Nuffield Radio Astronomy Laboratories Jodrell Bank Macclesfield Cheshire, SK11 9DL

Extract

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After recombination in the early Universe, gas will pass through a neutral phase on its way to condensation into galaxies and stars. Radio emission in the reshifted 21 cm line of neutral hydrogen can be used to detect condensations in the early Universe. Sunyaev and Zeldovich (1972, 1975) have suggested that primordial protoclusters may be predominantly neutral at z = 3 to 10 and may have neutral hydrogen masses ~ 1014 M⊙. Two observational approaches have been made to the search for this emission.

Type
V. The Formation of Structure in the Universe
Information
Symposium - International Astronomical Union , Volume 79: The Large Scale Structure of the Universe , 1978 , pp. 447 - 448
Copyright
Copyright © Reidel 1978 

References

Davies, R.D., Booth, R.S. and Pedlar, A., 1977. Mon. Not. R. astr. Soc., in press.Google Scholar
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Sunyaev, R.A. and Zeldovich, Ya. B., 1972. Astr. Astrophys., 20, 189; 1975. Mon. Not. R. astr. Soc., 171, 375.Google Scholar