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A lower limit of Δz > 0.06 for the duration of the reionization epoch

Author

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  • Judd D. Bowman

    (Arizona State University, School of Earth and Space Exploration)

  • Alan E. E. Rogers

    (Massachusetts Institute of Technology, Haystack Observatory)

Abstract

A new look at the reionization of the Universe A new generation of radio telescopes is making it possible to observe the redshifted 21-centimetre spectral line of neutral hydrogen from the early Universe, providing a window onto the period when the gas between the galaxies was reionized. If reionization was an abrupt process, there should be a characteristic signature visible against the smooth foreground in an all-sky spectrum. Judd Bowman and Alan Rogers used the EDGES broadband spectrometer with a simple dipole antenna at the Murchison Radio-astronomy Observatory site in Western Australia to obtain an all-sky average spectrum between 100 and 200 megahertz. By subtracting a model of interfering Galactic and terrestrial sources, they recovered the 21-cm signal and place constraints on the reionization history, ruling out the most rapid possible transitions.

Suggested Citation

  • Judd D. Bowman & Alan E. E. Rogers, 2010. "A lower limit of Δz > 0.06 for the duration of the reionization epoch," Nature, Nature, vol. 468(7325), pages 796-798, December.
    • Handle: RePEc:nat:nature:v:468:y:2010:i:7325:d:10.1038_nature09601
    DOI: 10.1038/nature09601
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