Can the reionization epoch be detected as a global signature in the cosmic background?

P. A. Shaver, Rogier Windhorst, P. Madau, A. G. De Bruyn

Research output: Contribution to journalArticle

207 Citations (Scopus)

Abstract

The reionization of the Universe is expected to have left a signal in the form of a sharp step in the spectrum of the sky. If reionization took place at 5 ≲ zion ≲ 20, a feature should be present in the radio sky at 70 ≲ v ≲, 240 MHz due to redshifted HI 21-cm line emission, accompanied by another feature in the optical/near-IR at 0.7 ≲ λ ≲ 2.6 μm due to hydrogen recombination radiation. The expected amplitude is well above fundamental detection limits, and the sharpness of the feature may make it distinguishable from variations due to galactic and extragalactic foregrounds. Because this is essentially a continuum measurement of a signal which occurs over the whole sky, relatively small telescopes may suffice for detection in the radio. In the optical/near-IR, a space telescope is needed with the lowest possible background conditions, since the experiment will be severely background-limited.

Original languageEnglish (US)
Pages (from-to)380-390
Number of pages11
JournalAstronomy and Astrophysics
Volume345
Issue number2
StatePublished - 1999

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sky
time measurement
signatures
radio
telescopes
hydrogen recombinations
recombination
sharpness
hydrogen
universe
continuums
experiment
radiation
detection

Keywords

  • Cosmology: Cosmic microwave background
  • Cosmology: Diffuse radiation
  • Cosmology: Early Universe
  • Cosmology: Observations

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Can the reionization epoch be detected as a global signature in the cosmic background? / Shaver, P. A.; Windhorst, Rogier; Madau, P.; De Bruyn, A. G.

In: Astronomy and Astrophysics, Vol. 345, No. 2, 1999, p. 380-390.

Research output: Contribution to journalArticle

Shaver, P. A. ; Windhorst, Rogier ; Madau, P. ; De Bruyn, A. G. / Can the reionization epoch be detected as a global signature in the cosmic background?. In: Astronomy and Astrophysics. 1999 ; Vol. 345, No. 2. pp. 380-390.
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