An intensity map of hydrogen 21-cm emission at redshift z ≈ 0.8

Tzu-Ching Chang (), Ue-Li Pen, Kevin Bandura and Jeffrey B. Peterson
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Tzu-Ching Chang: IAA, Academia Sinica, PO Box 23-141, Taipei 10617, Taiwan
Ue-Li Pen: CITA, University of Toronto
Kevin Bandura: Carnegie Mellon University
Jeffrey B. Peterson: Carnegie Mellon University

Nature, 2010, vol. 466, issue 7305, 463-465

Abstract: A broad view of the cosmos To study the past effects of cosmic dark energy — the force hypothesized to explain the increasing rate of expansion of the Universe — astronomers need to know more about the structure at extreme cosmological distances. The 21-centimetre radio emission line by neutral hydrogen is seen as a potentially useful tool for the purpose. Until now, 21-cm emission has been detected in galaxies only to a redshift of z = 0.24. Beyond this point, galaxies are too faint to be detected individually, but it is possible to measure the aggregate emission from many unresolved sources in the 'cosmic web'. Using the Green Bank Telescope in West Virginia, Chang et al. have produced a three-dimensional intensity map of hydrogen 21-cm radiation at redshifts of 0.53 to 1.12. Adding the H I emissions from the volumes surrounding about 10,000 galaxies from the DEEP2 optical galaxy redshift survey to the data set provides a view of the aggregate 21-cm glow to a statistical significance of 4σ.

Date: 2010
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DOI: 10.1038/nature09187

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