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

Nature
Tzu-Ching ChangJeffrey B Peterson

Abstract

Observations of 21-cm radio emission by neutral hydrogen at redshifts z approximately 0.5 to approximately 2.5 are expected to provide a sensitive probe of cosmic dark energy. This is particularly true around the onset of acceleration at z approximately 1, where traditional optical cosmology becomes very difficult because of the infrared opacity of the atmosphere. Hitherto, 21-cm emission has been detected only to z = 0.24. More distant galaxies generally are too faint for individual detections but it is possible to measure the aggregate emission from many unresolved galaxies in the 'cosmic web'. Here we report a three-dimensional 21-cm intensity field at z = 0.53 to 1.12. We then co-add neutral-hydrogen (H i) emission from the volumes surrounding about 10,000 galaxies (from the DEEP2 optical galaxy redshift survey). We detect the aggregate 21-cm glow at a significance of approximately 4sigma.

References

Mar 21, 2008·Physical Review Letters·Tzu-Ching ChangPatrick McDonald

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Citations

Dec 4, 2015·Nature·Kiyoshi MasuiJaswant K Yadav
Jul 24, 2010·Nature·Chris L Carilli
Jul 26, 2012·Reports on Progress in Physics·Jonathan R Pritchard, Abraham Loeb

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