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

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

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010natur.466..463c&link_type=abstract

Nature, Volume 466, Issue 7305, pp. 463-465 (2010).

Physics

22

Scientific paper

Observations of 21-cm radio emission by neutral hydrogen at redshifts z~0.5 to ~2.5 are expected to provide a sensitive probe of cosmic dark energy. This is particularly true around the onset of acceleration at z~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 (HI) 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 ~4σ.

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