Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720308c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #203.08; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Hydrogen is the most abundant element in the Universe; in its neutral form, the ground state spin-flip 21-cm transition is in principle observable up to very high redshift, z 150, probing a vast volume of the structure in the Universe. Recently, the 21-cm emission has been proposed as a great tool to measure large-scale structure in the "intensity mapping" regime. Specifically, at redshifts around unity, 21-cm intensity mapping can be used to measure the Baryon Acoustic Oscillation (BAO) and thus infer properties of dark energy. I will show recent results of 21-cm cross-correlation measurements at redshift of 0.8, a first step towards such a goal, and the potential of a BAO hydrogen survey that may be achievable with the Allen Telescope Array.
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