Mathematics – Logic
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.8901h&link_type=abstract
American Astronomical Society, AAS Meeting #212, #89.01; Bulletin of the American Astronomical Society, Vol. 40, p.268
Mathematics
Logic
Scientific paper
Observations of the redshifted 21cm line of neutral hydrogen have the potential to probe the processes of structure formation and reionization in a unique way, complementing other techniques in cosmology. In principle, a very large volume of the universe could be probed with this technique. However, the high redshift means that observations have to be done at frequencies of 200 MHz and below, a part of the spectrum plagued by radio frequency interference. Observations are also made challenging by the very bright foregrounds and by corruption of interferometric phases by the ionosphere. I will review the status of the first-generation experiments that currently are under construction. Even modest collecting areas should be capable of detecting the power spectrum of fluctuations and the largest "bubbles" around quasars. Second generation experiments could in principle map structures on a wide range of spatial scales and, through sensitive power spectrum measurements, serve as a new probe of cosmological models and of dark matter.
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