The End of the Beginning: The Dawn of 21 cm Cosmology With EDGES

Details The End of the Beginning: The Dawn of 21 cm Cosmology With EDGES The End of the Beginning: The Dawn of 21 cm Cosmology With EDGES

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532501b&link_type=abstract

American Astronomical Society, AAS Meeting #215, #325.01; Bulletin of the American Astronomical Society, Vol. 42, p.421

Astronomy and Astrophysics

Astronomy

Scientific paper

For the first time, observations targeting the highly redshifted 21 cm line have yielded a meaningful probe of neutral hydrogen in the intergalactic medium during the epoch of reionization. The Experiment to Detect the Global Epoch of Reionization Signature (EDGES) has measured the all-sky radio spectrum between 100 and 200 MHz with 10 mK sensitivity. This is a factor of three below the maximum redshifted 21 cm contribution predicted for a fully neutral intergalactic medium above redshift 6. Preliminary analysis of these measurements has begun to rule out very rapid reionization histories between redshifts 6 and 10. The ability to detect reionization histories with long time scales is currently limited by the subtraction of a low-order polynomial to remove systematics that change slowly with frequency. The latest results will be presented.

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