Redshifted 21 cm Emission from the Pre-Reionization Era. H II Regions Around Individual Quasars

Details Redshifted 21 cm Emission from the Pre-Reionization Era. H II Regions Around Individual Quasars Redshifted 21 cm Emission from the Pre-Reionization Era. H II Regions Around Individual Quasars

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..345..304k&link_type=abstract

From Clark Lake to the Long Wavelength Array: Bill Erickson's Radio Science ASP Conference Series, Vol. 345, Proceedings of the

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We use cosmological simulations of reionization to predict the effect of large H II regions around individual high-redshift quasars on the possible signal from the redshifted 21 cm line of neutral hydrogen in the pre-reionization era. We show that these H II regions appear as ``spectral dips'' in frequency space with equivalent widths in excess of 3 mK MHz or depths in excess of about 1.5 mK, and that they are by far the most prominent cosmological signals in the redshifted HI distribution.
These spectral dips are expected to be present in almost every line of sight. If the spectral dips of a large enough sample of H II regions are well resolved in frequency space, the distribution of line depth and equivalent width in frequency with a known observing beamsize can be used to infer the H II region size distribution and the mean difference in neutral hydrogen density between the H II regions (which may contain self-shielded neutral gas clumps) and the surrounding medium, providing a powerful test for models of reionization.

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