Lensing of 21cm Absorption "Halos" of 20-30 First Galaxies
arXiv:astro-ph/0608271 · doi:10.1111/j.1365-2966.2007.12090.x
Abstract
Extended 21cm absorption regions (dubbed ``21cm absorption halos'') around first galaxies at are likely the first distinctive structures accessible to radio observations. Though the radio array capable of detecting and resolving them must have km total collecting area, given the great impact of such detections to the understanding of the reionization process and cosmology, such radio survey would be extremely profitable. As an example, we point out a potentially useful byproduct of such survey. The resolved 21cm absorption ``halos'', likely close to spherical, can serve as (almost) ideal sources for measuring the {\it cosmic shear} and mapping the matter distribution to . We investigate the expected lensing signal and consider a variety of noise contributions on the shear measurement. We find that S/N can be achieved for individual ``halos''. Given millions of 21cm absorption ``halos'' across the sky, the total S/N will be comparable to traditional shear measurement of galaxies at .
arXiv commentMinor revisions and expanded discussions. Accepted to MNRAS
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