Galaxy-cluster masses via 21st-century measurements of lensing of 21-cm fluctuations

Ely D. Kovetz, Marc Kamionkowski

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Abstract

We discuss the prospects to measure galaxy-cluster properties via weak lensing of 21-cm fluctuations from the dark ages and the epoch of reionization (EOR). We choose as a figure of merit the smallest cluster mass detectable through such measurements. We construct the minimum-variance quadratic estimator for the cluster mass based on lensing of 21-cm fluctuations at multiple redshifts. We discuss the tradeoff among frequency bandwidth, angular resolution, and the number of redshift shells available for a fixed noise level for the radio detectors. Observations of lensing of the 21-cm background from the dark ages will be capable of detecting M 1012h-1M mass halos, but will require futuristic experiments to overcome the contaminating sources. Next-generation radio measurements of 21-cm fluctuations from the EOR will, however, have the sensitivity to detect galaxy clusters with halo masses M 1013h-1M, given enough observation time (for the relevant sky patch) and collecting area to maximize their resolution capabilities.

Original languageEnglish
Article number063516
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number6
DOIs
StatePublished - 14 Mar 2013
Externally publishedYes

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