2013

New Limits on 21cm EoR From PAPER-32 Consistent with an X-Ray Heated IGM at z=7.7

Parsons, Aaron R., Liu, Adrian, Aguirre, James E. et al.

Understand

We present new constraints on the 21cm Epoch of Reionization (EoR) power spectrum derived from 3 months of observing with a 32-antenna, dual-polarization deployment of the Donald C.

Backer Precision Array for Probing the Epoch of Reionization (PAPER) in South Africa.
In this paper, we demonstrate the efficacy of the delay-spectrum approach to avoiding foregrounds, achieving over 8 orders of magnitude of foreground suppression (in $\textrm{mK}^2$).
Combining this approach with a procedure for removing off-diagonal covariances arising from instrumental systematics, we achieve a best 2-sigma upper limit of $(41\,\textrm{mK})^2$ for $k=0.27 h\textrm{Mpc}^{-1}$ at $z=7.7$.

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