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Date: Wed, 18 Feb 2015 20:16:09 -0500
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arXiv:1502.05072
From: James Aguirre<[email protected]>
Date: Tue, 17 Feb 2015 21:53:01 GMT (477kb)
Title: New Limits on Polarized Power Spectra at 126 and 164 MHz: Relevance to
Epoch of Reionization Measurements
Authors: David Moore, James E. Aguirre, Aaron Parsons, Zaki Ali, Richard
Bradley, Chris Carilli, David DeBoer, Matthew Dexter, Nicole Gugliucci,
Daniel Jacobs, Pat Klima, Adrian Liu, David MacMahon, Jason Manley, Jonathan
Pober, Irina Stefan, and William Walbrugh
Categories: astro-ph.CO astro-ph.IM
Comments: Submitted to ApJ
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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Polarized foreground emission is a potential contaminant of attempts to
measure the fluctuation power spectrum of highly redshifted 21 cm H{\sc i}
emission from the epoch of reionization, yet observational constraints on the
level of polarized emission are poor. Using the Donald C. Backer Precision
Array for Probing the Epoch of Reionization (PAPER), we present the first
limits on the power spectra of all four Stokes parameters in two frequency
bands, centered at 126 MHz ($z=10.3$) and 164 MHz ($z=7.66$). This data comes
from from a three-month observing campaign of a 32-antenna deployment, for
which unpolarized power spectrum results have been reported at $z=7.7$ (Parsons
et al 2014) and $7.5< z< 10.5$ (Jacobs et al 2014). The power spectra in this
paper are processed in the same way, and show no definitive detection of
polarized power. The limits are sufficiently low that we are able to show that
the excess unpolarized power reported in those works is not due to leakage of
Faraday-rotated polarized emission. Building upon the Moore et al 2013
simulations of polarized point sources, we further argue that our upper limits
and previous observations imply that the mean polarization fraction of point
sources at these frequencies is $\sim2\times10^{-3}$, roughly an order of
magnitude lower than that observed for point sources at 1.4 GHz.
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Contains:
CompareSim.eps: 144870 bytes
CompareSim_MLE.eps: 144888 bytes
NgtP.eps: 64578 bytes
PQ_vs_t.eps: 1409300 bytes
Pspec_2x2_110_149.eps: 139244 bytes
Pspec_2x2_37_70.eps: 136765 bytes
Tsys_all.eps: 1533706 bytes
Tsys_lst.eps: 131080 bytes
apj_w_etal.bst: 30706 bytes
emulateapj.cls: 62658 bytes
ms.bbl: 8206 bytes
ms.tex: 50303 bytes
pmn_simulation.eps: 754552 bytes
