|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
19 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
New Limits on Polarized Power Spectra at 126 and 164 MHz: Relevance to Epoch of Reionization Measurements | | 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
; William Walbrugh
; | | Date: |
17 Feb 2015 | | Abstract: | 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 $sim2 imes10^{-3}$, roughly an order of
magnitude lower than that observed for point sources at 1.4 GHz. | | Source: | arXiv, 1502.5072 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER