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PAPER-64 CONSTRAINTS ON REIONIZATION: THE 21 cm POWER SPECTRUM AT z = 8.4.

Authors :
Zaki S. Ali
Aaron R. Parsons
Haoxuan Zheng
Jonathan C. Pober
Adrian Liu
James E. Aguirre
Richard F. Bradley
Gianni Bernardi
Chris L. Carilli
Carina Cheng
David R. DeBoer
Matthew R. Dexter
Jasper Grobbelaar
Jasper Horrell
Daniel C. Jacobs
Pat Klima
David H. E. MacMahon
Matthys Maree
David F. Moore
Nima Razavi
Source :
Astrophysical Journal; 8/10/2015, Vol. 809 Issue 1, p1-1, 1p
Publication Year :
2015

Abstract

In this paper, we report new limits on 21 cm emission from cosmic reionization based on a 135 day observing campaign with a 64-element deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization in South Africa. This work extends the work presented in Parsons et al. with more collecting area, a longer observing period, improved redundancy-based calibration, improved fringe-rate filtering, and updated power-spectral analysis using optimal quadratic estimators. The result is a new 2σ upper limit on Δ<superscript>2</superscript>(k) of (22.4 mK)<superscript>2</superscript> in the range at z = 8.4. This represents a three-fold improvement over the previous best upper limit. As we discuss in more depth in a forthcoming paper, this upper limit supports and extends previous evidence against extremely cold reionization scenarios. We conclude with a discussion of implications for future 21 cm reionization experiments, including the newly funded Hydrogen Epoch of Reionization Array. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0004637X
Volume :
809
Issue :
1
Database :
Complementary Index
Journal :
Astrophysical Journal
Publication Type :
Academic Journal
Accession number :
108890934
Full Text :
https://doi.org/10.1088/0004-637X/809/1/61