Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 433, Issue 1, Pages 639-647Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt753
Keywords
intergalactic medium; cosmology: observations; diffuse radiation; radio lines: general
Categories
Funding
- Canada Foundation for Innovation
- Ontario Innovation Trust
- Ontario Research Fund
- Natural Science and Engineering Research Council of Canada
- NSF [AST-1009615]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009615] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1211777] Funding Source: National Science Foundation
Ask authors/readers for more resources
The Giant Metrewave Radio Telescope Epoch of Reionization experiment is an ongoing effort to measure the power spectrum from neutral hydrogen at high redshift. We have previously reported an upper limit of (70 mK)(2) at wavenumbers of k approximate to 0.65 h Mpc(-1) using a basic piecewise-linear foreground subtraction. In this paper, we explore the use of a singular value decomposition to remove foregrounds with fewer assumptions about the foreground structure. Using this method, we also quantify, for the first time, the signal loss due to the foreground filter and present new power spectra adjusted for this loss, providing a revised measurement of a 2 Sigma upper limit at (248 mK)(2) for k = 0.50 h Mpc(-1). While this revised limit is larger than previously reported, we believe it to be more robust and still represents the best current constraint on reionization at z approximate to 8.6.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available