期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 423, 期 3, 页码 2518-2532出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2012.21065.x
关键词
methods: statistical; cosmology: theory; dark ages, reionization, first stars; diffuse radiation
资金
- Royal Society via a University Research Fellowship
- NASA Lunar Science Institute [NNA09DB30A]
- Science and Technology Facilities Council [ST/J001511/1, ST/I000879/1] Funding Source: researchfish
- STFC [ST/I000879/1, ST/J001511/1] Funding Source: UKRI
We introduce a new implementation of the fastica algorithm on simulated Low Frequency Array Epoch of Reionization data with the aim of accurately removing the foregrounds and extracting the 21-cm reionization signal. We find that the method successfully removes the foregrounds with an average fitting error of 0.5 per cent and that the 2D and 3D power spectra are recovered across the frequency range. We find that for scales above several point spread function scales, the 21-cm variance is successfully recovered though there is evidence of noise leakage into the reconstructed foreground components. We find that this blind independent component analysis technique provides encouraging results without the danger of prior foreground assumptions.
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