Foreground influence on primordial non-Gaussianity estimates: needlet analysis of WMAP 5-year data
Foreground influence on primordial non-Gaussianity estimates: needlet analysis of WMAP 5-year data
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前景对原始非高斯估计的影响:WMAP 5 年数据的针刺分析
DOI:
10.1111/j.1365-2966.2010.16542.x
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发表时间:
2010
影响因子:
4.8
通讯作者:
Cabella P
中科院分区:
文献类型:
--
作者:
Cabella P
We constrain the amplitude of primordial non-Gaussianity in the cosmic microwave background data taking into account the presence of foreground residuals in the maps. We generalize the needlet bispectrum estimator marginalizing over the amplitudes of thermal dust, free–free and synchrotron templates. We apply our procedure toWilkinson Microwave Anisotropy Probe5-year data, findingfNL= 38 ± 47 (1σ), while the analysis without marginalization providesfNL= 35 ± 42. Splitting the marginalization over each foreground separately, we found that the estimates offNLare positively cross-correlated of 17 and 12 per cent with the dust and synchrotron, respectively, while a negative cross-correlation of about −10 per cent is found for the free–free component.
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DOI:
10.1088/0004-637x/701/1/369
发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
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作者:
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通讯作者:
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DOI:
10.1111/j.1365-2966.2009.14847.x
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2008
影响因子:
4.8
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2009
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作者:
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1998
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通讯作者:
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DOI:
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发表时间:
1999
期刊:
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作者:
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