AN ESTIMATE OF THE PRIMORDIAL NON-GAUSSIANITY PARAMETER fNL USING THE NEEDLET BISPECTRUM FROM WMAP
AN ESTIMATE OF THE PRIMORDIAL NON-GAUSSIANITY PARAMETER fNL USING THE NEEDLET BISPECTRUM FROM WMAP
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运用WMAP针状双谱估计原初非高斯参数fNL
DOI：
10.1088/0004-637x/701/1/369
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. Matarrese
中科院分区：
文献类型：
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作者：
O. Rudjord;F. Hansen;Xiaohong Lan;M. Liguori;D. Marinucci;S. Matarrese
我们使用全双谱的球形针状应用到宇宙微波背景的WMAP数据作为原始的非高斯参数fNL的估计。我们使用最大为1000的针状尺度和KQ75银河系切割，发现fNL = 84 ± 40，经点源偏差校正。我们还引入了一组一致性测试来验证我们的结果对前景残差或系统误差的可能影响。特别是，从不同的频率通道，不同的掩模，和不同的多极子的fNL值的波动进行测试，对模拟地图。发现fNL估计值的所有变化在统计学上与模拟一致。
We use the full bispectrum of spherical needlets applied to the WMAP data of the cosmic microwave background as an estimator for the primordial non-Gaussianity parameter fNL. We use needlet scales up to ℓmax = 1000 and the KQ75 galactic cut and find fNL = 84 ± 40 corrected for point-source bias. We also introduce a set of consistency tests to validate our results against the possible influence of foreground residuals or systematic errors. In particular, fluctuations in the value of fNL obtained from different frequency channels, different masks, and different multipoles are tested against simulated maps. All variations in fNL estimates are found statistically consistent with simulations.