多频BOOMERanG观测的次Sunyaev-Zel'dovich信号
Subdegree Sunyaev-Zel'dovich Signal from Multifrequency BOOMERanG observations
摘要：
Sunyaev-Zel'dovich（SZ）效应是宇宙中的热电子对宇宙微波背景（CMB）光子的逆康普顿散射。该效应具有独特的光谱特征，允许其与多频率CMB数据集中的其他信号分离。使用CMB的各向异性测量在三个频率的BOOMERanG 2003年的飞行，我们限制SZ波动在10弧分至1度的角度范围。通过模拟消除误差和潜在的系统效应，我们得到了一个整体上限为15.3 uK（2西格玛）的均方根SZ波动在一个广泛的bin之间的多极250和1200的瑞利-金斯（RJ）结束的频谱。当与其他CMB各向异性和SZ测量相结合时，我们发现密度扰动的局部宇宙归一化在95%置信水平下为σ-8（SZ）< 0.96，与从原始扰动确定的σ-8一致。
英文摘要：
The Sunyaev-Zel'dovich (SZ) effect is the inverse Compton-scattering of cosmic microwave background (CMB) photons by hot electrons in the intervening gas throughout the universe. The effect has a distinct spectral signature that allows its separation from other signals in multifrequency CMB datasets. Using CMB anisotropies measured at three frequencies by the BOOMERanG 2003 flight we constrain SZ fluctuations in the 10 arcmin to 1 deg angular range. Propagating errors and potential systematic effects through simulations, we obtain an overall upper limit of 15.3 uK (2 sigma) for rms SZ fluctuations in a broad bin between multipoles of of 250 and 1200 at the Rayleigh-Jeans (RJ) end of the spectrum. When combined with other CMB anisotropy and SZ measurements, we find that the local universe normalization of the density perturbations is sigma-8(SZ) < 0.96 at the 95% confidence level, consistent with sigma-8 determined from primordial perturbations.
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