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arXiv 1208.2625astro-ph.CO
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用WMAP和South Pole望远镜数据对原始磁场随机背景的约束

Constraints on a Stochastic Background of Primordial Magnetic Fields with WMAP and South Pole Telescope data

Daniela Paoletti, Fabio Finelli

摘要:

利用WMAP 7年观测数据和南极望远镜(SPT)观测数据,通过原始磁场(PMF)对宇宙微波背景(CMB)各向异性角功率谱的贡献,约束了PMF的随机背景.污染的SPT数据的未解决的点源和Sunyaev Zeldovich(SZ)的影响,由于星系团已被考虑作为模拟的SPT合作。与此相结合的WMAP 7年和SPT数据,我们约束的振幅高斯平滑超过1兆秒差距的随机背景的非螺旋PMF $B_{\rm 1 Mpc}<3.5$ nG在95%的置信水平。我们的分析表明,SPT数据高达$\ell=3000$带来的改善几乎是一个因素2与以前的CMB高$\ell$数据的结果。然后,我们讨论了预测的影响,从未解决的点源和SZ效应{ \sc普朗克}的能力,在约束PMF。

英文摘要:

We constrain a stochastic background of primordial magnetic fields (PMF) by its contribution to the cosmic microwave background (CMB) anisotropy angular power spectrum with the combination of WMAP 7 year and South Pole Telescope (SPT) data. The contamination in the SPT data by unresolved point sources and by the Sunyaev Zeldovich (SZ) effect due to galaxy clusters has been taken into account as modelled by the SPT collaboration. With this combination of WMAP 7 yr and SPT data, we constrain the amplitude Gaussian smoothed over 1 Mpc scale of a stochatic background of non-helical PMF to $B_{\rm 1 Mpc}<3.5$ nG at 95% confidence level. Our analysis shows that SPT data up to $\ell=3000$ bring an improvement of almost a factor two with respect to results with previous CMB high-$\ell$ data. We then discuss the forecasted impact from unresolved points sources and SZ effect for {\sc Planck} capabilities in constraining PMF.

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