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arXiv 1012.4788astro-ph.CO
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根据2008年South Pole望远镜完整数据对宇宙微波背景次级各向异性的改进约束

Improved constraints on cosmic microwave background secondary anisotropies from the complete 2008 South Pole Telescope data

E. Shirokoff, C. L. Reichardt, L. Shaw, M. Millea, P. A. R. Ade, K. A. Aird, B. A. Benson, L. E. Bleem, J. E. Carlstrom, C. L. Chang, H. M. Cho, T. M. Crawford,… 展开作者

E. Shirokoff, C. L. Reichardt, L. Shaw, M. Millea, P. A. R. Ade, K. A. Aird, B. A. Benson, L. E. Bleem, J. E. Carlstrom, C. L. Chang, H. M. Cho, T. M. Crawford, A. T. Crites, T. de Haan, M. A. Dobbs, J. Dudley, E. M. George, N. W. Halverson, G. P. Holder, W. L. Holzapfel, J. D. Hrubes, M. Joy, R. Keisler, L. Knox, A. T. Lee, E. M. Leitch, M. Lueker, D. Luong-Van, J. J. McMahon, J. Mehl, S. S. Meyer, J. J. Mohr, T. E. Montroy, S. Padin, T. Plagge, C. Pryke, J. E. Ruhl, K. K. Schaffer, H. G. Spieler, Z. Staniszewski, A. A. Stark, K. Story, K. Vanderlinde, J. D. Vieira, R. Williamson, O. Zahn

摘要:

我们报告的宇宙微波背景(CMB)功率谱的完整的2008年南极望远镜(SPT)数据集的测量。我们分析两倍的数据,第一个SPT功率谱分析,使用改进的宇宙学参数估计,适合多频模型的SPT 150和$220\,$ GHz的频带功率。我们发现一个很好的拟合测量的带功率与模型,包括透镜的主要CMB各向异性,二次热(tSZ)和动力学(kSZ)Sunyaev Zel 'dovich各向异性,非集群同步点源,和集群尘埃点源。除了测量尘埃星系在高信噪比的功率谱,数据主要限制在$150\,$ GHz和$\ell=3000$:$D^{tSZ}_{3000} + 0.5\,D^{kSZ}_{3000} = 4.5\pm 1.0 \,μ{\rm K}^2$的kSZ和tSZ各向异性贡献的线性组合。次级各向异性功效的95%置信上限为$D^{tSZ}_{3000} < 5.3\,μ{\rm K}^2$和$D^{kSZ}_{3000} < 6.5\,μ{\rm K}^2$。我们还考虑了尘埃和tSZ源的潜在相关性,并发现它无法放宽tSZ上限。这些结果增加了先前从SPT功率谱测量确定的低于预期的tSZ幅度的显著性。我们发现,模型,包括非热的压力支持组和集群预测tSZ功率与SPT数据更好地吻合。将tSZ功率测量与原始CMB数据相结合,可将$σ_8$的统计不确定性减半。然而,$σ_8$的首选值在tSZ模型之间存在显著差异。改进的宇宙学参数的约束条件,从tSZ功率谱测量需要继续在建模的tSZ功率的进展。

英文摘要:

We report measurements of the cosmic microwave background (CMB) power spectrum from the complete 2008 South Pole Telescope (SPT) data set. We analyze twice as much data as the first SPT power spectrum analysis, using an improved cosmological parameter estimator which fits multi-frequency models to the SPT 150 and $220\,$GHz bandpowers. We find an excellent fit to the measured bandpowers with a model that includes lensed primary CMB anisotropy, secondary thermal (tSZ) and kinetic (kSZ) Sunyaev-Zel'dovich anisotropies, unclustered synchrotron point sources, and clustered dusty point sources. In addition to measuring the power spectrum of dusty galaxies at high signal-to-noise, the data primarily constrain a linear combination of the kSZ and tSZ anisotropy contributions at $150\,$GHz and $\ell=3000$: $D^{tSZ}_{3000} + 0.5\,D^{kSZ}_{3000} = 4.5\pm 1.0 \,μ{\rm K}^2$. The 95% confidence upper limits on secondary anisotropy power are $D^{tSZ}_{3000} < 5.3\,μ{\rm K}^2$ and $D^{kSZ}_{3000} < 6.5\,μ{\rm K}^2$. We also consider the potential correlation of dusty and tSZ sources, and find it incapable of relaxing the tSZ upper limit. These results increase the significance of the lower than expected tSZ amplitude previously determined from SPT power spectrum measurements. We find that models including non-thermal pressure support in groups and clusters predict tSZ power in better agreement with the SPT data. Combining the tSZ power measurement with primary CMB data halves the statistical uncertainty on $σ_8$. However, the preferred value of $σ_8$ varies significantly between tSZ models. Improved constraints on cosmological parameters from tSZ power spectrum measurements require continued progress in the modeling of the tSZ power.

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