IMPROVED CONSTRAINTS ON COSMIC MICROWAVE BACKGROUND SECONDARY ANISOTROPIES FROM THE COMPLETE 2008 SOUTH POLE TELESCOPE DATA
IMPROVED CONSTRAINTS ON COSMIC MICROWAVE BACKGROUND SECONDARY ANISOTROPIES FROM THE COMPLETE 2008 SOUTH POLE TELESCOPE DATA
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根据完整的 2008 年南极望远镜数据改进了对宇宙微波背景二次各向异性的约束
DOI：
10.1088/0004-637x/736/1/61
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
O. Zahn
中科院分区：
文献类型：
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作者：
E. Shirokoff;C. Reichardt;L. Shaw;M. Millea;P. Ade;K. Aird;B. Benson;B. Benson;L. Bleem;J. Carlstrom;C. Chang;Hsiao;T. Crawford;A. Crites;T. Haan;M. Dobbs;J. Dudley;E. George;N. Halverson;G. Holder;W. Holzapfel;J. Hrubeš;M. Joy;R. Keisler;L. Knox;Adrian T. Lee;Adrian T. Lee;E. Leitch;M. Lueker;D. Luong;J. McMahon;J. McMahon;J. Mehl;S. Meyer;J. Mohr;T. Montroy;S. Padin;S. Padin;T. Plagge;C. Pryke;J. Ruhl;K. Schaffer;K. Schaffer;H. Spieler;Z. Staniszewski;A. Stark;K. Story;K. Vanderlinde;J. Vieira;R. Williamson;O. Zahn
我们报告了从完整的2008年南极望远镜(SPT)数据集测量到的宇宙微波背景(CMB)功率谱。我们使用一种改进的宇宙学参数估计器来分析比第一次SPT功率谱分析多一倍的数据，该参数估计器将多频率模型匹配到SPT 150和220 GHz带宽功率。我们发现一个包括透镜初级CMB各向异性、次级热(TSZ)和动力学(KSZ)Sunyaev-Zel‘dovich各向异性、未聚集的同步加速器点源和聚集的尘埃点源的模型与测量的能带功率有很好的拟合。除了在高信噪比下测量尘埃星系的功率谱外，这些数据还主要限制了在150千兆赫和ℓ=3000时kSZ和TSZ各向异性贡献的线性组合：DtSZ3000+0.5 DkSZ3000=4.5±1.0 μK2。二次各向异性功率的95%置信度上限为DtSZ3000<；5.3 μK2和DkSZ3000&6.5 μK2。我们还考虑了尘源和TSZ源的潜在关联，发现它不能放宽TSZ的上限。这些结果增加了先前从SPT功率谱测量中确定的低于预期的TSZ幅度的重要性。我们发现，考虑基团和团簇中非热压支持的模型对TSZ功率的预测与SPT数据吻合得更好。将TSZ功率测量与CMB原始数据相结合，将σ8的统计不确定性减半。然而，不同TSZ模型的σ8的首选值有很大差异。通过TSZ功率谱测量改进对宇宙学参数的约束，需要在TSZ功率的建模方面继续取得进展。
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 ℓ = 3000: DtSZ3000 + 0.5 DkSZ3000 = 4.5 ± 1.0 μK2. The 95% confidence upper limits on secondary anisotropy power are DtSZ3000 < 5.3 μK2 and DkSZ3000 < 6.5 μK2. 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 σ8. However, the preferred value of σ8 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.
DOI：
10.1088/0004-637x/756/2/142
发表时间：
2012-02
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. V. Engelen;R. Keisler;O. Zahn;K. Aird;B. Benson;L. Bleem;J. Carlstrom;J. Carlstrom;C. Chang;C. Chang;Hsiao-mei Cho.;T. Crawford;A. Crites;T. Haan;M. Dobbs;J. Dudley;E. George;N. Halverson;G. Holder;W. Holzapfel;S. Hoover;Z. Hou;J. Hrubeš;M. Joy;L. Knox;Adrian T. Lee;Adrian T. Lee;E. Leitch;M. Lueker;D. Luong-Van;J. McMahon;J. Mehl;S. Meyer;M. Millea;J. Mohr;T. Montroy;T. Natoli;S. Padin;S. Padin;T. Plagge;C. Pryke;C. Reichardt;J. Ruhl;J. Sayre;K. Schaffer;K. Schaffer;L. Shaw;E. Shirokoff;H. Spieler;Z. Staniszewski;A. Stark;K. Story;K. Vanderlinde;J. Vieira;R. Williamson
通讯作者：
A. V. Engelen;R. Keisler;O. Zahn;K. Aird;B. Benson;L. Bleem;J. Carlstrom;J. Carlstrom;C. Chang;C. Chang;Hsiao-mei Cho.;T. Crawford;A. Crites;T. Haan;M. Dobbs;J. Dudley;E. George;N. Halverson;G. Holder;W. Holzapfel;S. Hoover;Z. Hou;J. Hrubeš;M. Joy;L. Knox;Adrian T. Lee;Adrian T. Lee;E. Leitch;M. Lueker;D. Luong-Van;J. McMahon;J. Mehl;S. Meyer;M. Millea;J. Mohr;T. Montroy;T. Natoli;S. Padin;S. Padin;T. Plagge;C. Pryke;C. Reichardt;J. Ruhl;J. Sayre;K. Schaffer;K. Schaffer;L. Shaw;E. Shirokoff;H. Spieler;Z. Staniszewski;A. Stark;K. Story;K. Vanderlinde;J. Vieira;R. Williamson
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.