MEASUREMENTS OF SECONDARY COSMIC MICROWAVE BACKGROUND ANISOTROPIES WITH THE SOUTH POLE TELESCOPE

MEASUREMENTS OF SECONDARY COSMIC MICROWAVE BACKGROUND ANISOTROPIES WITH THE SOUTH POLE TELESCOPE
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南极望远镜对次级宇宙微波背景各向异性的测量

DOI:
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
R. Williamson
R. Williamson
中科院分区:
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文献类型:
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作者:
M. Lueker;C. Reichardt;K. Schaffer;O. Zahn;P. Ade;K. Aird;B. Benson;B. Benson;L. Bleem;J. Carlstrom;C. Chang;Hsiao;T. Crawford;A. Crites;T. Haan;M. Dobbs;E. George;N. Hall;N. Halverson;G. Holder;W. Holzapfel;J. Hrubeš;M. Joy;R. Keisler;L. Knox;Adrian T. Lee;Adrian T. Lee;E. Leitch;J. McMahon;J. McMahon;J. Mehl;S. Meyer;J. Mohr;T. Montroy;S. Padin;T. Plagge;C. Pryke;J. Ruhl;L. Shaw;L. Shaw;E. Shirokoff;H. Spieler;B. Stalder;Z. Staniszewski;A. Stark;K. Vanderlinde;J. Vieira;R. Williamson

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我们报道了从南极望远镜(SPT)在150 GHz和220 GHz观测到的第一个100°2场的宇宙微波背景(CMB)功率谱。在主各向异性占主导地位的角尺度上,ℓ≲的功率谱与标准的Λ清洁发展机制宇宙学是一致的。在较小的尺度上,我们看到了点源贡献的强有力证据,这与一群尘土飞扬的恒星形成的星系一致。在我们掩蔽亮点源之后,在这两个频率下,在3,000<ℓ<9500的角度尺度上以信噪比≳50检测到各向异性功率。我们结合150 GHz和220 GHz的数据去除了大部分点源功率,并使用点源减去谱来检测2.6Ghz的Sunyaev-Zel‘dovich(SZ)功率。在ℓ=3000时,减去的频带功率中的SZ功率为4.2WMAP5± 1.5WMAP5WMAP5宇宙学参数,显著低于基准模型预测的 功率。这种差异可能表明,当代星系团模型高估了星系团内气体的热压。或者,这一结果可以被解释为σ8值较低的证据。当结合动力学SZ贡献的估计时,测量的SZ幅度将σ8从0.794 ± 0.028的初级Cmb各向异性派生约束向下移动到0.773 ± 0.025。根据这一分析,σ8的约束中的不确定性主要是理论建模中的不确定性,该理论建模需要预测给定宇宙学参数集的SZ功率谱的幅度。
We report cosmic microwave background (CMB) power-spectrum measurements from the first 100 deg2 field observed by the South Pole Telescope (SPT) at 150 and 220 GHz. On angular scales where the primary CMB anisotropy is dominant, ℓ ≲ 3000, the SPT power spectrum is consistent with the standard ΛCDM cosmology. On smaller scales, we see strong evidence for a point-source contribution, consistent with a population of dusty, star-forming galaxies. After we mask bright point sources, anisotropy power on angular scales of 3000 < ℓ < 9500 is detected with a signal-to-noise ratio ≳50 at both frequencies. We combine the 150 and 220 GHz data to remove the majority of the point-source power and use the point-source-subtracted spectrum to detect Sunyaev–Zel'dovich (SZ) power at 2.6σ. At ℓ = 3000, the SZ power in the subtracted bandpowers is 4.2 ± 1.5 μK2, which is significantly lower than the power predicted by a fiducial model using WMAP5 cosmological parameters. This discrepancy may suggest that contemporary galaxy cluster models overestimate the thermal pressure of intracluster gas. Alternatively, this result can be interpreted as evidence for lower values of σ8. When combined with an estimate of the kinetic SZ contribution, the measured SZ amplitude shifts σ8 from the primary CMB anisotropy derived constraint of 0.794 ± 0.028 down to 0.773 ± 0.025. The uncertainty in the constraint on σ8 from this analysis is dominated by uncertainties in the theoretical modeling required to predict the amplitude of the SZ power spectrum for a given set of cosmological parameters.
DOI: 10.1088/0004-637x/701/2/1958
发表时间: 1958
期刊: The Astrophysical Journal
影响因子: --
作者:
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DOI: 10.1088/0067-0049/192/2/18
发表时间: 2011-02-01
影响因子: 8.7
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DOI: 10.1088/0004-637x/700/2/l187
发表时间: 2009
期刊: The Astrophysical Journal
影响因子: --
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