A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data
A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data
复制标题
南极望远镜和普朗克数据确定的地图和功率谱的比较
DOI：
10.3847/1538-4357/aaa3ef
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
R. Williamson
中科院分区：
文献类型：
--
作者：
Z. Hou;K. Aylor;B. Benson;B. Benson;L. Bleem;J. Carlstrom;C. Chang;C. Chang;H.;R. Chown;T. Crawford;A. Crites;A. Crites;T. Haan;T. Haan;M. Dobbs;M. Dobbs;W. Everett;B. Follin;E. George;E. George;N. Halverson;N. Harrington;G. Holder;G. Holder;G. Holder;W. Holzapfel;J. Hrubeš;R. Keisler;R. Keisler;L. Knox;Adrian T. Lee;Adrian T. Lee;E. Leitch;D. Luong;D. Marrone;J. McMahon;S. Meyer;M. Millea;L. Mocanu;J. Mohr;T. Natoli;T. Natoli;Y. Omori;S. Padin;C. Pryke;C. Reichardt;C. Reichardt;J. Ruhl;J. Sayre;J. Sayre;K. Schaffer;K. Schaffer;E. Shirokoff;E. Shirokoff;Z. Staniszewski;Z. Staniszewski;A. Stark;K. Story;K. Vanderlinde;J. Vieira;R. Williamson
我们研究了150 GHz的数据从南极望远镜（SPT）和143 GHz的数据从普朗克卫星的SPT-SZ调查所覆盖的天空补丁的一致性。我们首先视觉上比较地图，发现残差在考虑角分辨率和滤波的差异后与噪声一致。然后，我们计算（1）SPT数据的两个独立的一半之间的互谱，（2）普朗克数据的两个独立的一半之间的互谱，以及（3）SPT和普朗克数据之间的互谱。我们发现，这三个交叉光谱通过零假设很好地拟合（PTE = 0.30），其中两个实验都测量了相同的天空地图，直到单个自由校准参数-即，我们在两个数据集中都没有发现系统性错误的证据。作为一个副产品，我们提高了精度的SPT校准近一个数量级，从2.6%到0.3%的权力。最后，我们比较了所有三个交叉光谱的全天空普朗克功率谱，并找到边际证据的SPT-SZ足迹和全天空的功率谱之间的差异。我们将这些差异建模为球谐多极数的幂律。该倾斜的最佳拟合值在SPT-SZ足迹中的三个互谱中是一致的，这意味着该倾斜的来源是SPT-SZ区域相对于全天空的样本方差波动。从这些数据集得出的宇宙学参数的一致性将在配套文件中讨论。
We study the consistency of 150 GHz data from the South Pole Telescope (SPT) and 143 GHz data from the Planck satellite over the patch of sky covered by the SPT-SZ survey. We first visually compare the maps and find that the residuals appear consistent with noise after accounting for differences in angular resolution and filtering. We then calculate (1) the cross-spectrum between two independent halves of SPT data, (2) the cross-spectrum between two independent halves of Planck data, and (3) the cross-spectrum between SPT and Planck data. We find that the three cross-spectra are well fit (PTE = 0.30) by the null hypothesis in which both experiments have measured the same sky map up to a single free calibration parameter—i.e., we find no evidence for systematic errors in either data set. As a by-product, we improve the precision of the SPT calibration by nearly an order of magnitude, from 2.6% to 0.3% in power. Finally, we compare all three cross-spectra to the full-sky Planck power spectrum and find marginal evidence for differences between the power spectra from the SPT-SZ footprint and the full sky. We model these differences as a power law in spherical harmonic multipole number. The best-fit value of this tilt is consistent among the three cross-spectra in the SPT-SZ footprint, implying that the source of this tilt is a sample variance fluctuation in the SPT-SZ region relative to the full sky. The consistency of cosmological parameters derived from these data sets is discussed in a companion paper.
影响因子：
8.6
作者：
R. Battye;A. Moss
通讯作者：
R. Battye;A. Moss