Consistency of cosmic microwave background temperature measurements in three frequency bands in the 2500-square-degree SPT-SZ survey

Consistency of cosmic microwave background temperature measurements in three frequency bands in the 2500-square-degree SPT-SZ survey
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2500平方度SPT-SZ巡天宇宙微波背景温度测量三个频段的一致性

DOI:
10.1088/1475-7516/2019/07/038
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发表时间:
2019
影响因子:
6.4
通讯作者:
Crites, A.T.
Crites, A.T.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Mocanu, L.M.;Crawford, T.M.;Aylor, K.;Benson, B.A.;Bleem, L.E.;Carlstrom, J.E.;Chang, C.L.;Cho, H.-M.;Chown, R.;Crites, A.T.

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利用南极望远镜(SPT)SZ巡天的三波段数据,对南极望远镜(SPT)测量的宇宙微波背景(CMB)温度各向异性进行了内部一致性检验。这些测量是从观测的2500 - 2的天空中的三个频段集中在95,150和220 GHz。我们联合收割机的信息,从这三个波段到六个半独立的估计的CMB功率谱(三个单频功率谱和三个交叉频谱)在多极范围650< 3000。我们从每个功率谱中减去前景功率的估计,并评估所得的仅CMB谱之间的一致性。我们确定六个前景清洁的功率谱与零假设一致,其中六个清洁的谱仅包含CMB功率和噪声。数据与该模型的拟合得到235个自由度的χ 2值为236.3,超过该χ 2值的概率为46%。
We present an internal consistency test of South Pole Telescope (SPT) measurements of the cosmic microwave background (CMB) temperature anisotropy using three-band data from the SPT-SZ survey. These measurements are made from observations of∼ 2500 2 of sky in three frequency bands centered at 95, 150, and 220 GHz. We combine the information from these three bands into six semi-independent estimates of the CMB power spectrum (three single-frequency power spectra and three cross-frequency spectra) over the multipole range 650< ℓ< 3000. We subtract an estimate of foreground power from each power spectrum and evaluate the consistency among the resulting CMB-only spectra. We determine that the six foreground-cleaned power spectra are consistent with the null hypothesis, in which the six cleaned spectra contain only CMB power and noise. A fit of the data to this model results in a χ 2 value of 236.3 for 235 degrees of freedom, and the probability to exceed this χ 2 value is 46%.
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