The Atacama Cosmology Telescope: a measurement of the Cosmic Microwave Background power spectra at 98 and 150 GHz
The Atacama Cosmology Telescope: a measurement of the Cosmic Microwave Background power spectra at 98 and 150 GHz
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DOI：
10.1088/1475-7516/2020/12/045
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发表时间：
2020-12-01
影响因子：
6.4
通讯作者：
Zhu, Ningfeng
中科院分区：
文献类型：
--
作者：
Choi, Steve K.;Hasselfield, Matthew;Zhu, Ningfeng
我们呈现了由阿塔卡玛宇宙学望远镜（ACT）从2013-2016年调查的5400度（2）测量的CMB的温度和偏振角功率谱，其中包括98和150 GHz的>15000度（2）。对于本分析，我们采用了设盲策略以帮助避免确认偏倚，并且与此相关，显示了在揭盲前进行的大量系统性错误检查。使用宇宙学分析的可能性，我们约束次级源的各向异性和前景发射，并推导出一个“仅CMB”的光谱，扩展到l = 4000。在大角度尺度下，在150 GHz的前景发射类似于我们所选区域内TT和EE的1%，与普朗克发现的一致。使用相同的可能性，我们获得的宇宙学参数λ CDM的ACT数据单独与先验的光学深度τ = 0.065 +/- 0.015。Lambda CDM是一个很好的选择。最佳拟合模型具有1.07（PTE = 0.07）的简化chi（2），其中H-0 = 67.9 +/- 1.5 km/s/Mpc。我们表明，透镜BB信号与λ CDM一致，并将天体EB偏振角限制为psi（P）= 0.07度+/-0.09度。我们直接交叉关联ACT与普朗克和观察一般良好的协议，但在TE的一些差异。分析所依据的所有数据都将公开发布。
We present the temperature and polarization angular power spectra of the CMB measured by the Atacama Cosmology Telescope (ACT) from 5400 deg(2) of the 2013-2016 survey, which covers >15000 deg(2) at 98 and 150 GHz. For this analysis we adopt a blinding strategy to help avoid confirmation bias and, related to this, show numerous checks for systematic error done before unblinding. Using the likelihood for the cosmological analysis we constrain secondary sources of anisotropy and foreground emission, and derive a "CMB-only" spectrum that extends to l = 4000. At large angular scales, foreground emission at 150 GHz is similar to 1% of TT and EE within our selected regions and consistent with that found by Planck. Using the same likelihood, we obtain the cosmological parameters for Lambda CDM for the ACT data alone with a prior on the optical depth of tau = 0.065 +/- 0.015. Lambda CDM is a good fit. The best-fit model has a reduced chi(2) of 1.07 (PTE = 0.07) with H-0 = 67.9 +/- 1.5 km/s/Mpc. We show that the lensing BB signal is consistent with Lambda CDM and limit the celestial EB polarization angle to psi(P) = 0.07 degrees +/- 0.09 degrees. We directly cross correlate ACT with Planck and observe generally good agreement but with some discrepancies in TE. All data on which this analysis is based will be publicly released.