论文标题
Atacama宇宙学望远镜：98和150 GHz的宇宙微波背景功率光谱的测量值
The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectra at 98 and 150 GHz
论文作者
论文摘要
我们介绍了由Atacama Cosmology望远镜（ACT）测量的CMB的温度和极化角功率光谱，从2013-2016调查的5400 ver $^2 $，涵盖$> $> $> $> $> $> $ 15000 v $^2 $在98和150 GHz。对于此分析，我们采用了一种盲目的策略来帮助避免确认偏见，并与此相关，显示了许多检查在不闪烁之前遇到的系统错误的检查。使用宇宙学分析的可能性，我们限制了各向异性和前景发射的次要来源，并得出了“仅CMB的”频谱，该频谱延伸至$ \ ell = 4000 $。在大角度尺度上，150 GHz的前景发射为$ \ sim $ \ sim $ 1％的TT和EE占我们所选区域的1％，并且与普朗克发现的区域一致。使用相同的可能性，我们仅在$τ= 0.065 \ pm0.015 $的光学深度上获得$λ$ CDM的宇宙学参数。 $λ$ CDM非常合适。最佳拟合模型的$χ^2 $为1.07（PTE = 0.07），$ H_0 = 67.9 \ pm1.5 $ km/s/s/mpc。我们表明，镜头BB信号与$λ$ CDM一致，并将celestial EB极化角度限制为$ψ_p= -0.07^{\ circ} \ pm0.09^{\ circ} $。我们直接与普朗克进行了关联，并观察到一般的同意，但在TE中有一些差异。该分析所基于的所有数据将公开发布。
We present the temperature and polarization angular power spectra of the CMB measured by the Atacama Cosmology Telescope (ACT) from 5400 deg$^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 $\ell=4000$. At large angular scales, foreground emission at 150 GHz is $\sim$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 $Λ$CDM for the ACT data alone with a prior on the optical depth of $τ=0.065\pm0.015$. $Λ$CDM is a good fit. The best-fit model has a reduced $χ^2$ of 1.07 (PTE=0.07) with $H_0=67.9\pm1.5$ km/s/Mpc. We show that the lensing BB signal is consistent with $Λ$CDM and limit the celestial EB polarization angle to $ψ_P =-0.07^{\circ}\pm0.09^{\circ}$. 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.
