论文标题
Atacama宇宙学望远镜：DR4地图和宇宙学参数
The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
论文作者
论文摘要
我们使用2013 - 2016年从98和150 GHz获取的数据，介绍了来自Atacama宇宙学望远镜的宇宙微波背景温度和极化各向异性的新的弧形分辨率图。这些地图覆盖了17,000度$^2 $，最深的600度$^2 $，噪声水平低于10 $μ$ k-arcmin。我们使用这些地图的近6,000度$^2 $衍生的功率谱来限制宇宙学。该ACT数据能够测量类似发散的极化和温度各向异性的角度尺度，从而在最后散射下均可追踪速度和密度。从这些方面可以得出到达最后一个碎片表面的距离，从而推断局部膨胀率$ h_0 $。通过将ACT数据与来自WMAP的大规模信息相结合，我们测量$ H_0 = 67.6 \ PM 1.1 $ km/s/mpc，以68％的信心，与独立测量的Planck卫星估算值非常吻合（单独的ACT，我们发现$ H_0 = 67.9 = 67.9 \ pm 1.5 $ $ km/s/s/s/s/mpc）。 $λ$ CDM型号非常适合ACT数据，我们没有发现偏差的证据：空间曲率和偏离频谱中标准镜头信号的偏离都为零至1 $σ$之内；相对论物种的数量，原始的氦分数和光谱指数的运行与$λ$ CDM的预测一致，至$1.5-2.2σ$。我们比较了参数级别的行为，WMAP和Planck，并找到良好的一致性；我们研究了相关光谱指数和重子密度参数的约束如何在添加CMB大规模信息时是否重新调整了无法测量的大规模信息。此处介绍的DR4产品将在NASA Legacy Archive上公开发布，以进行微波背景数据分析。
We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from the Atacama Cosmology Telescope, using data taken from 2013-2016 at 98 and 150 GHz. The maps cover more than 17,000 deg$^2$, the deepest 600 deg$^2$ with noise levels below 10 $μ$K-arcmin. We use the power spectrum derived from almost 6,000 deg$^2$ of these maps to constrain cosmology. The ACT data enable a measurement of the angular scale of features in both the divergence-like polarization and the temperature anisotropy, tracing both the velocity and density at last-scattering. From these one can derive the distance to the last-scattering surface and thus infer the local expansion rate, $H_0$. By combining ACT data with large-scale information from WMAP we measure $H_0 = 67.6 \pm 1.1$ km/s/Mpc, at 68% confidence, in excellent agreement with the independently-measured Planck satellite estimate (from ACT alone we find $H_0 = 67.9 \pm 1.5$ km/s/Mpc). The $Λ$CDM model provides a good fit to the ACT data, and we find no evidence for deviations: both the spatial curvature, and the departure from the standard lensing signal in the spectrum, are zero to within 1$σ$; the number of relativistic species, the primordial Helium fraction, and the running of the spectral index are consistent with $Λ$CDM predictions to within $1.5 - 2.2σ$. We compare ACT, WMAP, and Planck at the parameter level and find good consistency; we investigate how the constraints on the correlated spectral index and baryon density parameters readjust when adding CMB large-scale information that ACT does not measure. The DR4 products presented here will be publicly released on the NASA Legacy Archive for Microwave Background Data Analysis.
