The Atacama Cosmology Telescope: DR4 maps and cosmological parameters
The Atacama Cosmology Telescope: DR4 maps and cosmological parameters
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DOI：
10.1088/1475-7516/2020/12/047
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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：
Aiola, Simone;Calabrese, Erminia;Zhu, Ningfeng
我们使用2013-2016年在98和150 GHz采集的数据，从阿塔卡玛宇宙望远镜中呈现了新的宇宙微波背景温度和偏振各向异性的弧分分辨率地图。地图覆盖超过17，000 deg（2），最深600 deg（2），噪声水平低于10 mu K-arcmin。我们使用从这些地图中的近6,000度（2）导出的功率谱来约束宇宙学。ACT数据能够测量发散样偏振和温度各向异性中特征的角尺度，跟踪最后散射时的速度和密度。从这些可以推导出到最后散射表面的距离，从而推断出局部膨胀率H-0。通过将ACT数据与来自WMAP的大尺度信息相结合，我们测量出H-0 = 67.6 +/- 1.1 km/s/Mpc，置信度为68%，与独立测量的普朗克卫星估计值非常一致（仅从ACT中，我们发现H-0 = 67.9 +/- 1.5 km/s/Mpc）。λ CDM模型提供了一个很好的拟合ACT数据，我们没有发现任何偏差的证据：空间曲率和偏离光谱中的标准透镜信号，都是零到1西格玛内;相对论性物种的数量，原始氦部分，和光谱指数的运行与λ CDM预测一致，在1.5-2.2西格玛内。我们比较ACT，WMAP，普朗克在参数水平上，发现良好的一致性，我们调查的相关谱指数和重子密度参数的约束如何重新调整时，加入CMB大尺度的信息，ACT不测量。这里介绍的DR 4产品将在NASA微波背景数据分析遗产档案中公开发布。
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 mu 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 +/- 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 +/- 1.5 km/s/Mpc). The Lambda 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 sigma; the number of relativistic species, the primordial Helium fraction, and the running of the spectral index are consistent with Lambda CDM predictions to within 1.5-2.2 sigma. 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.