The Atacama Cosmology Telescope: arcminute-resolution maps of 18 000 square degrees of the microwave sky from ACT 2008

DOI：

10.1088/1475-7516/2020/12/046

发表时间：

2020-07

期刊：

Journal of Cosmology and Astroparticle Physics

影响因子：

6.4

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

S. Naess;S. Aiola;J. Austermann;N. Battaglia;J. Beall;D. Becker;R. Bond;E. Calabrese;Steve K. Choi;N. Cothard;K. Crowley;O. Darwish;R. Datta;E. Denison;M. Devlin;C. Duell;S. Duff;A. Duivenvoorden;J. Dunkley;R. Dunner;A. Fox;P. Gallardo;M. Halpern;Dongwon Han;M. Hasselfield;J. Hill;G. Hilton;M. Hilton;A. Hincks;R. Hlovzek;S. Ho;J. Hubmayr;K. Huffenberger;J. Hughes;A. Kosowsky;T. Louis;M. Madhavacheril;J. McMahon;K. Moodley;F. Nati;J. Nibarger;M. Niemack;L. Page;B. Partridge;M. Salatino;E. Schaan;A. Schillaci;B. Schmitt;B. Sherwin;N. Sehgal;C. Sif'on;D. Spergel;S. Staggs;J. Stevens;E. Storer;J. Ullom;L. Vale;A. V. Engelen;J. Lanen;E. Vavagiakis;Edward J. Wollack;Zhilei Xu

本文提出了一种最大似然算法，用于将具有不同天空覆盖率、角度分辨率和空间变化的各向异性噪声的天空地图合并为单一的天空地图。我们用它来合并覆盖2008-2018年ACT观测季节的数百张单独的地图，产生到目前为止发布的最深的ACT地图。我们还将这些地图与完整的普朗克地图相结合，生成具有普朗克和ACT最佳特征的地图：普朗克在中、大角度尺度上的近乎白噪声，以及ACT在小角度尺度上的高分辨率和灵敏度。这些地图覆盖了超过18000平方度，几乎是整个天空的一半，频率分别为100、150和220 GHz。他们通过Sunyaev Zel‘dovich效应(SZ)发现了4000个光学确认的星系团，并在&gt；5σ上发现了18500个候选点源，这是迄今为止SZ星系团和毫米波源的最大单一集合。多频率地图提供了附近星系和单个银河系星云的毫米图像，甚至提供了对附近几颗恒星的清晰探测。例如，这些地图的其他预期用途包括热SZ和运动学SZ星系团叠加、CMB星系团透镜和银河系尘埃科学。该方法本身的偏差可以忽略不计。然而，由于一些成分数据集的初步性质，我们警告这些地图不应用于精确的宇宙学分析。这些地图是ACTDR5的一部分，并将在本文期刊发表后三个月内在\href{https://lambda.gsfc.nasa.gov/}{LAMBDA}上提供，以及互动天空地图集。

This paper presents a maximum-likelihood algorithm for combining sky maps with disparate sky coverage, angular resolution and spatially varying anisotropic noise into a single map of the sky. We use this to merge hundreds of individual maps covering the 2008–2018 ACT observing seasons, resulting in by far the deepest ACT maps released so far. We also combine the maps with the full Planck maps, resulting in maps that have the best features of both Planck and ACT: Planck's nearly white noise on intermediate and large angular scales and ACT's high-resolution and sensitivity on small angular scales. The maps cover over 18 000 square degrees, nearly half the full sky, at 100, 150 and 220 GHz. They reveal 4 000 optically-confirmed clusters through the Sunyaev Zel'dovich effect (SZ) and 18 500 point source candidates at > 5σ, the largest single collection of SZ clusters and millimeter wave sources to date. The multi-frequency maps provide millimeter images of nearby galaxies and individual Milky Way nebulae, and even clear detections of several nearby stars. Other anticipated uses of these maps include, for example, thermal SZ and kinematic SZ cluster stacking, CMB cluster lensing and galactic dust science. The method itself has negligible bias. However, due to the preliminary nature of some of the component data sets, we caution that these maps should not be used for precision cosmological analysis. The maps are part of ACT DR5, and will be made available on \href{https://lambda.gsfc.nasa.gov/}{LAMBDA} no later than three months after the journal publication of this article, along with an interactive sky atlas.

The Atacama Cosmology Telescope: arcminute-resolution maps of 18 000 square degrees of the microwave sky from ACT 2008–2018 data combined with Planck

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