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arXiv 1902.00350astro-ph.CO
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PACT I:组合ACT和Planck数据用于tSZ信号的最佳检测

PACT I: Combining ACT and Planck data for optimal detection of tSZ signal

N. Aghanim, M. Douspis, G. Hurier, D. Crichton, J. -M. Diego, M. Hasselfield, J. Macias-Perez, T. A. Marriage, E. Pointecouteau, M. Remazeilles, E. Soubrie

摘要:

我们提出的热Sunyaev-Zel'dovich(tSZ)效应信号的最佳重建的基础上的一个异构的数据集组成的ACT和普朗克数据的组合,具有不同数量的通道,角分辨率和噪声水平。我们使用两种不同的方法组合这两个数据集,匹配多滤波器(MMF)技术和优化的内部线性组合(ILC)。我们表明,当应用的MMF的ACT和普朗克数据的组合,大小通量简并减少,并与他们的SZ信号检测到的集群的信噪比提高了三个因素。在优化的ILC方法的情况下,我们表明,tSZ地图重建的分辨率为$\sim 1.5$弧分。与普朗克分辨率相比,这是一个超过两倍的改进,并且具有非常好的噪声控制,即仅受单个实验的固有噪声的限制。ACT和普朗克数据的组合提供了一个独特的机会,以改善研究的压力分布,并通过他们的tSZ研究在集群的子结构。

英文摘要:

We present the optimal reconstruction of the thermal Sunyaev-Zel'dovich (tSZ) effect signal based on the combination of a heterogeneous dataset consisting of ACT and Planck data, with different numbers of channels, angular resolutions and noise levels. We combine both datasets using two different approaches, a Matched Multi-Filter (MMF) technique and an optimised Internal Linear Combination (ILC). We show that when applying the MMF to the combination of ACT and Planck data, the size-flux degeneracy is reduced and the signal-to-noise of clusters detected with their SZ signal improves by up to a factor of three. In the case of the optimised ILC method, we show that the tSZ map is reconstructed with a resolution of $\sim 1.5$ arcmin. This is more than a factor two improvement compared with the Planck resolution, and with a very good control of noise, i.e. limited only by the intrinsic noise of the individual experiments. The combination of ACT and Planck data offers a unique opportunity to improve on the study of the pressure profiles and to study substructure in clusters through their tSZ.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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