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arXiv 2009.08822astro-ph.CO
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PSZSPT:普朗克和SPT-SZ联合星表

PSZSPT: a joint Planck and SPT-SZ cluster catalog

J. -B. Melin, J. G. Bartlett, P. Tarrío, G. W. Pratt

摘要:

我们提出的第一个集群目录提取的组合空间(普朗克)和地面(南极望远镜; SPT-SZ)毫米数据。我们开发并应用了一种匹配多滤波器(MMF),能够处理两个数据集的不同传递函数和分辨率。我们验证了当单独应用于数据集时,它产生的结果与普朗克和SPT合作的出版物一致。我们还验证了Planck和SPT-SZ团簇通量是一致的。当盲应用于组合数据集时,MMF生成了419个探测器($S/N>5$)的目录,其中323个已经是SPT-SZ或PSZ 2目录的一部分; 54个是新的SZ探测器,已在其他目录或调查中识别; 42个是新的未识别的候选者。MMF利用了这两个数据集的互补性,普朗克在探测低红移($z<0.3$)的星系团时特别有用,而SPT在寻找更高红移($z>0.3$)的来源时非常有效。这项工作代表了一个概念证明,盲聚类提取可以在从空间和地面获取的组合,不均匀的毫米数据集上进行。这一结果对于计划中的地基宇宙微波背景(CMB)实验(例如,Simons Observatory,CMB-S4)和设想的CMB空间飞行任务(例如,PICO,背光),它将检测数十万个低质量区($M_{500} \leqslant 10^{14} M_\odot$)的星团,其中星团内发射的各种来源(气体,尘埃,同步加速器)将具有相同的数量级,因此需要广泛的地面和空间频率覆盖,具有相当的空间分辨率,以进行充分的分离。

英文摘要:

We present the first cluster catalog extracted from combined space-based (Planck) and ground-based (South Pole Telescope; SPT-SZ) millimeter data. We developed and applied a matched multi-filter (MMF) capable of dealing with the different transfer functions and resolutions of the two datasets. We verified that it produces results consistent with publications from Planck and SPT collaborations when applied on the datasets individually. We also verified that Planck and SPT-SZ cluster fluxes are consistent with each other. When applied blindly to the combined dataset, the MMF generated a catalog of 419 detections ($S/N>5$), of which 323 are already part of the SPT-SZ or PSZ2 catalogs; 54 are new SZ detections, which have been identified in other catalogs or surveys; and 42 are new unidentified candidates. The MMF takes advantage of the complementarity of the two datasets, Planck being particularly useful for detecting clusters at a low redshift ($z<0.3$), while SPT is efficient at finding higher redshift ($z>0.3$) sources. This work represents a proof of concept that blind cluster extraction can be performed on combined, inhomogeneous millimeter datasets acquired from space and ground. This result is of prime importance for planned ground-based cosmic microwave background (CMB) experiments (e.g., Simons Observatory, CMB-S4) and envisaged CMB space missions (e.g., PICO, Backlight) that will detect hundreds of thousands of clusters in the low mass regime ($M_{500} \leqslant 10^{14} M_\odot$), for which the various sources of intra-cluster emission (gas, dust, synchrotron) will be of the same order of magnitude and hence require broad ground and space frequency coverage with a comparable spatial resolution for adequate separation.

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