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arXiv 1911.03005astro-ph.CO
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作为NIKA2 SZ大型计划试验案例研究的低质量星系团

A low-mass galaxy cluster as a test-case study for the NIKA2 SZ Large Program

F. Kéruzoré, R. Adam, P. Ade, P. André, A. Andrianasolo, M. Arnaud, H. Aussel, I. Bartalucci, A. Beelen, A. Benoît, A. Bideaud, O. Bourrion, M. Calvo, A. Catala… 展开作者

F. Kéruzoré, R. Adam, P. Ade, P. André, A. Andrianasolo, M. Arnaud, H. Aussel, I. Bartalucci, A. Beelen, A. Benoît, A. Bideaud, O. Bourrion, M. Calvo, A. Catalano, B. Comis, M. De Petris, F. -X. Désert, S. Doyle, E. F. C. Driessen, A. Gomez, J. Goupy, C. Kramer, B. Ladjelate, G. Lagache, S. Leclercq, J. -F. Lestrade, J. F. Macías-Pérez, P. Mauskopf, F. Mayet, A. Monfardini, L. Perotto, G. Pisano, E. Pointecouteau, N. Ponthieu, G. W. Pratt, V. Revéret, A. Ritacco, C. Romero, H. Roussel, F. Ruppin, K. Schuster, S. Shu, A. Sievers, C. Tucker, R. Zylka

摘要:

星系团中高温气体的高分辨率测绘是基于星系团的宇宙学分析的重要工具。利用IRAM 30米望远镜上运行的NIKA2毫米相机,NIKA2 SZ大型计划寻求获得45个星系团的高分辨率后续图像,这些星系团覆盖了高红移的宽质量范围,以便重新校准SZ调查宇宙学利用所需的一些工具。我们提出了这个程序的第二个聚类分析,针对样本中最微弱的来源之一,以解决这种微弱,低信噪比集群的数据减少的困难。在这项研究中,主要的挑战是精确估计亚毫米点源的污染,这极大地影响了集群的tSZ地图。我们占这种污染,通过执行一个联合适合的SZ信号和紧凑的源的通量密度。这些通量的先验知识是通过使用NIKA2和\textit{Herschel}卫星的数据对每个源的SED进行调整而得到的。第一个结果是非常有希望的,并证明了可能性,估计热力学性质与NIKA2,即使在一个紧凑的集群严重污染的点源。

英文摘要:

High-resolution mapping of the hot gas in galaxy clusters is a key tool for cluster-based cosmological analyses. Taking advantage of the NIKA2 millimeter camera operated at the IRAM 30-m telescope, the NIKA2 SZ Large Program seeks to get a high-resolution follow-up of 45 galaxy clusters covering a wide mass range at high redshift in order to re-calibrate some of the tools needed for the cosmological exploitation of SZ surveys. We present the second cluster analysis of this program, targeting one of the faintest sources of the sample in order to tackle the difficulties in data reduction for such faint, low-SNR clusters. In this study, the main challenge is the precise estimation of the contamination by sub-millimetric point sources, which greatly affects the tSZ map of the cluster. We account for this contamination by performing a joint fit of the SZ signal and of the flux density of the compact sources. A prior knowledge of these fluxes is given by the adjustment of the SED of each source using data from both NIKA2 and the \textit{Herschel} satellite. The first results are very promising and demonstrate the possibility to estimate thermodynamic properties with NIKA2, even in a compact cluster heavily contaminated by point sources.

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