在NIKA2 SZ大型计划中利用NIKA2/XMM-Newton成像协同效应研究中等质量、高$z$星系团
Exploiting NIKA2/XMM-Newton imaging synergy for intermediate mass, high-$z$ galaxy clusters within the NIKA2 SZ Large Program
摘要：
高分辨率的星系团内介质（ICM）映射到高红移和低质量是至关重要的，以获得准确的质量估计的星系团，并了解系统的影响基于星系团的宇宙学研究的影响。我们提出了一个空间分辨的Sunyaev-Zel'dovich（SZ）/X射线分析的ACT-CL J0215.4+0030，一个高红移（$z=0.865$）星系团的中等质量（$M_{500}\simeq3.5\times10^{14}\;\mathrm{M_\odot}$）的一部分，正在进行的NIKA 2 SZ大型计划，一个后续的代表性样本的对象在$0.5 \leqslant z \leqslant 0.9$。除了由质量和红移引起的模糊和小角尺寸外，星团还受到点源的污染，这对SZ信号产生了显着影响。因此，对于NIKA 2聚类样本中最具挑战性的来源，这是一个有趣的案例研究。我们提出了这个集群的NIKA 2观测和由此产生的数据。我们重建ICM的压力分布进行联合分析的SZ信号和NIKA 2 150 GHz的地图中的点源。我们得到高质量的估计ICM的化学性质与NIKA 2。我们比较从NIKA 2地图中提取的压力分布，仅通过对集群的XMM-牛顿观测进行解投影从X射线数据获得的压力分布。我们将NIKA 2压力曲线与X射线反投影密度相结合，以提取ICM的详细信息。热力学性质的径向分布表明团簇具有扰动核。集群的流体静力学质量是兼容的SZ和X射线标度关系的估计。我们的结论是，NIKA 2 SZ大程序可以提供高质量的信息，即使是其最微弱的集群之一的ICM的热力学，经过仔细处理的污染点源。
英文摘要：
High-resolution mapping of the intra-cluster medium (ICM) up to high redshift and down to low masses is crucial to derive accurate mass estimates of the galaxy cluster and to understand the systematic effects affecting cosmological studies based on galaxy clusters. We present a spatially-resolved Sunyaev-Zel'dovich (SZ)/X-ray analysis of ACT-CL J0215.4+0030, a high redshift ($z=0.865$) galaxy cluster of intermediate mass ($M_{500}\simeq3.5\times10^{14}\;\mathrm{M_\odot}$) observed as part of the ongoing NIKA2 SZ Large Program, a follow up of a representative sample of objects at $0.5 \leqslant z \leqslant 0.9$. In addition to the faintness and small angular size induced by its mass and redshift, the cluster is contaminated by point sources that significantly affect the SZ signal. Therefore, this is an interesting case study for the most challenging sources of the NIKA2 cluster sample. We present the NIKA2 observations of this cluster and the resulting data. We reconstruct the ICM pressure profile by performing a joint analysis of the SZ signal and of the point sources in the NIKA2 150 GHz map. We obtain high-quality estimates of the ICM thermodynamical properties with NIKA2. We compare the pressure profile extracted from the NIKA2 map to the pressure profile obtained from X-ray data only by deprojecting XMM-Newton observations of the cluster. We combine the NIKA2 pressure profile with the X-ray deprojected density to extract detailed information on the ICM. The radial distribution of its thermodynamic properties indicate that the cluster has a disturbed core. The hydrostatic mass of the cluster is to be compatible with estimations from SZ and X-rays scaling relations. We conclude that the NIKA2 SZ large program can deliver quality information on the thermodynamics of the ICM even for one of its faintest clusters, after a careful treatment of the contamination by point sources.
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