ICM扰动对星系团平均压力廓线的影响：用MUSIC合成星系团对NIKA2 SZ大型计划的前瞻性研究
Impact of ICM disturbances on the mean pressure profile of galaxy clusters: a prospective study of the NIKA2 SZ large program with MUSIC synthetic clusters
摘要：
$Context$。星系团平均压力分布在宇宙学分析中起着重要的作用。一个准确的表征的形状，内在的散射，和红移演化的这一配置文件是必要的，以估计一些偏见和系统的影响，目前阻止宇宙学分析的基础上获得精确和公正的宇宙学约束热Sunyaev-Zel'dovich（tSZ）调查。这是正在进行的NIKA 2 SZ大型计划的主要目标之一，该计划旨在映射从$Planck$和ACT目录中选择的代表性星团样本的tSZ信号，并跨越红移范围$0.5 < z < 0.9$。$Aims$。为了估计NIKA 2探测到的团内介质（ICM）扰动对星系团平均压力分布的影响，我们基于与NIKA 2 SZ大型计划相似的合成星系团样本进行了研究。$Methods$。为了达到这一目标，我们采用流体动力学模拟$Marenostrum~MUltidark~SImulations~of~galaxy~Clusters$（音乐）。我们模拟了真实的NIKA 2和$Planck$ tSZ观测，并对其进行了联合分析，以估计每个簇的ICM压力分布。通过将解投影剖面与直接从MUSIC模拟中提取的真实径向剖面进行比较，我们可以验证NIKA 2 tSZ管道，并研究ICM扰动对ICM压力分布特性的影响，即使在高红移下。在通过流体静力平衡假设下估计的积分量对每个配置文件进行归一化后，我们评估了双样本的平均压力配置文件，并表明它与直接从MUSIC模拟中提取的可由NIKA 2恢复的尺度范围兼容。我们研究了团簇动力学状态对其形状和散射的影响。（节略）
英文摘要：
$Context$. The mean pressure profile of the galaxy cluster population plays an essential role in cosmological analyses. An accurate characterization of the shape, intrinsic scatter, and redshift evolution of this profile is necessary to estimate some of the biases and systematic effects that currently prevent cosmological analyses based on thermal Sunyaev-Zel'dovich (tSZ) surveys from obtaining precise and unbiased cosmological constraints. This is one of the main goals of the ongoing NIKA2 SZ large program, which aims at mapping the tSZ signal of a representative cluster sample selected from the $Planck$ and ACT catalogs and spans a redshift range $0.5 < z < 0.9$. $Aims$. To estimate the impact of intracluster medium (ICM) disturbances that can be detected by NIKA2 on the mean pressure profile of galaxy clusters, we realized a study based on a synthetic cluster sample that is similar to that of the NIKA2 SZ large program. $Methods$. To reach this goal we employed the hydrodynamical simulation $Marenostrum~MUltidark~SImulations~of~galaxy~Clusters$ (MUSIC). We simulated realistic NIKA2 and $Planck$ tSZ observations, which were jointly analyzed to estimate the ICM pressure profile of each cluster. A comparison of the deprojected profiles with the true radial profiles directly extracted from the MUSIC simulation allowed us to validate the NIKA2 tSZ pipeline and to study the impact of ICM disturbances on the characterization of the ICM pressure distribution even at high redshift. After normalizing each profile by the integrated quantities estimated under the hydrostatic equilibrium hypothesis, we evaluated the mean pressure profile of the twin sample and show that it is compatible with that extracted directly from the MUSIC simulation in the scale range that can be recovered by NIKA2. We studied the impact of cluster dynamical state on both its shape and associated scatter. (abridged)
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