论文标题
暗物质中的暗物质，气体和恒星曲线的相关性
Correlations of Dark Matter, Gas and Stellar Profiles in Dark Matter Halos
论文作者
论文摘要
相似质量和红移的光环在其差异性质（例如暗物质，热气体和恒星质量密度曲线）的差异性上很大。这种可变性是这些暗物质光环的形成历史中多样性的指标，这些变化反映在平均关系的散布耦合中。在这项工作中，我们表明该耦合的强度取决于测量光环曲线的规模。通过分析Illustristng流体动力学宇宙学模拟的输出，我们报告了使用暗物质卤代种群多样性的暗物质，热气和恒星质量径向密度之间的径向依赖和质量依赖的耦合。我们发现，对于相同的质量光环，重气质和暗物质密度的散射在大尺度上强烈耦合（$ r> r_ {200} $）;但是，气体和暗物质密度之间的耦合在光晕的核心附近逐渐消失（$ r <0.3 r_ {200} $）。然后，我们表明，当在其质量以外的其他属性上选择光环时，光环曲线和集成量之间的相关性在光晕的轮廓可观察到的剖面构件中诱导了半径依赖性的加性偏置。我们讨论了通过多波长宇宙学调查对这种影响对簇丰度和互相关宇宙学的影响。
Halos of similar mass and redshift exhibit a large degree of variability in their differential properties, such as dark matter, hot gas, and stellar mass density profiles. This variability is an indicator of diversity in the formation history of these dark matter halos that is reflected in the coupling of scatters about the mean relations. In this work, we show that the strength of this coupling depends on the scale at which halo profiles are measured. By analyzing the outputs of the IllustrisTNG hydrodynamical cosmological simulations we report the radial- and mass-dependent couplings between the dark matter, hot gas, and stellar mass radial density profiles utilizing the population diversity in dark matter halos. We find that for the same mass halos the scatters in the density of baryons and dark matter are strongly coupled at large scales ($r>R_{200}$); but the coupling between gas and dark matter density profiles fades near the core of halos ($r < 0.3 R_{200}$). We then show that the correlation between halo profile and integrated quantities induces a radius-dependent additive bias in the profile observables of halos when halos are selected on properties other than their mass. We discuss the impact of this effect on cluster abundance and cross-correlations cosmology with multi-wavelength cosmological surveys.
