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arXiv 2008.04334astro-ph.CO
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X射线观测和模拟的去偏星系团压力分布

Debiased Galaxy Cluster Pressure Profiles from X-ray Observations and Simulations

Yizhou He, Philip Mansfield, Markus M. Rau, Hy Trac, Nicholas Battaglia

摘要:

我们提出了一个更新的平均集群压力分布模型,调整流体静力学质量偏差相结合的结果从X射线观测与宇宙学模拟。我们的模型估计这种偏差拟合幂律之间的关系“真正的”晕质量和X射线集群质量的流体动力学模拟(IllustrisTNG,BAHAMAS,和MACSIS)。作为一个应用实例,我们考虑了REXCESS X射线团簇样品和从缩放和堆叠的压力分布导出的通用压力分布(UPP)。我们发现调整后的质量,$M_\mathrm{500c},$是$\lesssim$高15%和缩放的压力$P/P_\mathrm{500c}$有$\lesssim$ 35%,低于以前推断的归一化。我们的去偏压力分布(DPP)与广义Navarro-Frenk-White(GNFW)函数拟合良好,参数为$[P_0,c_{500},α,β,γ]=[5.048,1.217,1.192,5.490,0.433]$,不需要质量相关校正项。当DPP被用来模拟的Sunyaev-Zel'dovich(SZ)效应,我们发现,集成的康普顿$Y-M$关系只有轻微的偏离自相似标度。热SZ角功率谱的幅度低约30%,假设标称宇宙学参数(例如$Ω_\text{m}=0.3$,$σ_8 = 0.8$),并广泛地与最近的普朗克结果一致,而不需要额外的偏置校正。

英文摘要:

We present an updated model for the average cluster pressure profile, adjusted for hydrostatic mass bias by combining results from X-ray observations with cosmological simulations. Our model estimates this bias by fitting a power-law to the relation between the "true" halo mass and X-ray cluster mass in hydrodynamic simulations (IllustrisTNG, BAHAMAS, and MACSIS). As an example application, we consider the REXCESS X-ray cluster sample and the Universal Pressure Profile (UPP) derived from scaled and stacked pressure profiles. We find adjusted masses, $M_\mathrm{500c},$ that are $\lesssim$15% higher and scaled pressures $P/P_\mathrm{500c}$ that have $\lesssim$35% lower normalization than previously inferred. Our Debiased Pressure Profile (DPP) is well-fit by a Generalized Navarro-Frenk-White (GNFW) function, with parameters $[P_0,c_{500},α,β,γ]=[5.048,1.217,1.192,5.490,0.433]$ and does not require a mass-dependent correction term. When the DPP is used to model the Sunyaev-Zel'dovich (SZ) effect, we find that the integrated Compton $Y-M$ relation has only minor deviations from self-similar scaling. The thermal SZ angular power spectrum is lower in amplitude by approximately 30%, assuming nominal cosmological parameters (e.g. $Ω_\text{m}=0.3$, $σ_8 = 0.8$), and is broadly consistent with recent Planck results without requiring additional bias corrections.

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