arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2302.07936astro-ph.COastro-ph.GAphysics.comp-ph
收藏

利用动力学 Sunyaev-Zeldovich 效应在 MACSIS 模拟中揭示星系团旋转

Galaxy cluster rotation revealed in the MACSIS simulations with the kinetic Sunyaev-Zeldovich effect

Edoardo Altamura, Scott T. Kay, Jens Chluba, Imogen Towler

AI总结:

本研究利用 MACSIS 流体动力学模拟分析了大质量星系团中介质大尺度运动引起的旋转 kSZ 效应,评估了不同物理条件下的信号幅度,发现暗物质、星系和气体自旋的不对齐会导致估计次优,并提供了自旋-质量标度关系以支持未来 CMB 和 X 射线观测的建模与预测。

摘要:

动力学 Sunyaev-Zeldovich (kSZ) 效应现已成为当前和未来宇宙微波背景 (CMB) 及宇宙学研究明确的目标。除了星系团的整体运动外,内部运动也会导致 kSZ 信号。在这项工作中,我们使用星系团流体动力学宇宙学模拟研究了由团簇介质相干大尺度运动引起的旋转 kSZ 效应。为了将旋转 kSZ 用作宇宙学探针,模拟提供了一些最全面的数据集,可以为该信号的建模提供信息。在这项工作中,我们使用 MACSIS 数据集专门研究大质量星系团中的旋转 kSZ 效应。基于这些模型,我们测试了叠加方法,并估计了在不同质量、动力学状态、红移和图对齐几何形状下的组合信号幅度。我们发现暗物质、星系和气体的自旋通常是不对齐的,这种效应会导致在基于星系运动时对旋转 kSZ 效应的估计次优。此外,我们提供了晕自旋-质量标度关系,可用于构建旋转 kSZ 的统计模型。旋转 kSZ 贡献在大质量非弛豫星系团中最大($\gtrsim$100 $μ$K),可能与高阶 CMB 温度信号(例如运动透镜效应)的研究相关。MACSIS 样本有限的质量范围强烈推动了在大体积模拟中对旋转 kSZ 效应的扩展研究,以完善建模,特别是向更低质量和更高红移方向,并为即将开展的宇宙学 CMB 实验(例如 Simons Observatory、SKA-2)和 X 射线观测(例如 Athena/X-IFU)提供预测。

英文摘要:

The kinetic Sunyaev-Zeldovich (kSZ) effect has now become a clear target for ongoing and future studies of the cosmic microwave background (CMB) and cosmology. Aside from the bulk cluster motion, internal motions also lead to a kSZ signal. In this work, we study the rotational kSZ effect caused by coherent large-scale motions of the cluster medium using cluster hydrodynamic cosmological simulations. To utilise the rotational kSZ as a cosmological probe, simulations offer some of the most comprehensive data sets that can inform the modelling of this signal. In this work, we use the MACSIS data set to investigate the rotational kSZ effect in massive clusters specifically. Based on these models, we test stacking approaches and estimate the amplitude of the combined signal with varying mass, dynamical state, redshift and map-alignment geometry. We find that the dark matter, galaxy and gas spins are generally misaligned, an effect that can cause a sub-optimal estimation of the rotational kSZ effect when based on galaxy motions. Furthermore, we provide halo-spin-mass scaling relations that can be used to build a statistical model of the rotational kSZ. The rotational kSZ contribution, which is largest in massive unrelaxed clusters ($\gtrsim$100 $μ$K), could be relevant to studies of higher-order CMB temperature signals, such as the moving lens effect. The limited mass range of the MACSIS sample strongly motivates an extended investigation of the rotational kSZ effect in large-volume simulations to refine the modelling, particularly towards lower mass and higher redshift, and provide forecasts for upcoming cosmological CMB experiments (e.g. Simons Observatory, SKA-2) and X-ray observations (e.g. Athena/X-IFU).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑