通过热苏尼亚耶夫-泽尔多维奇效应约束星系团内介质中的有效粘性——来自SLOW约束后发星系团模拟的预测
Constraining Effective Viscosity in the Intracluster Medium via the Thermal Sunyaev-Zeldovich Effect -- Predictions from the SLOW Constrained Coma Cluster Simulations
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中文总结 AI 辅助
研究通过热苏尼亚耶夫-泽尔多维奇效应约束星系团内介质有效粘性，利用SLOW模拟不同粘性水平的后发星系团，生成地图分析统计数据并与普朗克观测比较，发现有效粘性低于斯皮策值5%，验证了SZ效应约束粘性的有效性。
中文摘要 AI 辅助
我们研究了粘性对模拟的约束后发星系团类似物中苏尼亚耶夫-泽尔多维奇信号的影响，旨在为星系团内介质（ICM）中的粘性量提供替代约束。我们使用来自SLOW约束模拟的LOWER DECKS放大的具有不同粘性水平的后发星系团实现，生成模拟的热和动力学苏尼亚耶夫-泽尔多维奇地图并分析其统计数据，与普朗克观测进行比较。粘性在热SZ（tSZ）轮廓中显示出一致趋势，增加中心信号并抑制边缘信号，对tSZ功率谱也有强烈影响。与普朗克观测的比较表明，ICM有效粘性低于斯皮策值的5%。反锐化掩膜揭示了对小尺度的影响，但目前观测数据尚无法检测。热苏尼亚耶夫-泽尔多维奇效应呈现出清晰一致的趋势，可用于探测ICM的有效粘性。我们的分析表明ICM粘性被抑制到低于斯皮策值的5%，与之前的X射线分析一致，验证了SZ效应作为约束ICM粘性的独立方法的有效性。
英文摘要
We study the effect of viscosity on the Sunyaev-Zeldovich signal in a simulated constrained Coma cluster analog. We aim to provide alternative constraints on the amount of viscosity in the ICM. We use the Coma cluster realization with different levels of viscosity from the LOWER DECKS zoom-ins of the SLOW constrained simulations. We generate mock thermal and kinetic Sunyaev-Zeldovich maps and and analyze their statistics. We compare them to Planck observations. Viscosity shows a consistent trend in thermal SZ (tSZ) profiles, increasing the signal in the center and suppressing it in the outskirts. Viscosity also has a strong effect on the tSZ power spectrum, elevating its amplitude on all scales. Comparisons with Planck observations suggest that the effective ICM viscosity is below $5\%$ of the Spitzer value. Unsharp masking reveals an effect on small scales, which are, however, not yet detectable with current observational data. The thermal Sunyaev-Zeldovich effect shows clear and consistent trends that allow us to probe the effective viscosity of the ICM. Our analysis suggests suppressed ICM viscosity below $5\%$ of the Spitzer value, consistent with previous X-ray analysis. Our results validate the strength of the SZ effect as an independent method to constrain ICM viscosity.
