Luminous matter produces very energetic events, such as active galactic nuclei and supernova explosions, that significantly affect the internal regions of galaxy clusters. Although the current uncertainty in the effect of baryonic physics on cluster statistics is subdominant as compared to other systematics, the picture is likely to change soon as the amount of high-quality data is growing fast, urging the community to keep theoretical systematic uncertainties below the ever-growing statistical precision. In this paper, we study the effect of baryons on galaxy clusters, and their impact on the cosmological applications of clusters, using the Magneticum suite of cosmological hydrodynamical simulations. We show that the impact of baryons on the halo mass function can be recasted in terms on a variation of the mass of the halos simulated with pure N-body, when baryonic effects are included. The halo mass function and halo bias are only indirectly affected. Finally, we demonstrate that neglecting baryonic effects on halos mass function and bias would significantly alter the inference of cosmological parameters from high-sensitivity next-generations surveys of galaxy clusters.

中文翻译：

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重子对晕质量函数、偏差和星团宇宙学的影响

发光物质会产生非常活跃的事件，例如活跃的星系核和超新星爆炸，这些事件会显着影响星系团的内部区域。尽管与其他系统学相比，重子物理学对集群统计影响的当前不确定性是次要的，但随着高质量数据量的快速增长，情况可能很快就会发生变化，敦促社区将理论系统不确定性保持在低于不断提高的统计精度。在本文中，我们使用 Magneticum 宇宙流体动力学模拟套件研究重子对星系团的影响，以及它们对星系团宇宙学应用的影响。我们表明，当包含重子效应时，重子对晕质量函数的影响可以根据用纯 N 体模拟的晕质量的变化重新计算。光晕质量函数和光晕偏差仅受到间接影响。最后，我们证明忽略重子对晕质量函数和偏差的影响将显着改变从下一代高灵敏度星系团调查中推断出的宇宙学参数。