论文标题
宇宙网络在星系恒星质量 - 气体金属关系的散布中的作用
The role of the cosmic web in the scatter of the galaxy stellar mass - gas metallicity relation
论文作者
论文摘要
了解宇宙网络与星系的气体含量之间的关系是了解星系进化的关键步骤。但是，宇宙网络对星系和暗物质光环的增长的影响尚未正确理解。我们使用SDSS数据报告了宇宙网络对低红移恒星形成星系的星系恒星质量金属关系的影响。银河系与恒星质量和过度密度无关的节点的接近性会影响其气相金属性，而星系接近节点的化学富集比较远的淋巴结更高。我们发现相对于细丝的作用类似但明显弱。我们通过对宇宙流体动力学模拟Illustristng（TNG300）的研究来补充观察性分析，从而发现了与我们的结果的定性一致性。使用Illustristng，我们的结果可以通过晕圈组装偏置和气体供应结合在节点组合以显着调节气体的金属性的方式来解释，从而有助于该基本关系在星系进化中的散射。
Understanding the relationship between the cosmic web and the gas content of galaxies is a key step towards understanding galaxy evolution. However, the impact of the cosmic web on the growth of galaxies and dark matter halos is not yet properly understood. We report a detection of the effect of the cosmic web on the galaxy stellar mass - gas phase metallicity relation of low redshift star-forming galaxies, using SDSS data. The proximity of a galaxy to a node, independently of stellar mass and overdensity, influences its gas-phase metallicity, with galaxies closer to nodes displaying higher chemical enrichment than those further away. We find a similar but significantly weaker effect with respect to filaments. We supplement our observational analysis with a study of the cosmological hydrodynamical simulation IllustrisTNG (TNG300), finding qualitative agreement with our results. Using IllustrisTNG, our results can be explained by both halo assembly bias and gas supply combining in nodes in a way that significantly modulates the metallicity of the gas, contributing to the scatter of this fundamental relation in galaxy evolution.
