Title: Impact of cosmic web on the properties of galaxies in IllustrisTNG simulations Show Chinese title

Title: 宇宙网对IllustrisTNG模拟中星系性质的影响

Abstract: We investigate the influence of the cosmic web on galaxy properties in the IllustrisTNG simulations. To disentangle the effects of galaxy groups and cosmic filaments, we classify the cosmic web environment into four categories: group, group-dominated, filament-dominated, and field. By controlling for stellar mass, we reveal evident differences in specific star formation rates (sSFR), quenched fraction, gas fractions, local density, and stellar ages among central galaxies in different cosmic web environments, particularly for lower-mass galaxies. However, these differences largely diminish when the effect of local overdensity is further accounted for, indicating its dominant role. Additionally, we observe distinct differences in these properties among satellite galaxies across environments, mainly driven by stellar mass, halo mass, and overdensity. Notably, residual differences between satellites in field and filament-dominated region persist even after controlling for these factors, suggesting a stronger susceptibility of satellite galaxies to filaments compared to centrals. Our findings highlight the importance of differentiating between central and satellite to accurately assess the environmental effects of the cosmic web. Our analysis suggests that the relationship between galaxy properties and their distance from filaments arises from a combination of factors, including stellar and halo mass, groups, overdensity, and the intrinsic influence of the cosmic web. Additionally, we find that the effect of the cosmic web on galaxy properties is reduced at $z=0.5$, compared to $z=0$. Furthermore, central galaxies near thick filaments tend to exhibit slightly to moderately lower sSFR and cold gas fractions compared to those near thin filaments. Show Chinese abstract

Abstract: 我们研究了宇宙网对 IllustrisTNG 模拟中星系属性的影响。 为了区分星系团和宇宙丝线的影响，我们将宇宙网环境分为四类：星系团、以星系团为主导、以宇宙丝线为主导以及场区。 通过控制恒星质量，我们揭示了不同宇宙网环境中中心星系的比恒星形成率（sSFR）、淬灭比例、气体比例、局部密度和恒星年龄之间的显著差异，特别是对低质量星系而言。 然而，当进一步考虑局地超密度效应时，这些差异大多消失，表明局地超密度起主导作用。 此外，我们观察到卫星星系在不同环境中的这些属性存在明显差异，主要由恒星质量、暗晕质量和超密度驱动。 值得注意的是，在场区和以丝线为主导区域的卫星星系之间仍存在残余差异，即使控制了这些因素，这表明卫星星系比中心星系更容易受到丝线的影响。 我们的发现强调了区分中心星系和卫星星系对于准确评估宇宙网环境效应的重要性。 我们的分析表明，星系属性与其与丝线距离的关系源于多种因素的综合作用，包括恒星质量、暗晕质量、星系团、超密度以及宇宙网本身的内在影响。 此外，我们发现与$z=0$相比，在$z=0.5$处宇宙网对星系属性的影响较小。 另外，靠近厚丝线的中心星系相比靠近薄丝线的中心星系往往表现出稍低至中等程度的 sSFR 和冷气体比例。