We analyze a set of volume limited samples from the SDSS to study the dependence of galaxy colour on different environments of the cosmic web. We measure the local dimension of galaxies to determine the geometry of their embedding environments and find that filaments host a higher fraction of red galaxies than sheets at each luminosity. We repeat the analysis at a fixed density and recover the same trend which shows that galaxy colours depend on geometry of environments besides local density. At a fixed luminosity, the fraction of red galaxies in filaments and sheets increases with the extent of these environments. This suggests that the bigger structures have a larger baryon reservoir favouring higher accretion and larger stellar mass. We find that the mean colour of the red and blue populations are systematically higher in the environments with smaller local dimension and increases monotonically in all the environments with luminosity. We observe that the bimodal nature of the galaxy colour distribution persists in all environments and all luminosities, which suggests that the transformation from blue to red galaxy can occur in all environments.

中文翻译：

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使用SDSS探索宇宙网不同环境中的星系颜色

我们分析了一组来自 SDSS 的体积受限样本，以研究星系颜色对宇宙网不同环境的依赖性。我们测量星系的局部尺寸以确定它们嵌入环境的几何形状，并发现在每个光度下，细丝承载的红色星系比例高于片层。我们以固定密度重复分析并恢复相同的趋势，这表明除了局部密度之外，星系的颜色还取决于环境的几何形状。在固定光度下，细丝和片状红色星系的比例随着这些环境的范围而增加。这表明更大的结构具有更大的重子储库，有利于更高的吸积和更大的恒星质量。我们发现红色和蓝色种群的平均颜色在局部维度较小的环境中系统地较高，并且在所有具有光度的环境中单调增加。我们观察到星系颜色分布的双峰性质在所有环境和所有光度中持续存在，这表明从蓝色星系到红色星系的转变可以发生在所有环境中。