论文标题
使用SDS探索星系颜色在宇宙网络的不同环境中
Exploring galaxy colour in different environments of the cosmic web with SDSS
论文作者
论文摘要
我们分析了一组来自SDSS的体积有限的样本，以研究星系颜色对宇宙网络不同环境的依赖性。我们测量星系的局部尺寸，以确定其嵌入环境的几何形状，并发现在每种光度下，细丝的红色星系占红色星系的比例更高。我们以固定密度重复分析，并恢复相同的趋势，该趋势表明，除了局部密度之外，星系颜色取决于环境的几何形状。在固定的亮度下，丝和薄片中红色星系的比例随这些环境的程度增加。这表明较大的结构具有较大的Baryon储层，有利于更高的积聚和较大的恒星质量。我们发现，在局部尺寸较小的环境中，红色和蓝色种群的平均颜色系统地较高，并且在所有亮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亮度中都持续存在，这表明从蓝色到红色星系的转变都可以在所有环境中发生。
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.
