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--- courses:ast403:galaxy-luminosity-function [2026/02/14 06:45] – shuvo
+++ courses:ast403:galaxy-luminosity-function [2026/02/14 06:47] (current) – shuvo
@@ Line 34: / Line 34: @@
 **Color Bimodality:** The galaxy population exhibits a bimodal distribution in color-magnitude space. Red sequence galaxies (older, early-type) dominate at high luminosities, while the blue cloud (star-forming, late-type) dominates at lower luminosities.
-{{ :courses:ast403:galaxy_color.jpg?600 |Fig2:  }}
+[{{ :courses:ast403:galaxy_color.jpg?600 |Fig2: The density of galaxies in color–magnitude space.The color of ∼ 70 000 galaxies with redshifts $0.01 \le z \le 0.08$ from the Sloan Digital Sky Survey is measured by the rest-frame $u−r$, i.e., after a (small) correction for their redshift was applied.}}]
 **Environmental Dependence:** In rich clusters, the luminosity function is dominated at the bright end by ellipticals and S0 galaxies, and at the faint end by dwarf ellipticals ($dE$). Clusters often contain a cD galaxy at the center that is significantly brighter than the Schechter $L^*$ predicts, representing a "light excess" at large radii.