Nonlinear Color-Metallicity Relations of Globular Clusters. VIII. Reproducing Color Distributions of Individual Globular Cluster Systems in the Virgo and Fornax Galaxy Clusters

摘要: The color distributions of globular clusters (GCs) in individual early-type galaxies show great diversity their morphology. Based on the conventional "linear" relationship between colors and metallicities GCs, GC metallicity inferred from turn formation histories, should be as diverse they appear. In contrast, here we that an alternative scenario rooted "nonlinear" nature metallicity-to-color transformation points to a simpler more coherent picture. Our simulations for $\sim$80 systems ACS Virgo Fornax Cluster Surveys suggest majority ($\sim$70$\%$) have old ($\sim$13 Gyr) coeval GCs. Their variety distribution morphology stems mainly one parameter, mean system. Furthermore, remaining ($\sim$30$\%$) are also explained by nonlinearity scenario, assuming additional young or intermediate-age GCs with number fraction $\sim$20$\%$ underlying results reinforce explanation bimodality provide new perspective galaxy cluster environment, such clusters.