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By their star content, the galaxies split out into a red and a bluepopulation; their color index peaked around u-r=2.5 or u-r=1, respectively,quantifies the ratio of the blue stars newly formed from cold galactic gas, tothe redder ones left over by past generations. On the other hand, uponaccreting substantial gas amounts the central massive black holes energizeactive galactic nuclei (AGNs); here we investigate whether these show asimilar, and possibly related, bimodal partition as for current accretionactivity relative to the past. To this aim we use an updated semianalyticmodel; based on Monte Carlo simulations, this follows with a large statisticsthe galaxy assemblage, the star generations and the black hole accretions inthe cosmological framework over the redshift span from z=10 to z=0. We test oursimulations for yielding in close detail the observed split of galaxies into ared, early and a blue, late population. We find that the black hole accretionactivities likewise give rise to two source populations: early, bright quasarsand later, dimmer AGNs. We predict for their Eddington parameter $\lambda_E$ --the ratio of the current to the past black hole accretions -- a bimodaldistribution; the two branches sit now under $\lambda_E \approx 0.01$ (mainlycontributed by low-luminosity AGNs) and around $\lambda_E \approx 0.3-1$. Thesenot only mark out the two populations of AGNs, but also will turn out tocorrelate strongly with the red or blue color of their host galaxies.

Bimodal AGNs in Bimodal Galaxies