Distribution of black hole masses (M_BH), stellar masses (M_*), and the fraction of AGN emission (f_AGN) of known sources (see text). The left panel compares the lower limit M_BH assuming an Eddington ratio of f_Edd = 1 that we calculated and actual values reported in the literature. The data points are color-coded according to the inferred f_AGN of each source. The middle panel shows the M_* from other studies versus our own measurements. The right panel illustrates the distribution of f_AGN for active and inactive galaxies. To compensate for the difference in sample sizes, we normalize the bin heights of the histogram, ensuring that the integral of the distribution equals unity.