A correlation between supermassive black hole mass and galaxy light concentration

The varying global distribution of stars, or specifically, their concentration Cr_e, within elliptical galaxies and spiral galaxy bulges is intimately related to the mass of their central supermassive black holes (Mbh), such that log (Mbh/Msun) = 6.81(±0.95)Cr_e + 5.03±0.41. This correlation has a Spearman correlation coefficient rs=0.91, and a scatter of only 0.31 dex in log Mbh. Removing one well understood outlying data point and using only those galaxies whose supermassive black hole's radius of influence has been resolved (reducing the sample size from 21 to 13) results in a scatter of only 0.19 dex.