-s relation between supermassive black holes and the velocity dispersion of globular cluster systems

We find evidence that the mass MBH of central supermassive black holes (SMBHs) correlates with the velocity dispersion sGC of globular cluster systems of their host galaxies. This extends the well-known MBHssph relation between black hole mass and velocity dispersion of the host spheroidal component. We compile published measurements of both MBH and sGC for a sample of 13 systems and find the relation log (MBH) =a+beta log (sGC/200), with a= 8.63 +/- 0.09 and beta= 3.76 +/- 0.52. We also consider blue (metal-poor) and red (metal-rich) globular cluster subpopulations separately and obtain a surprisingly tight correlation using only the velocity dispersion of the red clusters with a= 8.73 +/- 0.09 and beta= 3.84 +/- 0.52 and an intrinsic scatter ?0= 0.22 dex compared to ?0= 0.27 dex for the MBHssph relation of our sample. We use this MBH relation to estimate the central black hole mass in five galaxies for which is measured.