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Stellar mass black holes and their supermassive counterparts share the same basic physical ingredients
The structure and dynamics of the coupled disc-jet system is invariant under change of mass and/or Eddington scaled accretion rate (= Lbol/eLEdd); unless a global accretion mode change takes place (see Heinz & Sunyaev 2003).
We build a sample with the largest possible dynamical range in both mass and accretion rate (we consider GBH and SMBH as members of the same class)
We consider compact synchrotron emission in the radio band as proxy for jet activity and hard X-rays to probe accretion states
The sample consists of active BH with measured mass (making use of primary, secondary and tertiary indicators), 5 GHz core radio luminosity and hard (2-10 keV) X-ray luminosity