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Over the last decade, the evidence is mounting that several aspects of blackhole accretion physics proceed in a mass-invariant way. One of the bestexamples of this scaling is the empirical "Fundamental Plane of Black HoleAccretion" relation linking mass, radio and X-ray luminosity over eight ordersof magnitude in black hole mass. The currently favored theoreticalinterpretation of this relation is that the physics governing power output inweakly accreting black holes depends more on relative accretion rate than onmass. In order to test this theory, we explore whether a mass-invariantapproach can simultaneously explain the broadband spectral energy distributionsfrom two black holes at opposite ends of the mass scale but at similarEddington accretion fractions. We find that the same model, with the same valueof several fitted physical parameters expressed in mass-scaling units toenforce self-similarity, can provide a good description of two datasets fromV404 Cyg and M81*, a stellar and supermassive black hole, respectively.Furthermore, only one of several potential emission scenarios for the X-rayband is successful, suggesting it is the dominant process driving theFundamental Plane relation at this accretion rate. This approach thus holdspromise for breaking current degeneracies in the interpretation of black holehigh-energy spectra, and for constructing better prescriptions of black holeaccretion for use in various local and cosmological feedback applications.

As above, so below: exploiting mass scaling in black hole accretion to break degeneracies in spectral interpretation