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We investigate the central sub-arcsec region of the low-luminosity activegalactic nucleus NGC 1052, using a high-angular resolution dataset that covers10 orders of magnitude in frequency. This allows us to infer the continuumemission within the innermost $\sim {17}\,$pc around the black hole to be ofnon-thermal, synchrotron origin and to set a limit to the maximum contributionof a standard accretion disc. Assuming the canonical 10 per cent mass-lightconversion efficiency for the standard accretion disc, its inferred accretionpower would be too low by one order of magnitude to account for the observedcontinuum luminosity. We thus introduce a truncated accretion disc and derive atruncation radius to mass-light conversion efficiency relation, which we use toreconcile the inferred accretion power with the continuum luminosity. As aresult we find that a truncated disc providing the necessary accretion powermust be truncated at $r_\text{tr} \gtrsim {26}\, r_\text{g}$, consistent withthe inner radius derived from the observations of the Fe K$\alpha$ line in theX-ray spectrum of this nucleus. This is the first time to derive a limit on thetruncation radius of the accretion disc from high-angular resolution data only.

A lower limit to the accretion disc radius in the low-luminosity AGN NGC 1052 derived from high-angular resolution data