A novel black-hole mass scaling relation based on coronal gas, and its dependence with the accretion disc

Abstract

Using bona-fide black hole (BH) mass estimates from reverberation mapping and the line ratio [SiVI] 1.963$\mu$m/Br${\gamma }_{\mathrm{broad}}$ as tracer of the AGN ionising continuum, a novel BH-mass scaling relation of the form log($M_{\mathrm{BH}})=(6.40\pm 0.17)-(1.99\pm 0.37)\times$ log ([SiVI]/Br${\gamma }_{\mathrm{broad}})$, dispersion 0.47 dex, over the BH mass interval, $10^6-10^8$ M${}_{\odot }$ is found. Following on the geometrically thin accretion disc approximation and after surveying a basic parameter space for coronal lines production, we believe one of main drivers of the relation is the effective temperature of the disc, which is effectively sampled by the [SiVI] 1.963$\mu$m coronal line for the range of BH masses considered. By means of CLOUDY photoionisation models, the observed anti-correlation appears to be formally in line with the thin disc prediction T_disc $\propto {M_{\mathrm{BH}}}^{-1/4}$.

22 pages, 16 figures. Accepted for publication in MNRAS. arXiv admin note: text overlap with arXiv:2010.00075

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