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Using bonafide black hole (BH) mass estimates from reverberation mapping andthe line ratio [Si VI]1.963$\mu$m/Br$\gamma_{\rm broad}$ as tracer of theActive Galactic Nuclei (AGN) ionizing continuum, we find a novel BH-massscaling relation of the form log($M_{\rm BH}) = (6.40\pm 0.17) - (1.99\pm 0.37)\times$ log ([Si VI]/Br$\gamma_{\rm broad})$, over the BH mass interval, $10^6- 10^8$ M$_{\odot}$. The current sample consists of 21 Type-1 AGNs with theoverall dispersion in our scaling relation at 0.47 dex, one that emulates thewell-established M-$\sigma$ relation which shows a dispersion $\sim$0.44 dex.The new scaling offers an economic, and physically motivated alternative for BHestimate using single epoch spectra, avoiding large telescope time(reverberation mapping) or absolute flux calibration (the continuum luminositymethod). With the advent of big surveys in the infrared in the near future, weaim to reduce the scatter in the relation by supplementing with more sources.

A novel black hole mass scaling using coronal lines in active galaxies