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We present relations of the black hole mass and the optical luminosity withthe velocity dispersion and the luminosity of the [Ne V] and the [O IV]high-ionization lines in the mid-infrared (MIR) for 28 reverberation-mappedactive galactic nuclei. We used high-resolution Spitzer Infrared Spectrographand Infrared Space Observatory Short Wavelength Spectrometer data to fit theprofiles of these MIR emission lines that originate from the narrow-line regionof the nucleus. We find that the lines are often resolved and that the velocitydispersion of [Ne V] and [O IV] follows a relation similar to that between theblack hole mass and the bulge stellar velocity dispersion found for localgalaxies. The luminosity of the [Ne V] and the [O IV] lines in these sources iscorrelated with that of the optical 5100A continuum and with the black holemass. Our results provide a means to derive black hole properties in varioustypes of active galactic nuclei, including highly obscured systems.

High-ionization mid-infrared lines as black hole mass and bolometric luminosity indicators in active galactic nuclei