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We use new X-ray data obtained with the Nuclear Spectroscopic Telescope Array(NuSTAR), near-infrared (NIR) fluxes, and mid-infrared (MIR) spectra of asample of 24 unobscured type 1 active galactic nuclei (AGN) to study thecorrelation between various hard X-ray bands between 3 and 80 keV and theinfrared (IR) emission. The IR to X-ray correlation spectrum (IRXCS) shows amaximum at ~15-20 micron, coincident with the peak of the AGN contribution tothe MIR spectra of the majority of the sample. There is also a NIR correlationpeak at ~2 micron, which we associate with the NIR bump observed in some type 1AGN at ~1-5 micron and is likely produced by nuclear hot dust emission. TheIRXCS shows practically the same behaviour in all the X-ray bands considered,indicating a common origin for all of them. We finally evaluated correlationsbetween the X-ray luminosities and various MIR emission lines. All the linesshow a good correlation with the hard X-rays (rho>0.7), but we do not find theexpected correlation between their ionization potentials and the strength ofthe IRXCS.

The infrared to X-ray correlation spectra of unobscured type 1 active galactic nuclei