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The NuSTAR observatory, with its high sensitivity in hard X-rays, has enableddetailed broadband modeling of the X-ray spectra of Active Galactic Nuclei(AGN), thereby allowing constraints to be placed on the high-energy cutoff ofthe X-ray coronal continuum. We investigate the spectral properties of a sampleof 46 NuSTAR-observed Seyfert 1 AGN selected from the Swift/BAT 70-month hardX-ray survey. Our measurements of the high-energy cutoff of the continuum frommodeling the NuSTAR X-ray spectra are used to map out the temperature -compactness ($\theta-l$) plane for AGN coronae. We find that most of thecoronae lie clustered near the boundary for runaway pair production, suggestingthat annihilation and pair production act to regulate the temperature of thecorona. We discuss the implications of coronae whose high-energy cutoff mayindicate a low coronal temperature on the heating and thermalization mechanismsin the corona.

Coronal properties of Swift/BAT-selected Seyfert 1 AGN observed with NuSTAR