Coronal Properties of Swift/BAT-Selected Seyfert 1 AGN observed with NuSTAR

The continuum X-ray emission from Active Galactic Nuclei (AGN) is believed to originate in a hot, compact corona located above the accretion disk. Compton upscattering of UV photons from the inner accretion disk by coronal electrons produces a power law X-ray continuum with a cutoff at energies determined by the electron temperature. The NuSTAR observatory, with its high sensitivity in hard X-rays, has enabled detailed broadband modeling of the X-ray spectra of AGN, thereby allowing tight constraints to be placed on the high-energy cutoff of the X-ray continuum. Recent detections of low cutoff energies in Seyfert 1 AGN in the NuSTAR band have motivated us to pursue a systematic search for low cutoff candidates in Swift/BAT-detected Seyfert 1 AGN that have been observed with NuSTAR. We use our constraints on the cutoff energy to map out the location of these sources on the compactness - temperature diagram for AGN coronae, and discuss the implications of coronae whose high-energy cutoff may indicate a low coronal temperature on the cooling and thermalization mechanisms in the corona.