The AGN Corona and Supermassive Black Hole of NGC 4151 as Revealed by NuSTAR and Suzaku

Through timing and spectral analyses of simultaneous, 150 ks Nuclear Spectroscopic Telescope Array (NuSTAR) and Suzaku X-ray observations of the Seyfert 1.5 galaxy NGC 4151, we disentangle the continuum, reflection, and absorption properties of the innermost regions of the active galactic nucleus (AGN). Utilizing NuSTAR's broadband (3-79 keV) X-ray sensitivity and Suzaku's CCD energy resolution from 0.7-10 keV, we robustly determine properties of the AGN corona and supermassive black hole (SMBH). We constrain the coronal temperature and optical depth to be kT_e = 44_-29⁺⁹ keV and τ=1.4_-0.3^+2.0, respectively, assuming a coronal slab geometry. Additionally, we determine the dimensionless spin, a≥0.99, of the SMBH in NGC 4151 for the first time through a spectral analysis. Finally, we show evidence that the coronal flux varies on time-scales as short as four hours. We discuss constraints our results put on the coronal geometry. To robustly test for the presence of relativistic reflection from the inner accretion disks of Seyfert 1 AGNs, we develop a library of time-dependent spectra and light curves from simulated eclipses of an accretion disk by clumpy, absorbing material covering a large range of disk, black hole, and absorber parameters. When applied to a high signal-to-noise observation of a Compton-thick eclipse of the accretion disk, these simulations will enable observational tests for the presence of inner accretion disk reflection in Seyfert 1 AGN emission using current X-ray observatories and standard X-ray data analysis software.