NICER observation list: Target ID 363101

Quasi-periodic oscillations (QPOs) are potentially valuable tools for studying accretion disks, general relativity, and the environments around black holes. Despite proliferating theories, however, their physical origin is still unknown. Although common in the X-ray light curves of stellar mass black holes, only a handful have been observed in AGN. Bolstered by the discovery of an optical QPO in a Kepler AGN light curve, we have obtained TESS short-cadence monitoring for two AGN with known powerful X-ray QPOs. In this proposal, we request NICER monitoring of one of these AGN to occur simultaneously with TESS, to provide vital complementary insights into the nature of the quasiperiodic phenomenon and causality in the AGN central engine.