The X-ray emission from active galactic nuclei (AGN) originates very close to the supermassive black hole at the centre of the host galaxy. The emission varies rapidly on timescales of hours and the spectrum reveals signatures of the extreme environment close to the black hole. Narrow-line Seyfert 1 galaxies (NLS1s) provide an enhanced view of the central region in AGN, revealed through reverberation lags, intense Fe La and Fe Ka relativistic emission, dynamic coronae, and ultrafast outflows. I will review recent work on NLS1s, highlighting their most interesting properties, and attempt to describe the NLS1 phenomenon in context of general AGN behavior.
Zoom Recording: https://uky.zoom.us/rec/share/V8qksYxXTxUgTSlXBJaoH-Escvp5ynPz24eEcfq8d2zTvGkFTjBRwAXMK0bAmTVT.Sv2eHYg0U3a1vqfd