L. Di Gesu

TL;DR: A multiwavelength monitoring campaign throughout 2013 suggests that an additional faster jet component has been launching clumps of gas that obscure both the x-ray and UV radiation in NGC 5548, and suggests that the outflow could be associated with a wind from the supermassive black hole's accretion disk.

TL;DR: In this article, an extensive multi-satellite campaign on NGC 5548 has revealed this archetypal Seyfert-1 galaxy to be in an exceptional state of persistent heavy absorption.

TL;DR: In this article, a simple model based on a fixed total column-density absorber, reacting to changes in ionizing illumination, matches the very different ionization states seen in five spectroscopic epochs spanning 16 years and yields the first simple model that can explain the physical characteristics and the substantial variability observed in an AGN outflow.

TL;DR: In this paper, a simple model based on a fixed total column-density absorber, reacting to changes in ionizing illumination, matches the very different ionization states seen in five spectroscopic epochs spanning 16 years.

TL;DR: In this article, a Swift monitoring program was carried out to track the X-ray hardness variability of eight type-I AGN over a year, and the purpose of this monitoring was to find intense obscuration events in AGN, and thereby study them by triggering joint XMM-Newton, NuSTAR, and HST observations.