The central engines of active galactic nuclei (AGNs) are powered by accreting supermassive
black holes, and while AGNs are known to play an important role in galaxy evolution, the key …

We present the first results from the ongoing, intensive, multiwavelength monitoring program
of the luminous Seyfert 1 galaxy Mrk 817. While this active galactic nucleus was, in part …

Context. The changing-look phenomenon observed in a growing number of active galaxies
challenges our understanding of the accretion process close to a black hole. Aims. We …

The Seyfert 1 galaxy NGC 4593 was monitored spectroscopically with the Hubble Space
Telescope as part of a reverberation mapping campaign that also included Swift, Kepler …

Thermal reverberation in accretion discs of active galactic nuclei is thought to be the reason
of the continuum UV/optical time lags seen in these sources. Recently, we studied thermal …

We investigate the contribution of reprocessed continuum emission (1000–10 000 Å)
originating in broad-line region (BLR) gas, the diffuse continuum (DC), to the wavelength …

We present the first results from a reverberation-mapping campaign undertaken during the
first half of 2012, with additional data on one active galactic nucleus (AGN)(NGC 3227) from …

In this contribution, we achieve the primary goal of the active galactic nucleus (AGN) STORM
campaign by recovering velocity–delay maps for the prominent broad emission lines (Lyα, C …

Active galactic nuclei (AGNs) have long been observed to" twinkle"(ie, their brightness
varies with time) on timescales from days to years in the UV/optical bands. Such AGN …

Abstract The 180 day Space Telescope and Optical Reverberation Mapping campaign on
NGC 5548 discovered an anomalous period, the broad-line region (BLR) holiday, in which …