Outflows from active galactic nuclei (AGNs) are one of the fundamental mechanisms by
which the central supermassive black hole interacts with its host galaxy. Detected in≥ 50 …

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 …

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 …

As a natural consequence of cosmological hierarchical structure formation, sub-parsec
supermassive black hole binaries (SMBHBs) should be common in galaxies but thus far …

The Seyfert-1 galaxy NGC 3516 has undergone major spectral changes in recent years. In
2017 we obtained Chandra, NuSTAR, and Swift observations during its new low-flux state …

The most robust way for determining the distance of quasar absorption outflows is the use of
troughs from ionic excited states. The column density ratio between the excited and …

We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the
Seyfert 1 galaxy NGC 5548. This includes 12 years of new unpublished observations (2003 …

Although now routinely incorporated into hydrodynamic simulations of galaxy evolution, the
true importance of the feedback effect of the outflows driven by active galactic nuclei (AGNs) …

Outflows in active galactic nuclei (AGN) are considered a promising candidate for driving
AGN feedback at large scales. However, without information on the density of these outflows …

We report on a remarkable change in the spectral energy distribution (SED) of Mrk 841,
providing new insights on how the soft X-ray excess emission in active galactic nuclei …