The concept of the quasar main sequence is very attractive since it stresses correlations
between various parameters and implies the underlying simplicity. In the optical plane …

Abstract Broad Emission Lines are the most characteristic features of Active Galaxies, but
the mechanism of creating a medium able to emit these intense lines is not quite clear …

We present the results from a spectroscopic monitoring campaign to obtain reverberation
mapping measurements and investigate the broad-line region (BLR) kinematics for active …

Context. Broad emission lines are the most characteristic features in the spectra of galaxies
with an active galactic nucleus (AGN). They mostly show either single-peaked or double …

The dynamics of the broad line region (BLR) in active galaxies is an open question; direct
observational constraints suggest a predominantly Keplerian motion, with possible traces of …

NGC 5548 is one of the active galactic nuclei (AGNs) selected for our long-term
spectroscopic monitoring with the Lijiang 2.4 m telescope, aiming at investigating the origin …

Aims. Characterisation of the long-term variations in the broad line region in a luminous
blazar, where Comptonisation of broad-line emission within a relativistic jet is the standard …

The origin of the low-ionization nuclear emission-line region (LINER) prevalent in local
galaxies and its relationship with supermassive black holes have been debated for decades …

Active galactic nuclei (AGN) feedback and its impact on their host galaxies are critical to our
understanding of galaxy evolution. Here, we present a combined analysis of new high …

The origin of the broad-line region (BLR) clouds in active galactic nuclei is still under
discussion. We develop a scenario in which the clouds in the outer, less ionized part of the …