The investigation of emission line regions within active galaxies (AGNs) has a rich and
extensive history, now extending to the use of AGNs and quasars as “standardizable” …

Context. Dust in active galactic nuclei is clearly present right outside the broad-line region
(BLR) in the form of a dusty molecular torus. However, some models of the BLR predict that …

This paper presents new optical and near-UV spectra of 11 extremely powerful jetted
quasars, with radio to optical flux density ratio> 103, which concomitantly cover the low …

Context. Quasar outflows are key players in the feedback processes that influence the
evolution of galaxies and the intergalactic medium. The chemical abundance of these …

The distinct behaviors of blue-and redshifted broad emission-line shifts, emitted by ionic
species with varying ionization potentials in active galactic nuclei (AGN), can be elucidated …

Aims. We study differences in the physical properties of quasar host galaxies using an
optically selected sample of radio-loud (RL) and radio-quiet quasars (in the redshift range …

Context. The main sequence of quasars has emerged as a powerful tool for organizing the
observational and physical characteristics of type-1 active galactic nuclei (AGNs). Aims. In …

The Main Sequence (MS) of quasars emerged, in the early 2000s, as a powerful tool to
contextualise and organise the observed spectroscopic diversity of the quasars on different …