We review the properties of the established Scaling Relations (SRs) of galaxies and active
galactic nuclei (AGN), focusing on their origin and expected evolution back in time, providing …

Type 1 active galactic nuclei display broad emission lines, which are regarded as arising
from photoionized gas moving in the gravitational potential of a supermassive black hole …

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 …

Context. Active galactic nuclei are supermassive black holes surrounded by an accretion
disk, two populations of clouds, bipolar jets, and a dusty torus. The clouds move in Keplerian …

We investigate the dynamics of clumps that coexisted with/in advection-dominated accretion
flows (ADAFs) by considering thermal conductivity. Thermal conduction can be one of the …

The degree of polarization of the radiation in broad emission lines can be used for a unique
determination of the dimensionless radius of the broad line emission region, ie, the ratio of …

We offer a broad review of Balmer line phenomenology in type 1 active galactic nuclei,
briefly summarising luminosity and radio loudness effects, and discussing interpretation in …

Magnetic fields play an important role in confining gas clouds in the broad line region (BLR)
of active galactic nuclei (AGN) and in maintaining the stability of these clouds. Without …

Active galactic nuclei (AGNs) are basically conformed by a supermassive black hole (BH)
surrounded by an accretion disk and a dusty torus (see Sect. 2.2. 2). Some of these objects …

We investigate the orbital motion of cold clouds in the broad-line region of active galactic
nuclei subject to the gravity of a black hole, a force due to a non-isotropic central source, and …