Toroidal/ring structures are a common feature in a wide variety of astrophysical objects,
including dusty tori in active galactic nuclei (AGNs), rings in galaxies, protoplanetary disks …

The recent ALMA maps together with observations of H2O maser emission seem to suggest
the presence of a counter-rotation in the obscuring torus of NGC 1068. We propose to …

Water (mega) masers in AGNs are associated with: i) accretion disks around supermassive
black holes (eg,[1]); ii) radio jets (eg,[2]); iii) nuclear outflows/dusty tori (eg,[3]). Individually …

It is shown that based on the concept of a toroidal self-gravitating ring vortex with a swirl
(with an orbital motion along the torus generatrix), it is possible to explain all the main …

This paper deals with the gravitational potential of a homogeneous torus with elliptical cross-
section. We present a new expression for its gravitational potential which is valid in any point …

H2O masers associated with AGN (the" megamasers") constitute a unique way to directly
map the molecular gas at (sub-) parsec distance from SMBH and, hence, to study the …

The galaxies named Active Galactic Nuclei (AGNs) are characterized by intense emission
observed toward their nuclear regions. Numerous studies carried out over the years have …

The influence of the radiation flux from the accretion disk on obscuring tori in active galactic
nuclei and the inverse effect of torus gravity on the disk and the position of the region of …

Water masers associated with AGNs (the 'megamasers') constitute a unique way to directly
map the molecular gas at (sub-) parsec distance from SMBHs and, hence, to study the …

The discovery of supermassive black holes in the centres of galaxies is one of astronomy's
most important discoveries. In particular, those systems in which matter is accreting onto the …