The book includes a number of new data obtained in recent years, in particular material relating to the recently discovered new structures in spiral galaxies: giant anticyclones, cyclones and slow bars. New methods for the detection of these structures are described. Types of vertical motions of stars and gas in the galaxies, whether due to the presence of spiral arms, or hose instability. An important place is given to modern numerical methods of describing the dynamics of galaxies, stellar as well and gas components.


Algorithms of numerical models and a number of important results are presented. Other topics discussed in the book include: the role of vertical motions in the disk systems and a new twodimensional model of the gas disk, the theory of turbulence; a simple selfconsistent model of the inhomogeneous differentially rotating hot stellar disk of finite thickness; conditions for stability of stellar disks, taking into account the worse stabilizability of nonaxisymmetric disturbances compared to axisymmetric one; technique of construction of numerical dynamical models of gas and collisionless stellar disks; gravitationalhydrodynamic concept of spiral structures; problems in the dynamics of disks taking into account nonlinear factors; a method of reconstruction of the threedimensional velocity field of gas from the observational data; dynamic role of various components: the bulge, bar, halo, spirals; the dynamics of accretion disks; comprehensive analysis of largescale processes in the accretion disk of binary stars, etc.


In this book:


• Observable properties of disc galaxies


• Dynamics of stellar disks


• Main models of the dynamics of galactic gas discs


• Numerical modelling of the galactic discs


• Hydrodynamic instabilities in a rotating disc


• Experiments with modelling of galaxies in Spiral equipment


• Largescale wave galactic structures


• Nonlinear effects in astrophysical discs


• The Galaxy model


• Dark matter inside the galaxies


• Dynamics of accretion discs


About the Authors:


A.M. Fridman was a Russian physicist specializing in astrophysics, physics of gravitating systems and plasma physics. He discovered new types of instabilities in gravitating media, created the theory of planetary rings and predicted the existence of small Uranus satellites that were later discovered. He also developed hydrodynamic theory of the spiral structure in galaxies. Fridman worked at the lnstitute of Astronomy of the Russian Academy of Sciences, and was professor of Moscow Institute of Physics and Technology and Moscow State University. In plasma physics, A.M. Fridman predicted the existence of the Alfven’s solutions, and worked out the stability theory of thermonuclear plasma at finite high pressure. A.M. Fridman discovered new types of nonJeans instabilities in gravitating media, some of which develop at timescales less than Jeans’ timescale, while others exist in systems that are stable according to Jeans


