About one fifth of all spiral disk galaxies include a ring-shaped pattern in the light
distribution, and an additional one third appear to have broken or partial rings made up of …

I study the flow of gas in and around the bars or ovals of model barred galaxies and show
that it is intimately linked to the properties of the periodic orbits. Simulations show that the …

We report a dynamical determination of the separate contributions of disk and dark halo
masses to the rotation curve of a spiral galaxy. We use fluid-dynamical models of gas flow in …

We perform two-dimensional, time dependent, hydrodynamical simulations of the gas flow in
a potential representing the barred spiral galaxy NGC 1365 using the FS2 code originally …

ABSTRACT Longitude-velocity (lV) diagrams of HI and CO gas in the inner Milky Way have
long been known to be inconsistent with circular motion in an axisymmetric potential …

Recent numerical and analytical results on disc-like accretion with shock waves as the only
dissipation mechanism are compared. The global properties of the process are similar to …

We develop diagnostics based on gas kinematics to identify the presence of a bar in an
edge-on spiral galaxy and determine its orientation. We use position-velocity diagrams …

We investigate stationary gas flows in a fixed, rotating barred potential. The gas is assumed
to be isothermal with an effective sound speed cs, and the equations of motion are solved …

Two-dimensional hydrodynamic calculations of a gas flow in a semi-detached close binary
system with mass ratio unity are carried out again, using a different coordinate system from …

We simulate the flow of gas in the Binney et al. model of the bar at the centre of the Milky
Way. We argue that the flow of a clumpy interstellar medium is most realistically simulated by …