This work represents a development of the study of the collapses of purely self-gravitating systems (see https://physics.aps.org/articles/v12/s19) to the case in which a dissipational gas component is also present. These latter systems show much richer morphological and kinematical structures that may have important observational implications to understand the kinematic and dynamics of the Milky Way as revealed by ongoing surveys such as the Gaia Mission.
by Francesco Sylos Labini, Luis Diego Pinto, Roberto Capuzzo-Dolcetta
Continue reading Formation of disk galaxies with long-lived and non-stationary spiral arms
Here is a gif animated of a simulation with 1 million particles. The initial condition was an isolated, uniform, prolate ellipsoid with a some rigid rotation. The system is evolved for 50 dynamical times. This is a projection on the XY plane where rotation is around the Z axis. The color code is proportional to the log of the density.
More: Long-lived transient structure in collisionless self-gravitating systems David Benhaiem, Francesco Sylos Labini, and Michael Joyce, Phys. Rev. E 99, 022125, 2019