arXiv subjects

Sergei G. Kravchuk

Publications and source records attributed to Sergei G. Kravchuk.

2 recordsLinked to original sources

arXiv1999

A scenario for the formation of dwarf galaxies with an anomally low dark-matter content

The formation and evolution of a low mass galaxy in the gravitational field of a massive disk galaxy (like the Milky Way) has been studied. Numerical simulations of complex gas-dynamic flows are based on our own variant of the Chemo-Dynamical Smoothed Particle Hydrodynamical ({\bf CD-SPH}) approach, which incorporates star formation. The dynamics of the dark matter was treated as a standard N-body problem. It is shown that the satellite galaxy effectively looses its dark matter component due to the strong tidal influence of the massive galaxy, while the gas, owing to its strong dissipative nature, forms an almost dark-matter-free dwarf galaxy.

astro-ph↗

arXiv1998

Galaxy as dissipative N -- body system. Chemical aspect

The evolving galaxy is considered as a system of baryonic fragments embedded into the static dark nonbaryonic (DH) and baryonic (BH) halo and subjected to gravitational and viscous interactions. Though the chemical evolution of each fragment is treated in the frame of one -- zone model with instantaneous recycling, the local gas density and, therefore, its star formation (SF) activity is influenced by other interacting fragments. In spite of its simplicity the model provides a realistic description of the process of galaxy formation and evolution over the Hubble timescale.

astro-ph↗