Evolution of disk galaxy as a multifragmented 3D dynamical system embeded in the dark matter halo. Chemical aspect.
Abstract
An effective simple model which consider a disk galaxy as a multifragmented 3D dynamical system compiled in a dark matter potential well is developed. In the frame of this approach the evolving disk galaxy is considered as a three -- component system made of the dark matter halo of total mass 10^12 M_odot with Plummer density profile distribution with 25 kpc scale, rerified hot baryonic halo and fragmented cold baryonic component. The fragmented cold matter is assumed to be locked up in the 2109 particles of total mass 10^11 M_odot initially homogeneously distributed over the shere of radius 50 kpc . Although the chemical evolution of each fragment of is treated in the frame of one - zone model, their dynamical behaviour and, therefore, appropriated star formation history are strongly affected by the gravitational and viscous influence of the surrounding matter. The free model parameters such as a hot baryonic halo total mass 10^11 M_odot and 15 kpc scale were determined via the requirement of close coincidence of model and observational data as well as resemblance with results of detailed SPH simulations.
- Publication:
-
Dynamical Studies of Star Clusters and Galaxies
- Pub Date:
- 1998
- Bibcode:
- 1998dssc.conf..164B