A Model for the Formation of the Milky Way

Publications of the Astronomical Society of Australia

Markus Samland¹ 

关键词: Galaxy: kinematics and dynamics;    ISM: kinematics and dynamics;    Galaxy: evolution;    Galaxy: stellar content;    Galaxy: formation;   

DOI  :  10.1071/AS04009

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

A new chemodynamical model for the formation and evolution of a Milky Way type galaxy is introduced. In this scenario, the galaxy forms inside a slowly growing dark matter halo in a ΛCDM cosmology. In contrast to the simple merger and collapse scenarios, the galactic mass grows continuously over a Hubble time. The whole formation scenario is simulated with a three-dimensional chemodynamical code. Within this model it is possible to follow the evolution of the galactic substructure in detail. The structure of the galactic components — halo, bulge, and disk — and the kinematical and chemical signatures of the stellar populations in the model are in excellent agreement with data from the Milky Way. The present model provides a detailed formation scenario for the Milky Way Galaxy and it yields new information about its kinematical and chemical history. The model predicts that even galaxies like the Milky Way show phases with supernova-driven galactic winds. However, with a mass loss of the order of only a few per cent of the total baryonic mass, these galaxies are in all probability not the main contributors to the enrichment of the intergalactic medium.

【 授权许可】

Unknown