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A Model for the Formation of the Milky Way

Published online by Cambridge University Press:  05 March 2013

Markus Samland
Markus Samland*
Affiliation:
Astronomisches Institut der Universität Basel, CH 4102 Binningen, Switzerland
*
2E-mail: samland@astro.unibas.ch
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Abstract

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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.

Keywords

Galaxy: kinematics and dynamicsISM: kinematics and dynamicsGalaxy: evolutionGalaxy: stellar contentGalaxy: formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 2: The Fifth Workshop on Galactic Chemodynamics , 2004 , pp. 175 - 178
Copyright
Copyright © Astronomical Society of Australia 2004

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