The chemo-dynamical evolution of a disk galaxy

Author: Samland, M.

Source: Astrophysics and Space Science, Volume 284, Number 2, 2003 , pp. 841-844(4)

Publisher: Springer

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Abstract:



I present a model for the formation and evolution of a massive disk galaxy, within a growing dark halo whose mass evolves according to cosmological simulations of structure formation. The galactic evolution is simulated with a new three-dimensional chemo-dynamical code, including dark matter, stars and a multi-phase ISM. We follow the evolution from redshift z = 4.85 until the present epoch. The energy release by massive stars and supernovae prevents a rapid collapse of the baryonic matter and delays the maximum star formation until redshift z ≈ 1. The galaxy forms radially from inside-out and vertically from top-to-bottom. Correspondingly, the inner halo is the oldest component, followed by the outer halo, the bar/bulge, the thick and the thin disk. The bulge in the model consists of at least two stellar subpopulations, an early collapse population and a population that formed later in the bar.

Keywords: Galaxies: formation; ISM; evolution; kinematics and dynamics; stellar content; structure

Document Type: Research Article

Affiliations: Astronomisches Institut der Universit├Ąt Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland E-mail: samland@astro.unibas.ch

Publication date: January 1, 2003

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