Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-27T10:36:14.755Z Has data issue: false hasContentIssue false
  • English
  • Français

About the evolution of Dwarf Spheroidal Galaxies

Published online by Cambridge University Press:  21 April 2007

E. Emsellem ,
H. Wozniak ,
G. Massacrier ,
J.-F. Gonzalez ,
J. Devriendt ,
N. Champavert ,
A. Marcolini ,
A. D'Ercole ,
F. Brighenti  and
S. Recchi
A. Marcolini
Affiliation:
Institute of Astronomy, Vienna University, Türkenschanzstrasse 17, 1180 Vienna, Austria
A. D'Ercole
Affiliation:
INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
F. Brighenti
Affiliation:
Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
S. Recchi
Affiliation:
Institute of Astronomy, Vienna University, Türkenschanzstrasse 17, 1180 Vienna, Austria INAF – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy
Get access

Abstract

We present 3D hydrodynamic simulations aimed at studying the dynamical and chemical evolution of the interstellar medium in dwarf spheroidal galaxies. This evolution is driven by the explosions of type II and type Ia supernovae, whose different contribution is explicitly taken into account in our models. We compare our results with avaiable properties of the Draco galaxy. Despite the huge amount of energy released by SNe explosions, in our model the galaxy is able to retain most of the gas allowing a long period (>3 Gyr) of star formation, consistent with the star formation history derived by observations. The stellar [Fe/H] distribution found in our model matches very well the observed one. The chemical properties of the stars derive from the different temporal evolution between type Ia and type II supernova rate, and from the different mixing of the metals produced by the two types of supernovae. We reproduce successfully the observed [O/Fe]-[Fe/H] diagram.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 24: CRAL-2006. Chemodynamics: From First Stars to Local Galaxies , 2007 , pp. 27 - 32
Copyright
© EAS, EDP Sciences, 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)