Chemodynamical gas flow cycles and their influence on the chemical evolution of dwarf irregular galaxies

Autor(en)

Andreas Rieschick, Gerhard Hensler

Abstrakt

Here we investigate an exemplary chemodynamical evolutionary simulation of a dwarf irregular galaxy. By means of this model we demonstrate the existence of three gas mixing cycles: 1) An inner "local cycle" mixing the metals produced in stars locally, and 2) an outer "galactic cycle" on which hot gas is driven out of the galaxy by multiple supernovae type II and mixes on a short timescale with the available cold gas. 3) Only a small fraction of the metals leaves the galactic gravitational field and follows the "global cycle" with the intergalactic matter. The large-scale mixing results in a temporary depletion of supernova ejected metals. We will discuss this "delayed recycling" and its influence on the chemical evolution, especially on the nitrogen over oxygen ratio which is increased temporarily. These results presented her are also relevant for less sophisticated analytical approaches and chemical evolutionary models of galaxies which have to parameterize the metal loss through outflow.

Organisation(en)

Institut für Astrophysik

Journal

Astrophysics and Space Science

Band

284

DOI

https://doi.org/10.1023/A:1024081708806

Publikationsdatum

02-2003

Peer-reviewed

Ja

ÖFOS 2012

103004 Astrophysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5830ddef-8a92-4509-92c3-a86eb35956fa