2003/02/19 by Andreas Rieschick, G. Hensler, Gerhard Hensler · 1 citation
Physics and Astronomy · #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1023/a:1024081708806
published as Astrophys.SpaceSci.284:861-864,2003 · 4 pages, 1 figure, to appear in Proceedings of "The Evolution of Galaxies - III. From simple approaches to self-consistent models", eds. G. Hensler et al., Kluwer Publ., Dordrecht
arxiv created 2003/02/19 · openalex publication_date 2003/04/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.