Preliminary results of the multisite time-series campaign on the sdB pulsator PG 1325+101 |
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| Authors: | R Silvotti A Bonanno A Frasca S Bernabei R Janulis R Østensen S-L Kim B-G Park J Xiaojun J Guo Z Liu MD Reed RS Patterson KM Gietzen PJ Clark GW Wolf Y Lipkin L Formiggini E Leibowitz TD Oswalt M Rudkin K Johnston |
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| Institution: | 1. Astronomisches Institut der Universit?t Basel, Venusstrasse 7, CH-4102, Binningen, Switzerland
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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 3D 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. The feedback of stars leads to turbulent motions and large-scale flows in the ISM. As one result the galactic disk is significantly enriched by chemical elements synthesized in bulge stars. |
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