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The role of stellar feedback in the formation of galactic disks and bulges in a ΛCDM Universe

Published online by Cambridge University Press:  01 July 2007

Daniel Ceverino  and
Anatoly Klypin
Daniel Ceverino
Affiliation:
Astronomy Department, New Mexico State University, Las Cruces, NM, USA
Anatoly Klypin
Affiliation:
Astronomy Department, New Mexico State University, Las Cruces, NM, USA
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Abstract

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Although supernova explosions and stellar winds happens at scales bellow 100 pc, they affect the interstellar medium (ISM) and galaxy formation. We use cosmological N-body+Hydrodynamics simulations of galaxy formation, as well as simulations of the ISM to study the effect of stellar feedback on galactic scales. Stellar feedback maintains gas with temperatures above a million degrees. This gas fills bubbles, super-bubbles and chimneys. Our model of feedback, in which 10%–30% of the feedback energy is coming from runaway stars, reproduces this hot gas only if the resolution is better than 50 pc. This is 10 times better than the typical resolution in cosmological simulations of galaxy formation. Only with this resolution, the effect of stellar feedback in galaxy formation is resolved without any assumption about sub-resolution physics. Stellar feedback can regulate the formation of bulges and can shape the inner parts of the rotation curve.

Keywords

hydrodynamicsmethods: numericalgalaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 33 - 34
Copyright
Copyright © International Astronomical Union 2008

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