Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-18
Mon.Not.Roy.Astron.Soc.387:1431,2008
Astronomy and Astrophysics
Astrophysics
15 pages, 11 figures, accepted for publication in MNRAS. Added 4 new figures and made minor textual changes. Simulation videos
Scientific paper
10.1111/j.1365-2966.2008.13322.x
Feedback from star formation is thought to play a key role in the formation and evolution of galaxies, but its implementation in cosmological simulations is currently hampered by a lack of numerical resolution. We present and test a sub-grid recipe to model feedback from massive stars in cosmological smoothed particle hydrodynamics simulations. The energy is distributed in kinetic form among the gas particles surrounding recently formed stars. The impact of the feedback is studied using a suite of high-resolution simulations of isolated disc galaxies embedded in dark halos with total mass 10^{10} and 10^{12} Msol/h. We focus in particular on the effect of pressure forces on wind particles within the disc, which we turn off temporarily in some of our runs to mimic a recipe that has been widely used in the literature. We find that this popular recipe gives dramatically different results because (ram) pressure forces on expanding superbubbles determine both the structure of the disc and the development of large-scale outflows. Pressure forces exerted by expanding superbubbles puff up the disc, giving the dwarf galaxy an irregular morphology and creating a galactic fountain in the massive galaxy. Hydrodynamic drag within the disc results in a strong increase of the effective mass loading of the wind for the dwarf galaxy, but quenches much of the outflow in the case of the high-mass galaxy.
Dalla Vecchia Claudio
Schaye Joop
No associations
LandOfFree
Simulating galactic outflows with kinetic supernova feedback does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simulating galactic outflows with kinetic supernova feedback, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simulating galactic outflows with kinetic supernova feedback will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-690171