Simulation of radiation driven wind from disc galaxies

Details Simulation of radiation driven wind from disc galaxies Simulation of radiation driven wind from disc galaxies

2012-04-05

arxiv.org/abs/1204.1133v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

10 pages, 11 figures, Accepted for publication in MNRAS

Scientific paper

We present 2-D hydrodynamic simulation of rotating galactic winds driven by radiation. We study the structure and dynamics of the cool and/or warm component($T \simeq 10^4$ K) which is mixed with dust. We have taken into account the total gravity of a galactic system that consists of a disc, a bulge and a dark matter halo. We find that the combined effect of gravity and radiation pressure from a realistic disc drives the gas away to a distance of $\sim 5$ kpc in $\sim 37$ Myr for typical galactic parameters. The outflow speed increases rapidly with the disc Eddington parameter $\Gamma_0(=\kappa I/(2 c G \Sigma)$) for $\Gamma_0 \ge 1.5$. We find that the rotation speed of the outflowing gas is $\lesssim 100$ km s$^{-1}$. The wind is confined in a cone which mostly consist of low angular momentum gas lifted from the central region.

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