Dust-driven wind from disk galaxies

TL;DR

This paper investigates dust-driven gaseous outflows from disk galaxies, showing their speed is linked to galaxy rotation and star formation, with implications for galaxy evolution.

Contribution

It introduces a model including bulge and dark matter effects, revealing a maximum mass-to-light ratio and a specific wind speed relation independent of free parameters.

Findings

Wind speed is proportional to galaxy rotation speed.

The ratio of wind speed to rotation speed ranges between 2 and 3 after starburst.

Wind speed decays rapidly after about 10 million years.

Abstract

We study gaseous outflows from disc galaxies driven by radiation pressure on dust grains. We include the effect of bulge and dark matter halo and show that the existence of such an outflow implies a maximum value of disc mass-to-light ratio. We show that the terminal wind speed is proportional to the disc rotation speed in the limit of a cold gaseous outflow, and that in general there is a contribution from the gas sound speed. Using the mean opacity of dust grains and the evolution of the luminosity of a simple stellar population, we then show that the ratio of the wind terminal speed ($v_\infty$) to the galaxy rotation speed ($v_c$) ranges between $2 \hbox{--} 3$ for a period of $\sim 10$ Myr after a burst of star formation, after which it rapidly decays. This result is independent of any free parameter and depends only on the luminosity of the stellar population and on the relation between disc and dark matter halo parameters. We briefly discuss the possible implications of our results.