DUST-DRIVEN WIND FROM DISK GALAXIES
Mahavir Sharma, Biman B. Nath, Yuri Shchekinov
2011
Astrophysical Journal Letters
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
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... osity of a simple stellar population, we then show that the ratio of the wind terminal speed (v_∞) to the galaxy rotation speed (v_c) ranges between 2 -- 3 for a period of ∼ 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.
doi:10.1088/2041-8205/736/2/l27
fatcat:iidsul4e2jcqpiolusohqly6jy