来自盘状星系的尘埃驱动风
Dust-driven wind from disk galaxies
摘要：
我们研究尘埃颗粒上的辐射压力驱动的盘状星系的气体外流。我们包括的效果，隆起和暗物质晕，并表明，这样的外流的存在意味着一个最大值的光盘质光比。我们表明，终端风速是成比例的磁盘旋转速度在一个冷的气体流出的限制，并在一般情况下，有一个气体声速的贡献。利用尘埃颗粒的平均不透明度和一个简单的恒星星族的光度的演变，我们然后表明，风终端速度（$v_\infty$）的比率星系旋转速度（$v_c$）的范围之间的$2 \hbox{--} 3$为一个时期的$\sim 10$万年恒星形成后，它迅速衰减。该结果与任何自由参数无关，仅取决于恒星星族的亮度以及盘与暗物质晕参数之间的关系。我们简要地讨论了我们的研究结果的可能影响。
英文摘要：
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.
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