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The Sweeping-out of Dust by Radiation Pressure of Stars and Chemical Composition Peculiarities of Disc Galaxies
Astronomy Reports ( IF 1 ) Pub Date : 2021-05-17 , DOI: 10.1134/s1063772921050061
E. E. Sivkova , D. S. Wiebe , B. M. Shustov

Abstract—

We consider the drift of dust grains of various sizes and chemical compositions caused by the stellar radiation pressure in the vicinity of the Milky Way. When integrating the equations of motion, in addition to the radiation pressure, we consider the gravitational attraction from various components of the Galaxy and the gas drag. It has been shown that carbonaceous grains of medium sizes (~0.01 μm) are swept out of the galactic disc most effectively. Smaller dust grains are swept out to a substantially lesser extent, or they are not swept out at all. We also consider the motion of silicate dust grains, including those with porous structure. It has been shown that silicate grains experience a considerably weaker impact of the radiation pressure. The simulation result of their motion does not essentially depend on whether their porosity is accounted for or ignored. The total rate of the Galaxy’s dust loss has turned out to be high—approximately 0.03 M per year, which is comparable to the effect produced by the other mechanisms ejecting heavy elements to the circumgalactic space. We discuss the potential of the sweeping of dust out of the Galaxy in formation of the radial metallicity gradient, as well as the prospects of detecting extensive dust structures in elliptical galaxies.



中文翻译:

恒星辐射压和盘状星系化学成分特征清除尘埃

摘要-

我们考虑了银河系附近恒星辐射压力引起的各种尺寸和化学成分的尘埃颗粒漂移。在对运动方程进行积分时,除了辐射压力之外,我们还考虑了来自银河系各个组成部分的重力引力和气体阻力。研究表明,中等大小(〜0.01μm)的碳质颗粒最有效地从银河系盘片中清除了。较小的灰尘颗粒被清除的程度要小得多,或者根本不会被清除。我们还考虑了硅酸盐尘埃颗粒的运动,包括具有多孔结构的尘埃颗粒。已经表明,硅酸盐颗粒受到辐射压力的影响要弱得多。它们运动的模拟结果基本上不取决于是考虑还是忽略了它们的孔隙率。事实证明,银河尘埃的总流失率很高,约为0.03 中号每年,这与由其他机制喷射重元素到circumgalactic空间所产生的效果。我们讨论了在形成径向金属梯度时尘埃从银河中清除的可能性,以及探测椭圆星系中广泛的尘埃结构的前景。

更新日期:2021-05-17
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