论文标题
通过充电的粉尘破坏：活性银核的灰色灭绝曲线的可能起源
Dust Destruction by Charging: A Possible Origin of Grey Extinction Curves of Active Galactic Nuclei
论文作者
论文摘要
观察到的活性银河核（AGN）的灭绝曲线与以银河系观察到的显着不同。观察结果需要在AGN环境下优先清除小晶粒。但是，此类物理学尚不清楚。在本文中，我们建议通过充电或库仑爆炸来破坏尘埃，可能是AGN灭绝曲线的原因。严酷的AGN辐射使通过光电发射高度充电的灰尘晶粒，当电荷晶粒的静电拉伸应力超过其拉伸强度时，会通过库仑爆炸发生谷物裂变。我们表明，库仑爆炸可以优先清除小硅酸盐和石墨晶粒，并成功地再现平坦的灭绝曲线和2175Å〜BUMP。
Observed extinction curves of active galactic nuclei (AGNs) are significantly different from those observed in the Milky Way. The observations require preferential removal of small grains at the AGN environment; however, the physics for this remains unclear. In this paper, we propose that dust destruction by charging, or Coulomb explosion, may be responsible for AGN extinction curves. Harsh AGN radiation makes a dust grain highly charged through photoelectric emission, and grain fission via the Coulomb explosion occurs when the electrostatic tensile stress of a charge grain exceeds its tensile strength. We show that the Coulomb explosion can preferentially remove both small silicate and graphite grains and successfully reproduce both flat extinction curves and the absence of 2175Å~bump.
