Temperature relaxation in supernova remnants, revisited
Temperature relaxation in supernova remnants, revisited
复制标题
重新审视超新星遗迹中的温度弛豫
DOI：
10.1086/162535
复制
发表时间：
1984
期刊：
影响因子：
--
通讯作者：
H. Itoh
中科院分区：
文献类型：
--
作者：
H. Itoh
一些超新星遗迹正在向部分中性介质膨胀。被快速冲击波吞没的中性原子被碰撞电离，射出低能二次电子。假设二次电子、冲击电子和离子具有麦克斯韦速度分布，通过库仑碰撞计算了温度弛豫。将结果应用于自相似爆炸波。如果在像第谷这样的年轻残骸中，激波前沿的无碰撞电子加热效率很高，那么二次电子可能比受冲击的电子和离子都要冷得多。在这种情况下，出射的X射线连续谱将具有双温或幂律的外观。这种效应可能已经在SN 1006残留物的明亮边缘观察到。
Some supernova remnants are expanding into a partially neutral medium. The neutral atoms which are engulfed by the fast blast shock are collisionally ionized to eject low-energy secondary electrons. Calculations are conducted of the temperature relaxation through Coulomb collisions among the secondary electrons, the shocked electrons, and the ions, assuming that the three species have Maxwellian velocity distributions. The results are applied to a self-similar blast wave. If the efficiency of collisionless electron heating at the shock front is high in young remnants such as Tycho, the secondary electrons may be much cooler than both the shocked electrons and the ions. In this case, the emergent X-ray continuum spectrum will have a two-temperature, or a power-law, appearance. This effect may have been observed in the bright rim of the remnant of SN 1006.