星际空间临界电离速度效应的作用及氦原子的导出丰度
The Role of the Critical Ionization Velocity Effect in Interstellar Space and the Derived Abundance of Helium
摘要：
高斯分析新的，高角分辨率的星际21厘米中性氢的发射轮廓结构更清楚地揭示了存在以前报道的签名的临界电离速度（{ \it CIV}）的氦（34公里秒$^{-1}$）。目前的分析包括1496个组成部分的线宽为178中性氢配置文件在两个地区的天空在银河纬度周围的$-$ 50 $^\circ$，远离银道面。这里考虑的新数据允许计算氦的星际丰度，并且导出的0.095 $\pm$ 0.020的值与基于太阳数据的宇宙丰度的0.085的值非常好地比较。虽然在星际空间中引起{ \it CIV}效应的确切机制还不清楚，但我们的研究结果可能为进一步理论研究该机制如何运作提供额外的动力。
英文摘要：
Gaussian analysis of new, high-angular-resolution interstellar 21-cm neutral hydrogen emission profile structure more clearly reveals the presence of the previously reported signature of the critical ionization velocity ({\it CIV}) of Helium (34 km s$^{-1}$). The present analysis includes 1496 component line widths for 178 neutral hydrogen profiles in two areas of sky at galactic latitudes around $-$50$^\circ$, well away from the galactic plane. The new data considered here allow the interstellar abundance of Helium to be calculated, and the derived value of 0.095 $\pm$ 0.020 compares extremely well with the value of 0.085 for the cosmic abundance based on solar data. Although the precise mechanisms that give rise to the {\it CIV} effect in interstellar space are not yet understood, our results may provide additional motivation for further theoretical study of how the mechanism operates.
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