标题： 星系盘加热是否由于球状星团的撞击？ 显示英文标题

标题： Could the Galactic disk heating be due to Globular Cluster impacts?

摘要： 到目前为止，已经提出了六种机制来解释银河盘的加热。其中，最重要的似乎是恒星通过分子云和旋臂的散射的组合。我们研究了另一种机制，即原始银河球状星团群体对盘的反复撞击，直到现在。我们发现，球状星团最多只能为盘的当前垂直能量贡献一小部分，因为它们可以将整个盘加热到{$\sigma $}$_{z}$ = 5.5kms$^{{\rm -} {\rm 1}}$（参见观测值，厚盘和薄盘分别为18和39 kms$^{{\rm -} {\rm 1}}$）。 我们发现盘热的上升率($\alpha$=0.22 在\textit{$\sigma $}$_{z}$ $\sim t^{\alpha}$ 中，\textit t 为时间)，接近于分子云散射所找到的值。 显示英文摘要

摘要： So far, six mechanisms have been proposed to account for the Galactic disk heating. Of these, the most important appear to be a combination of scattering of stars by molecular clouds and by spiral arms. We study a further mechanism, namely, the repeated disk impact of the original Galactic Globular Cluster population up to the present. We find that Globular Clusters could have contributed at most a small fraction of the current vertical energy of the disk, as they could heat the whole disk to {$\sigma $}$_{z}$ = 5.5kms$^{{\rm -} {\rm 1}}$ (c.f. the observed 18 and 39 kms$^{{\rm -} {\rm 1}}$ for the thick and thin disks respectively). We find that the rate of rise of disk heat ($\alpha$=0.22 in \textit{$\sigma $}$_{z}$ $\sim t^{\alpha}$ with \textit t being time), is close to that found for scattering by molecular clouds.