期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 397, 期 3, 页码 1587-1590出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15044.x
关键词
Galaxy: disc; globular clusters: general
资金
- STFC
- Science and Technology Facilities Council [PP/E001173/1] Funding Source: researchfish
- STFC [PP/E001173/1] Funding Source: UKRI
So far, six mechanisms have been proposed to account for the Galactic disc 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 disc 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 disc, as they could heat the whole disc to Sigma(z) = 5.5 km s(-1) (c.f. the observed 18 and 39 km s(-1) for the thick and thin discs, respectively). We find that the rate of rise of disc heat (alpha = 0.22 in Sigma(z) similar to t(alpha) with t being time) is close to that found for scattering by molecular clouds.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据