arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1502.03151astro-ph.GA
收藏

Milky Way磁盘

The Milky Way disk

Giovanni Carraro

摘要:

这篇评论总结了我在银河系光盘上的特邀演讲。其背后的想法是触及那些可以被认为是当今银河系盘研究中的热门话题:厚盘的现实,银河系的螺旋结构,以及外银河系盘的性质。近年来,在这些主题上做了大量工作,但仍然缺乏一个连贯和清晰的画面。详细的研究与高质量的光谱数据似乎支持一个双星系盘,有一个明确的分离成薄和厚的组成部分。关于银河系的螺旋结构,仍然存在许多混乱和非常不一致的想法。我们在圆盘中的位置使我们无法观察它,我们只能推断它,这个推断过程还远未成熟,在很大程度上取决于所选择的示踪剂,所采用的模型及其局限性,在许多情况下,这些都没有得到适当的解释,也没有得到足够的思考。最后,关于银河系盘的大小(尺度长度,截断半径),以及对观测到的外盘恒星星族的解释,无论是外部实体(麒麟座,三角座-仙女座,大犬座)还是真正的盘属性的表现(例如,Warp和Flare)。

英文摘要:

This review summarises the invited presentation I gave on the Milky Way disc. The idea underneath was to touch those topics that can be considered hot nowadays in the Galactic disk research: the reality of the thick disk, the spiral structure of the Milky Way, and the properties of the outer Galactic disk. A lot of work has been done in recent years on these topics, but a coherent and clear picture is still missing. Detailed studies with high quality spectroscopic data seem to support a dual Galactic disk, with a clear separation into a thin and a thick component. Much confusion and very discrepant ideas still exist concerning the spiral structure of the Milky Way. Our location in the disk makes it impossible to observe it, and we can only infer it. This process of inference is still far from being mature, and depends a lot on the selected tracers, the adopted models and their limitations, which in many cases are neither properly accounted for, nor pondered enough. Finally, there are very different opinions on the size (scale length, truncation radius) of the Galactic disk, and on the interpretation of the observed outer disk stellar populations in terms either of external entities (Monoceros, Triangulus-Andromeda, Canis Major), or as manifestations of genuine disk properties (e.g., warp and flare).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑