The Formation of Galactic Bulges
The Formation of Galactic Bulges
复制标题
银河核球的形成
DOI：
10.22323/1.014.0060
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
A. Graham
中科院分区：
文献类型：
--
作者：
R. Peletier;M. Balcells;J. Falcón;A. Graham
我们总结了最近关于附近星系凸起的一些结果，这些结果与它们的形成有关。我们重点介绍了我们在理解表面亮度分布、恒星群，特别是螺旋星系的中心方面取得的一些重大进展。我们也把我们自己的银河系看作是一个外部星系。我们的主要结论是，早型旋涡(S0-Sb)的凸起含有中心核成分，就像晚型旋涡和大多数其他类型的星系一样。这些中心成分的光度与总凸起光度的相关性最好，而与形态类型的相关性较差。早期旋涡星系的膨胀遵循椭圆星系的基面和颜色/线强度与光度的关系。虽然我们对早期螺旋线的凸起有一个合理的概念，但我们对晚期螺旋线的凸起知之甚少。然而，我们的银河系凸起与外部盘状星系中的凸起非常相似，这让我们怀疑，晚期螺旋状星系的凸起可能也非常相似。
We summarise some recent results about nearby galactic bulges that are relevant to their formation. We highlight a number of significant advances in our understanding of the surface brightness profiles, stellar populations, and especially the very centers of spiral galaxies. We also view our own Milky Way as if it were an external galaxy. Our main conclusions are that bulges of early-type spirals (S0 -- Sb) contain central nuclear components, just like late-type spirals and most other types of galaxies. The luminosities of these central components correlate best with total bulge luminosity, and not as well with morphological type. Bulges of early-type spiral galaxies follow the fundamental plane and the colour/line strength vs. luminosity relations of elliptical galaxies. Although we have a reasonable idea about bulges of early-type spirals we know much less about late-type bulges. However, the close resemblance of our Milky Way Bulge to bulges in external disk galaxies makes us suspect that bulges of late-type spirals might be very similar as well.