SUPER STAR CLUSTERS VERSUS OB ASSOCIATIONS

SUPER STAR CLUSTERS VERSUS OB ASSOCIATIONS
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超级明星团与 OB 协会

DOI:
10.1088/0004-637x/724/2/1503
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发表时间:
2010
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
H. Zinnecker
H. Zinnecker
中科院分区:
--
文献类型:
--
作者:
C. Weidner;I. Bonnell;H. Zinnecker

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超级星团(Mecl > 105 M☉)是我们本地宇宙中最大的恒星托儿所,在几光年内包含数十万到数百万颗年轻恒星。许多这样的系统是在外部星系中发现的,尤其是在相互作用的星系对中,以及在一些矮星系中,但在像我们银河系这样的盘状星系中相对较少。我们表明,这种差异的可能解释是正常螺旋星系中剪切的存在,它阻碍了非常大和密集的超级星团的形成,但更倾向于形成松散的OB关联,可能在中心有一个质量较小的星团。相比之下,在相互作用的星系和矮星系中,区域可以在没有大规模旋转的情况下坍缩。由于缺乏旋转支撑,巨大的气体云和恒星聚集成一个单一的、致密的、受引力束缚的系统。
Super star clusters (Mecl > 105 M☉) are the largest stellar nurseries in our local Universe, containing hundreds of thousands to millions of young stars within a few light years. Many of these systems are found in external galaxies, especially in pairs of interacting galaxies, and in some dwarf galaxies, but relatively few in disk galaxies like our own Milky Way. We show that a possible explanation for this difference is the presence of shear in normal spiral galaxies which impedes the formation of the very large and dense super star clusters but prefers the formation of loose OB associations possibly with a less massive cluster at the center. In contrast, in interacting galaxies and in dwarf galaxies, regions can collapse without having a large-scale sense of rotation. This lack of rotational support allows the giant clouds of gas and stars to concentrate into a single, dense, and gravitationally bound system.
30 DORADUS 星暴星团中的低质量初始质量函数
DOI: 10.1088/0004-637x/707/2/1347
发表时间: 2009
期刊: The Astrophysical Journal
影响因子: --
作者:
Andersen M
通讯作者: Andersen M