Galaxies appear simpler than expected-猫眼课题宝

DOI：

10.1038/nature07366

发表时间：

2008-10

期刊：

Nature

影响因子：

64.8

通讯作者：

中科院分区：

综合性期刊1区

文献类型：

作者：

M. Disney;J. D. D. Romano-J.-D.-D.-Romano-2287019984;J. D. D. Romano-J.-D.-D.-Romano-2287019984;D. Garcia-Appadoo;D. Garcia-Appadoo;Andrew A. West;Andrew A. West;Julianne J. Dalcanton;Luca Cortese

星系是一个复杂的系统，它的演化是动力学、星星形成、化学富集以及超新星爆炸和超大质量黑洞反馈相互作用的结果。星系形成的层次理论认为星系是由更小的碎片通过无数的冷暗物质合并而聚集起来的。单个星系的性质应该由六个独立的参数控制，包括质量，角动量，重子分数，年龄和大小，以及最近偶然的合并历史。在这里，我们报告说，一个样本的星系，首先检测到通过其中性氢射频发射，因此没有光学选择效应，显示五个独立的相关性之间的六个独立的观测，尽管有广泛的属性。这意味着这些星系的结构必须由一个单一的参数控制，尽管我们无法从我们的数据集中确定这个参数。这样的组织程度似乎与等级星系的形成不一致，这是宇宙学中冷暗物质模型的核心原则。

Galaxies are complex systems the evolution of which apparently results from the interplay of dynamics, star formation, chemical enrichment and feedback from supernova explosions and supermassive black holes. The hierarchical theory of galaxy formation holds that galaxies are assembled from smaller pieces, through numerous mergers of cold dark matter,,. The properties of an individual galaxy should be controlled by six independent parameters including mass, angular momentum, baryon fraction, age and size, as well as by the accidents of its recent haphazard merger history. Here we report that a sample of galaxies that were first detected through their neutral hydrogen radio-frequency emission, and are thus free from optical selection effects, shows five independent correlations among six independent observables, despite having a wide range of properties. This implies that the structure of these galaxies must be controlled by a single parameter, although we cannot identify this parameter from our data set. Such a degree of organization appears to be at odds with hierarchical galaxy formation, a central tenet of the cold dark matter model in cosmology.

Galaxies appear simpler than expected

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