Properties of galaxies reproduced by a hydrodynamic simulation
Properties of galaxies reproduced by a hydrodynamic simulation
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DOI：
10.1038/nature13316
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发表时间：
2014-05
期刊：
影响因子：
64.8
通讯作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton
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文献类型：
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作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton
以前对宇宙结构增长的模拟已经广泛地复制了我们在宇宙中看到的星系的“宇宙网”，但由于数值不准确和不完整的物理模型，未能创造出椭圆星系和螺旋星系的混合种群。此外，他们无法在宇宙的一个代表性部分中追踪到当前时代的气体和恒星的小规模演化。在这里，我们报告了一个从大爆炸后1200万年开始的模拟，并在一个边长为106.5兆秒差距的立方体中用120亿分辨率的元素追踪了130亿年的宇宙演化。它产生了一个合理的人口的椭圆和螺旋，再现观察到的星系团中的分布和氢的大尺度上的特点，并在同一时间匹配的“金属”和氢含量的星系在小尺度上。
Previous simulations of the growth of cosmic structures have broadly reproduced the ‘cosmic web’ of galaxies that we see in the Universe, but failed to create a mixed population of elliptical and spiral galaxies, because of numerical inaccuracies and incomplete physical models. Moreover, they were unable to track the small-scale evolution of gas and stars to the present epoch within a representative portion of the Universe. Here we report a simulation that starts 12 million years after the Big Bang, and traces 13 billion years of cosmic evolution with 12 billion resolution elements in a cube of 106.5 megaparsecs a side. It yields a reasonable population of ellipticals and spirals, reproduces the observed distribution of galaxies in clusters and characteristics of hydrogen on large scales, and at the same time matches the ‘metal’ and hydrogen content of galaxies on small scales.