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arXiv 1510.08067astro-ph.GA
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EAGLE流体动力学模拟揭示的星系中恒星形成的基本面

The fundamental plane of star formation in galaxies revealed by the EAGLE hydrodynamical simulations

Claudia del P. Lagos, Tom Theuns, Joop Schaye, Michelle Furlong, Richard G. Bower, Matthieu Schaller, Robert A. Crain, James W. Trayford, Jorryt Matthee

摘要:

我们在“银河系及其环境的演化和组装”(EAGLE)宇宙流体动力学模拟程序包中研究了红移范围$0\le z\le 4.5$内恒星形成星系的不同物理性质之间的相关性。主成分分析表明,中性气体分数($f_{\rm gas, neutral}$),恒星质量($M_{\rm stellar}$)和恒星形成率(SFR)占人口中看到的大部分方差,与星系跟踪二维,几乎平坦,表面在三维空间的$f_{\rm gas, neutral}-M_{\rm stellar}-\rm SFR$几乎没有散射。这个平面的位置随红移的变化很小,而星系本身沿着这个平面移动,因为它们的$f_{\rm gas, neutral}$和SFR随红移而下降。星系在平面上的位置与气体金属丰度高度相关。因此,可以从$f_{\rm gas, neutral}$或从$M_{\rm stellar}$和SFR稳健地预测金属丰度。我们认为,这个“恒星形成的基本平面”的外观是自我调节的结果,与平面的曲率设置的依赖SFR的气体密度和金属丰度。我们分析了一个大型汇编的观测跨越红移范围$0\lesssim \rm z\lesssim 2.5$,并发现这样一个平面也存在于数据中。观测到的恒星形成基平面的性质与EAGLE的预测非常一致。

英文摘要:

We investigate correlations between different physical properties of star-forming galaxies in the "Evolution and Assembly of GaLaxies and their Environments" (EAGLE) cosmological hydrodynamical simulation suite over the redshift range $0\le z\le 4.5$. A principal component analysis reveals that neutral gas fraction ($f_{\rm gas, neutral}$), stellar mass ($M_{\rm stellar}$) and star formation rate (SFR) account for most of the variance seen in the population, with galaxies tracing a two-dimensional, nearly flat, surface in the three-dimensional space of $f_{\rm gas, neutral}-M_{\rm stellar}-\rm SFR$ with little scatter. The location of this plane varies little with redshift, whereas galaxies themselves move along the plane as their $f_{\rm gas, neutral}$ and SFR drop with redshift. The positions of galaxies along the plane are highly correlated with gas metallicity. The metallicity can therefore be robustly predicted from $f_{\rm gas, neutral}$, or from the $M_{\rm stellar}$ and SFR. We argue that the appearance of this "fundamental plane of star formation" is a consequence of self-regulation, with the plane's curvature set by the dependence of the SFR on gas density and metallicity. We analyse a large compilation of observations spanning the redshift range $0\lesssim \rm z\lesssim 2.5$, and find that such a plane is also present in the data. The properties of the observed fundamental plane of star formation are in good agreement with EAGLE's predictions.

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