The circumgalactic medium of high-redshift galaxies
The circumgalactic medium of high-redshift galaxies
复制标题
高红移星系的环绕星系介质
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Ferrara
中科院分区：
文献类型：
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作者：
A. Pallottini;S. Gallerani;A. Ferrara
我们在Pallottini等人2014年提出的金属富集模拟中研究了高z$星系的环星系介质（CGM）的性质。在$z=4$，我们发现，模拟CGM气体密度分布是自相似的，一旦缩放与维里半径的父暗物质晕。我们还发现了一个简单的分析表达式的中性氢等效宽度（${\rmEW}_{\rmHI}$）的CGM吸收器作为视线的影响参数（$B$）的函数。我们测试我们的预测对模拟光谱提取的模拟，并表明，该模型再现${\rm EW}_{\rm HI}（B）$配置文件提取的合成光谱分析。与现有数据相比，我们的CGM模型很好地预测了z\lesssim2 $星系中观测到的${\rmEW}_{\rmHI}（B）$，并支持CGM轮廓不随红移而演化的观点.
We study the properties of the circumgalactic medium (CGM) of high-$z$ galaxies in the metal enrichment simulations presented in Pallottini et al. 2014. At $z=4$, we find that the simulated CGM gas density profiles are self-similar, once scaled with the virial radius of the parent dark matter halo. We also find a simple analytical expression relating the neutral hydrogen equivalent width (${\rm EW}_{\rm HI}$) of CGM absorbers as a function of the line of sight impact parameter ($b$). We test our predictions against mock spectra extracted from the simulations, and show that the model reproduces the ${\rm EW}_{\rm HI}(b)$ profile extracted from the synthetic spectra analysis. When compared with available data, our CGM model nicely predicts the observed ${\rm EW}_{\rm HI}(b)$ in $z\lesssim2$ galaxies, and supports the idea that the CGM profile does not evolve with redshift.