The impact of feedback from galaxy formation on the Lyman α transmitted flux
The impact of feedback from galaxy formation on the Lyman α transmitted flux
复制标题
星系形成的反馈对莱曼α传输通量的影响
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Kavli Institute
中科院分区：
文献类型：
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作者：
M. Viel;J. Schaye;C. M. B. I. O. A. Trieste;I. Trieste;L. Observatory;Leiden University;D. O. Astronomy;Astrophysics;Kavli Institute
遥远类星体光谱中的莱曼α吸收线森林已成为探测宇宙物质分布的重要手段。我们使用大型流体动力学模拟从OverWhelmingly Large Simulations项目项目调查反馈星系形成的概率分布函数和功率谱的莱曼α透射通量的效果。虽然金属线冷却并不重要，但活动星系核驱动的大质量星系的星系外流和超新星驱动的低质量星系的风对通量统计有重大影响。在红移z = 2.25时，对通量统计的影响与已公布数据集的统计不确定性具有相似的量级。通量统计的变化不是由于光电离气体的温度-密度关系的差异。相反，它们是由密度分布和热的碰撞电离气体部分的变化引起的。利用天体物理学和宇宙学效应引起不同的红移依赖性这一事实，或许可以解开它们之间的纠缠。特别是，反馈效应的大小似乎随着红移的增加而迅速减小。对目前正在进行的调查（如斯隆数字巡天III（BOSS/SDSS-III）和X射手/甚大望远镜（VLT）的重子振荡光谱巡天）的莱曼α森林数据的分析必须考虑星系风。
The forest of Lyman α absorption lines seen in the spectra of distant quasars has become an important probe of the distribution of matter in the Universe. We use large, hydrodynamical simulations from the OverWhelmingly Large Simulations project project to investigate the effect of feedback from galaxy formation on the probability distribution function and the power spectrum of the Lyman α transmitted flux. While metal-line cooling is unimportant, both galactic outflows from massive galaxies driven by active galactic nuclei and winds from low-mass galaxies driven by supernovae have a substantial impact on the flux statistics. At redshift z = 2.25, the effects on the flux statistics are of a similar magnitude as the statistical uncertainties of published data sets. The changes in the flux statistics are not due to differences in the temperature–density relation of the photoionized gas. Instead, they are caused by changes in the density distribution and in the fraction of hot, collisionally ionized gas. It may be possible to disentangle astrophysical and cosmological effects by taking advantage of the fact that they induce different redshift dependencies. In particular, the magnitude of the feedback effects appears to decrease rapidly with increasing redshift. Analyses of Lyman α forest data from surveys that are currently in process, such as Baryon Oscillation Spectroscopic Survey of the Sloan Digital Sky Survey-III (BOSS/SDSS-III) and X-Shooter/Very Large Telescope (VLT), must take galactic winds into account.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.