arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1702.00853astro-ph.CO
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理解高红移星系的非线性成团

Understanding the non-linear clustering of high redshift galaxies

Charles Jose, Carlton M. Baugh, Cedric G. Lacey, Kandaswamy Subramanian

摘要:

我们将Jose等人(2016)建模的暗物质晕的非线性聚类纳入晕模型,以更好地理解红移范围$z=3-5$中的莱曼破裂星系(LBG)的聚类。我们发现,随着这种变化,预测的LBG聚类显着增加准线性尺度($0.1 \leq r\,/\,h^{-1} \,{\rm Mpc} \leq 10$)相比,在线性晕偏模型。这又导致LBG的聚集在角度尺度$5" \leq θ\leq 100"$上增加一个数量级。值得注意的是,我们的新模型的预测总体上消除了线性晕偏差预测与观测之间的系统性差异。在非线性晕偏置模型中,LBG的关联长度和大尺度星系偏置值明显高于线性晕偏置模型。由此产生的两点关联函数保留了近似的幂律形式与使用线性晕偏理论计算。我们还发现LBG的非线性成团随光度和红移的增加而增加。我们的工作强调了使用非线性晕偏的重要性,以模拟高z星系的成团探测星系形成的物理和可靠地提取宇宙学参数。

英文摘要:

We incorporate the non-linear clustering of dark matter halos, as modelled by Jose et al. (2016) into the halo model to better understand the clustering of Lyman break galaxies (LBGs) in the redshift range $z=3-5$. We find that, with this change, the predicted LBG clustering increases significantly on quasi-linear scales ($0.1 \leq r\,/\,h^{-1} \,{\rm Mpc} \leq 10$) compared to that in the linear halo bias model. This in turn results in an increase in the clustering of LBGs by an order of magnitude on angular scales $5" \leq θ\leq 100"$. Remarkably, the predictions of our new model on the whole remove the systematic discrepancy between the linear halo bias predictions and the observations. The correlation length and large scale galaxy bias of LBGs are found to be significantly higher in the non-linear halo bias model than in the linear halo bias model. The resulting two-point correlation function retains an approximate power-law form in contrast with that computed using the linear halo bias theory. We also find that the non-linear clustering of LBGs increases with increasing luminosity and redshift. Our work emphasizes the importance of using non-linear halo bias in order to model the clustering of high-z galaxies to probe the physics of galaxy formation and extract cosmological parameters reliably.

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