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首页> 外文期刊>The Astrophysical Journal. Letters >Mass-dependent baryon acoustic oscillation signal and halo bias
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Mass-dependent baryon acoustic oscillation signal and halo bias

机译：质量相关的重子声振荡信号和光晕偏置

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We characterize the baryon acoustic oscillations (BAO) feature in halo two-point statistics using N-body simulations. We find that nonlinear damping of the BAO signal is less severe for halos in the mass range we investigate than for dark matter. The amount of damping depends weakly on the halo mass. The correlation functions show a mass-dependent drop of the halo clustering bias below roughly 90 h ~(-1) Mpc, which coincides with the scale of the BAO trough. The drop of bias is 4% for halos with mass M > 10~(14) h ~(-1) M and reduces to roughly 2% for halos with mass M > 10 ~(13) h ~(-1) M. In contrast, halo biases in simulations without BAO change more smoothly around 90 h ~(-1) Mpc. In Fourier space, the bias of M > 10~(14) h ~(-1) M halos decreases smoothly by 11% from wavenumber k = 0.012 h Mpc~(-1) to 0.2 h Mpc ~(-1), whereas that of M > 10~(13) h ~(-1) M halos decreases by less than 4% over the same range. By comparing the halo biases in pairs of otherwise identical simulations, one with and the other without BAO, we also observe a modulation of the halo bias. These results suggest that precise calibrations of the mass-dependent BAO signal and scale-dependent bias on large scales would be needed for interpreting precise measurements of the two-point statistics of clusters or massive galaxies in the future.
机译：我们使用N体模拟来表征光晕两点统计中的重子声振荡（BAO）特征。我们发现，对于我们研究的质量范围内的晕圈，BAO信号的非线性衰减不如暗物质严重。阻尼量在很小程度上取决于光晕质量。相关函数显示，光晕聚类偏差的质量相关下降在大约90 h〜（-1）Mpc以下，这与BAO槽的规模一致。对于质量M> 10〜（14）h〜（-1）M的光晕，偏差下降为4％，对于质量M> 10〜（13）h〜（-1）M的光晕，偏压下降约为2％。相反，在没有BAO的模拟中，光晕偏差在90 h〜（-1）Mpc附近更平稳地变化。在傅立叶空间中，M> 10〜（14）h〜（-1）M晕的偏置从波数k = 0.012 h Mpc〜（-1）到0.2 h Mpc〜（-1）平稳降低11％，而在相同范围内，M> 10〜（13）h〜（-1）M的光晕下降小于4％。通过将成对的晕圈偏置在其他相同模拟对中进行比较，一个有BAO，另一个没有BAO，我们还观察到了晕圈偏置的调制。这些结果表明，将来需要对质量相关的BAO信号进行精确校准，并在大规模上对比例相关的偏差进行精确解释，才能解释星团或大质量星系的两点统计的精确测量结果。

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