Two ways of biasing galaxy formation
Two ways of biasing galaxy formation
复制标题
偏置星系形成的两种方式
DOI：
10.1046/j.1365-8711.2000.04023.x
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发表时间：
2000
影响因子：
4.8
通讯作者：
M. Kamionkowski
中科院分区：
文献类型：
--
作者：
P. Catelan;C. Porciani;M. Kamionkowski
我们计算星系的双谱在真实的和红移空间，采用最常见的处方的本地欧拉偏置和拉格朗日演化偏置模型。我们发现，这两个偏置方案，使这些聚类统计的预测可测量不同。欧拉公式意味着星系分布只取决于当前的局部质量分布，而拉格朗日公式则将当前星系分布与星系最初形成时的早期质量分布联系起来。详细测量星系的双谱（其振幅减小）可以帮助确定星系的位置是由当前的质量分布还是早期的质量分布决定的。
We calculate the galaxy bispectrum in both real and redshift space, adopting the most common prescriptions for local Eulerian biasing and the Lagrangian evolving-bias model. We show that the two biasing schemes make measurably different predictions for these clustering statistics. The Eulerian prescription implies that the galaxy distribution depends only on the present-day local mass distribution, while its Lagrangian counterpart relates the current galaxy distribution to the mass distribution at an earlier epoch when galaxies first formed. Detailed measurement of the galaxy bispectrum (of its reduced amplitude) can help establish whether galaxy positions are determined by the current mass distribution or an earlier mass distribution.