三点关联函数的建模
Modeling the three-point correlation function
摘要：
我们提出了新的预测星系三点关联函数（3PCF）使用高分辨率无耗散宇宙学模拟的一个平坦的LCDM宇宙解决星系大小的晕和subhalos。我们创建逼真的模拟星系目录分配光度和颜色的暗物质晕和subhalos，我们测量减少3PCF作为一个功能的光度和颜色在真实和红移空间。由于星系的光度和颜色是不同的，我们发现在减少3PCF的振幅和形状的依赖性的小差异，在定性的水平与最近的测量从SDSS和2dFGRS一致。我们确认，以前的3PCF测量之间的差异可以部分解释由分仓选择的差异。我们探讨了一个简单的局部偏置模型可以适合模拟的3PCF的程度。模型预测和星系3PCF测量结果之间的一致性进一步证明了星系与CDM晕和subhalos之间的直接关联。
英文摘要：
We present new predictions for the galaxy three-point correlation function (3PCF) using high-resolution dissipationless cosmological simulations of a flat LCDM Universe which resolve galaxy-size halos and subhalos. We create realistic mock galaxy catalogs by assigning luminosities and colors to dark matter halos and subhalos, and we measure the reduced 3PCF as a function of luminosity and color in both real and redshift space. As galaxy luminosity and color are varied, we find small differences in the amplitude and shape dependence of the reduced 3PCF, at a level qualitatively consistent with recent measurements from the SDSS and 2dFGRS. We confirm that discrepancies between previous 3PCF measurements can be explained in part by differences in binning choices. We explore the degree to which a simple local bias model can fit the simulated 3PCF. The agreement between the model predictions and galaxy 3PCF measurements lends further credence to the straightforward association of galaxies with CDM halos and subhalos.
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