论文标题
使用GAMA探测小型星系物理学对非线性红移空间变形的影响
Using GAMA to probe the impact of small-scale galaxy physics on nonlinear redshift-space distortions
论文作者
论文摘要
我们提出了由特殊速度引起的星系聚类的红移空间畸变的改进的建模。我们使用Bolshoi项目的数据在Halo模型的框架中创建模拟星系目录。这些模拟的星系种群插入了光环中，并具有额外的自由度，这些自由度控制着银河系相对于暗物质的空间和运动偏见。我们使用MCMC算法探索了这种广义的光晕模型，将预测与Galaxy和Mass Assembly（GAMA）调查的数据进行了比较，因此在晕圈内的卫星星系的详细运动学自由度上得出了最早的约束。通过这种方法，可以将红移空间星系自相关的扭曲降低到接近10 kpc的空间间隔，从而通过从非线性尺度中包含数据来提高RSD测量的前景。
We present improved modelling of the redshift-space distortions of galaxy clustering that arise from peculiar velocities. We create mock galaxy catalogues in the framework of the halo model, using data from the Bolshoi project. These mock galaxy populations are inserted into the haloes with additional degrees of freedom that govern spatial and kinematical biases of the galaxy populations relative to the dark matter. We explore this generalised halo model with an MCMC algorithm, comparing the predictions to data from the Galaxy And Mass Assembly (GAMA) survey, and thus derive one of the first constraints on the detailed kinematic degrees of freedom for satellite galaxies within haloes. With this approach, the distortions of the redshift-space galaxy autocorrelations can be accounted for down to spatial separations close to 10 kpc, opening the prospect of improved RSD measurements of the perturbation growth rate by the inclusion of data from nonlinear scales.
