论文标题
用高阶统计来限制银河系连接
Constraining galaxy-halo connection with high-order statistics
论文作者
论文摘要
我们在约束Galaxy-Halo连接时使用三点统计数据进行了研究。我们表明，对于某些星系样本，对光环职业分布参数的约束由三点函数信号（在其两点对应物上）主导。我们在对应于黑暗能量光谱仪器（DESI）靶向的对应于发光红星系（LRG），发射线星系（ELG）和类星体（QSOS）的模拟目录上证明了这一点。三角侧的预计三分函数少于20 $ h^{ - 1} $ MPC从数据立方GPC测量的数据可以限制LRGS的特征最小质量，精度为0.46美元。为了进行比较，预计的两点功能的类似限制为$ 1.55 $％。 ELG和QSOS目标的改进更为适中。在QSO的情况下，它是由样品的高射击量引起的，而对于ELG，这是由宿主光晕的光环质量范围引起的。我们管道中最耗时的部分是测量三点函数。我们采用了针对两点函数的早期作品中提出的制表法，以显着减少三点分析所需的计算时间。
We investigate using three-point statistics in constraining the galaxy-halo connection. We show that for some galaxy samples, the constraints on the halo occupation distribution parameters are dominated by the three-point function signal (over its two-point counterpart). We demonstrate this on mock catalogs corresponding to the Luminous Red Galaxies (LRGs), Emission-Line Galaxies (ELG), and quasars (QSOs) targeted by the Dark Energy Spectroscopic Instrument (DESI) Survey. The projected three-point function for triangle sides less up to 20$h^{-1}$ Mpc measured from a cubic Gpc of data can constrain the characteristic minimum mass of the LRGs with a precision of $0.46$ %. For comparison, similar constraints from the projected two-point function are $1.55$ %. The improvements for the ELGs and QSOs targets are more modest. In the case of the QSOs it is caused by the high shot-noise of the sample, and in the case of the ELGs, this is caused by the range of halo masses of the host halos. The most time-consuming part of our pipeline is the measurement of the three-point functions. We adopt a tabulation method, proposed in earlier works for the two-point function, to reduce significantly the required compute time for the three-point analysis.
