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arXiv 2201.06932astro-ph.CO
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来自BOSS DR12 NGC CMASS的集成三光谱检测

Integrated trispectrum detection from BOSS DR12 NGC CMASS

Davide Gualdi, Licia Verde

摘要:

我们提出了第一次检测的综合三谱($\mathit{i}$ -三谱)的双极和四极信号从BOSS CMASS NGC DR 12。扩展的FKP估计形式主义的四点关联函数的傅立叶变换,我们测试散粒噪声减法,高斯的i-trispectrum数据向量,检测的意义和信号之间的相似性从数据和星系模拟目录用于数值估计的协方差矩阵。使用对应于从最小$k_\mathrm{min}=0.03\,h/\mathrm{Mpc}$到最大$k_\mathrm{min}=0.15\,h/\mathrm{Mpc}$的模式的尺度,我们找到了从$(10.4,5.2,8.3,1.1,3.1)$ $σ$的零假设的距离方面的检测-分别为i-三谱线和四极。这量化了BOSS数据上四点统计的物理信号的存在。为了完整性,同样的分析也进行功率谱和双谱,单极和四极。

英文摘要:

We present the first detection of the integrated trispectrum ($\mathit{i}$-trispectrum) monopole and quadrupoles signal from BOSS CMASS NGC DR12. Extending the FKP estimators formalism to the Fourier transform of the four-point correlation function, we test shot-noise subtraction, Gaussianity of the i-trispectrum data-vector, significance of the detection and similarity between the signal from the data and from the galaxy mock catalogues used to numerically estimate the covariance matrix. Using scales corresponding to modes from minimum $k_\mathrm{min}=0.03\,h/\mathrm{Mpc}$ to maximum $k_\mathrm{min}=0.15\,h/\mathrm{Mpc}$, we find a detection in terms of distance from the null hypothesis of $(10.4,5.2,8.3,1.1,3.1)$ $σ$-intervals for the i-trispectrum monopole and quadrupoles respectively. This quantifies the presence of the physical signal of the four-points statistics on BOSS data. For completeness the same analysis is also performed for power spectrum and bispectrum, both monopoles and quadrupoles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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