Cosmic Tidal Reconstruction with Halo Fields

Zhu, Hong-Ming; Mao, Tian-Xiang; Pen, Ue-Li

doi:10.48550/arxiv.2108.01575

Cited by 1 publication

(1 citation statement)

References 29 publications

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“…[41] has further confirmed this result. Additional insights into tide reconstruction from tracers in real and redshift space are provided by [42] and [43]. Also see [44] for its application to recovering missing radial long modes in 21cm intensity mapping surveys, and [45] in the context of lensing reconstruction of line intensity mapping.…”

Section: Jcap07(2024)020mentioning

confidence: 99%

Reconstructing the long-wavelength matter density fluctuation modes from the scalar-type clustering fossils

Wang,

Jeong

2024

J. Cosmol. Astropart. Phys.

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Revealing the large-scale structure from the 21cm intensity mapping surveys is only possible after the foreground cleaning. However, most current cleaning techniques relying on the smoothness of the foreground spectrum lead to a severe side effect of removing the large-scale structure signal along the line of sight. On the other hand, the clustering fossil, a coherent variation of the small-scale clustering over large scales, allows us to recover the long-wavelength density modes from the off-diagonal correlation between short-wavelength modes. In this paper, we revisit the reconstruction based on the short-wavelength matter density modes in real space and scrutinize the requirements for an unbiased and optimal clustering-fossil estimator. We show that (A) the estimator is unbiased only when using an accurate bispectrum model for the long-short-short mode coupling and (B) including the connected four-point correlation functions is essential for characterizing the noise power spectrum of the estimated long mode. For matter in real space, the clustering fossil estimator based upon the leading-order bispectrum yields an unbiased estimation of the long-wavelength (k ≲ 0.01 [h/Mpc]) modes with the cross-correlation coefficient of 0.7 at redshifts z = 0 to 3.

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