Cosmic Tidal Reconstruction in Redshift Space

Gravitational coupling between large- and small-scale density perturbations leads to anisotropic distortions to local small-scale matter fluctuations. Such local anisotropic distortions can be used to reconstruct large-scale matter distribution, known as tidal reconstruction. In this paper, we apply...

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Bibliographic Details
Published in:The Astrophysical journal 2024-02, Vol.962 (1), p.21
Main Authors: Zang, Shi-Hui, Zhu, Hong-Ming, Schmittfull, Marcel, Pen, Ue-Li
Format: Article
Language:English
Subjects:
Cosmology
Density
Galaxies
Large-scale structure of the universe
Non-Gaussianity
Reconstruction
Red shift
Tracers
Variance analysis
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Summary:Gravitational coupling between large- and small-scale density perturbations leads to anisotropic distortions to local small-scale matter fluctuations. Such local anisotropic distortions can be used to reconstruct large-scale matter distribution, known as tidal reconstruction. In this paper, we apply the tidal reconstruction methods to simulated galaxies in redshift space. We find that redshift-space distortions (RSDs) lead to anisotropic reconstruction results. While the reconstructed radial modes are more noisy mainly due to the small-scale velocity dispersion, the transverse modes are still reconstructed with high fidelity, and well correlated with the original large-scale density modes. The bias of the reconstructed field at large scales shows a simple angular dependence, which can be described by a form similar to that of the linear RSD. The noise power spectrum is nearly isotropic and scale independent on large scales. This makes the reconstructed tide fields an ideal tracer for cosmic variance cancellation and multi-tracer analysis and has profound implications for future 21 cm intensity mapping surveys.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad0cf0