Iterative Reconstruction Excursions for Baryon Acoustic Oscillations and Beyond
The density field reconstruction technique has been widely used for reco v ering the baryon acoustic oscillation (BAO) feature in galaxy surv e ys that has been degraded due to non-linearities. Recent studies advocated adopting iterative steps to impro v e the reco v ery much be yond that of the standard technique. In this paper, we investigate the performance of a few selected iterative re- construction techniques focusing on the BAO and the broad-band shape of the two-point clustering. We include redshift-space dis- tortions, halo bias, and shot noise and inspect the components of the reconstructed field in Fourier space and in configuration space using both density field-based reconstruction and displacement field-based reconstruction. We find that the displacement field reconstruction becomes quickly challenging in the presence of non-negligible shot noise and therefore present surrogate methods that can be practically applied to a much more sparse field such as galaxies. For a galaxy field, implementing a debiasing step to remo v e the Lagrangian bias appears crucial for the displacement field reconstruction. We show that the iterative reconstruction does not substantially impro v e the BAO feature beyond an aggressively optimized standard reconstruction with a small smoothing kernel. Ho we ver, we find taking iterative steps allows us to use a small smoothing kernel more 'stably', i.e. without causing a substantial deviation from the linear power spectrum on large scales. In one specific example we studied, we find that a deviation of 13 per cent in P ( k ∼0 . 1 h Mpc-1 ) with an aggressive standard reconstruction can reduce to 3-4 per cent with iterative steps.
H. J. Seo et al., "Iterative Reconstruction Excursions for Baryon Acoustic Oscillations and Beyond," Monthly Notices of the Royal Astronomical Society, vol. 511, no. 2, pp. 1557 - 1573, Oxford University Press, Apr 2022.
The definitive version is available at https://doi.org/10.1093/mnras/stac082
Keywords and Phrases
Cosmological Parameters; Large-Scale Structure of Universe
International Standard Serial Number (ISSN)
Article - Journal
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01 Apr 2022