Overview of the Dark Energy Spectroscopic Instrument

Martini, Paul; Bailey, Stephen; Besuner, Robert W.; Brooks, David; Doel, Peter; Edelstein, Jerry; Eisenstein, Daniel; Flaugher, Brenna; Gutierrez, Gaston; Harris, Stewart E.; Honscheid, Klaus; Jelinsky, Patrick; Joyce, Richard; Kent, Stephen; Levi, Michael; Prada, Francisco; Poppett, Claire; Rabinowitz, David; Rockosi, Constance; Sas, Laia Cardiel; Schlegel, David J.; Schubnell, Michael; Sharples, Ray; Silber, Joseph H.; Sprayberry, David; Wechsler, Risa

doi:10.48550/arxiv.1807.09287

Cited by 1 publication

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“…The main limitation of this technique is the approximate treatment of the non-linear dynamics that may degrade the quality of the reconstruction. More sophisticated techniques are required in next-generation redshift surveys, such as those realised by PFS-SuMIRe (Takada et al 2014), eBOSS (Dawson et al 2016), 4MOST (de Jong et al 2016), DESI (Martini et al 2018), Euclid (Laureijs et al 2011), or WFIRST (Doré et al 2018), which will sample a large range of galaxy overdensities within cosmological volumes. Indeed, in large overdensity regions (i.e.…”

Section: Introductionmentioning

confidence: 99%

BAO reconstruction: a swift numerical action method for massive spectroscopic surveys

Sarpa

Schimd

Branchini

et al. 2019

Monthly Notices of the Royal Astronomical Society

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A new fully non-linear reconstruction algorithm for the accurate recovery of the Baryonic Acoustic Oscillations (BAO) scale in two-point correlation functions is proposed, based on the least-action principle and extending the Fast Action Minimisation method by Nusser & Branchini (2000). Especially designed for massive spectroscopic surveys, it is tested on dark-matter halo catalogues extracted from the deus-fur ΛCDM simulation to trace the trajectories of up to ∼ 207, 000 haloes backward-in-time, well beyond the first-order Lagrangian approximation. The new algorithm successfully recovers the BAO feature in real and redshift-space in both the monopole and the anisotropic two-point correlation function, also for anomalous samples showing misplaced or absent signature of BAO. In redshift space, the non-linear displacement parameter Σ NL is reduced from 11.8±0.3h −1 Mpc at redshift z = 0 to 4.0±0.5h −1 Mpc at z 37 after reconstruction. A comparison with the first-order Lagrangian reconstruction is presented, showing that this techniques outperforms the linear approximation in recovering an unbiased measurement of the acoustic scale.

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