Primordial non-Gaussianity from the completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey II: measurements in Fourier space with optimal weights

Eva Maria Mueller*, Mehdi Rezaie, Will J. Percival, Ashley J. Ross, Rossana Ruggeri, Hee Jong Seo, Héctor Gil-Marín, Julian Bautista, Joel R. Brownstein, Kyle Dawson, Axel De La MacOrra, Nathalie Palanque-Delabrouille, Graziano Rossi, Donald P. Schneider, Christophe Yéche

*Corresponding author for this work

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Abstract

We present measurements of the local primordial non-Gaussianity parameter fNLlocal from the clustering of 343 708 quasars with redshifts 0.8 < z < 2.2 distributed over 4808 deg2 from the final data release (DR16) of the extended Baryon Acoustic Oscillation Spectroscopic Survey (eBOSS), the largest volume spectroscopic survey up to date. Our analysis is performed in Fourier space, using the power spectrum monopole at very large scales to constrain the scale-dependent halo bias. We demonstrate the robustness of our analysis pipeline with EZ-mock catalogues that simulate the eBOSS DR16 target selection. We carefully assess the impact of systematics on our measurement, exploiting a novel neural network scheme for cleaning the DR16 sample as well as test multiple contamination removal methods. We estimate the bias due to the overcorrection of the systematic removal to be sub-dominant compared to the statistical uncertainty. We find fNL =-12 ± 21 (68 per cent confidence) for the main clustering sample including quasars with redshifts between 0.8 and 2.2, after applying redshift weighting techniques, designed for non-Gaussianity measurement from large scales structure, to optimize our analysis, which improve our results by 37 per cent.

Original languageEnglish
Pages (from-to)3396-3409
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume514
Issue number3
Early online date11 Apr 2022
DOIs
Publication statusPublished - 1 Aug 2022

Keywords

  • cosmological parameters
  • early Universe
  • inflation
  • large-scale structure of Universe

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