TY - JOUR
T1 - Primordial non-Gaussianity from the completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey II
T2 - measurements in Fourier space with optimal weights
AU - Mueller, Eva Maria
AU - Rezaie, Mehdi
AU - Percival, Will J.
AU - Ross, Ashley J.
AU - Ruggeri, Rossana
AU - Seo, Hee Jong
AU - Gil-Marín, Héctor
AU - Bautista, Julian
AU - Brownstein, Joel R.
AU - Dawson, Kyle
AU - De La MacOrra, Axel
AU - Palanque-Delabrouille, Nathalie
AU - Rossi, Graziano
AU - Schneider, Donald P.
AU - Yéche, Christophe
N1 - Publisher Copyright:
© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2022/8/1
Y1 - 2022/8/1
N2 - 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.
AB - 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.
KW - cosmological parameters
KW - early Universe
KW - inflation
KW - large-scale structure of Universe
UR - http://www.scopus.com/inward/record.url?scp=85134164272&partnerID=8YFLogxK
U2 - 10.1093/mnras/stac812
DO - 10.1093/mnras/stac812
M3 - Article
AN - SCOPUS:85134164272
SN - 0035-8711
VL - 514
SP - 3396
EP - 3409
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -