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

Journal Article · · Monthly Notices of the Royal Astronomical Society
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ABSTRACT

We present measurements of the local primordial non-Gaussianity parameter $$f_{\mathrm{NL}}^\mathrm{local} $$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.

Research Organization:
Ohio University, Athens, OH (United States)
Sponsoring Organization:
Alfred P. Sloan Foundation; European Union’s Horizon 2020; Korean Ministry of Education, Science and Technology (MoEST); National Research Foundation of Korea (NRF); USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0014329; SC0019091
OSTI ID:
1873580
Alternate ID(s):
OSTI ID: 1979571
OSTI ID: 2290353
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 514; ISSN 0035-8711
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmological parameters
early universe
inflation
large-scale structure of universe