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Redshift-weighted constraints on primordial non-Gaussianity from the clustering of the eBOSS DR14 quasars in Fourier space

Emanuele CastorinaBerkeley Center for Cosmological Physics, Department of Physics, University of California, Berkeley, CA 94720, U.S.ANick HandDepartment of Astronomy, University of California, Berkeley, CA 94720, U.S.AUroš SeljakBerkeley Center for Cosmological Physics, Department of Physics, University of California, Berkeley, CA 94720, U.S.AFlorian BeutlerInstitute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX, U.KChia-Hsun ChuangKavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, U.S.ACheng ZhaoLaboratoire d'Astrophysique, É cole Polytechnique Fédérale de Lausanne, 1015 Lausanne, SwitzerlandHéctor Gil-MarínICC, University of Barcelona, IEEC-UB, Martí i Franquès, 1, E08028 Barcelona, SpainWill J. PercivalDepartment of Physics and Astronomy, University of Waterloo, 200 University Ave. W., Waterloo, Ontario N2L 3G1, CanadaAshley J. RossDepartment of Astronomy, The Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, U.S.APeter Doohyun ChoiDepartment of Physics and Astronomy, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul, South KoreaKyle DawsonDepartment of Physics and Astronomy, University of Utah, 115 S. 1400 E., Salt Lake City, UT 84112, U.S.AAxel de la MacorraInstituto de Física, Universidad Nacional Autónoma de México, Apdo. Postal 20-364, MéxicoGraziano RossiDepartment of Physics and Astronomy, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul, South KoreaRossana RuggeriInstitute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX, U.KDonald SchneiderInstitute for Gravitation and the Cosmos, Pennsylvania State University, University Park, PA 16802, U.S.AGong-Bo ZhaoNational Astronomical Observatories of China, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China

2019en

ABI

Аннотация

We present constraints on local primordial non-Gaussianity (PNG), parametrized through f(NL)(loc), using the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey Data Release 14 quasar sample. We measure and analyze the anisotropic clustering of the quasars in Fourier space, testing for the scale-dependent bias introduced by primordial non-Gaussianity on large scales. We derive and employ a power spectrum estimator using optimal weights that account for the redshift evolution of the PNG signal. We find constraints of -51 < f(NL)(loc), < 21 at 95% confidence level. These are among the tightest constraints from Large Scale Structure (LSS) data. Our redshift weighting improves the error bar by 15% in comparison to the unweighted case. If quasars have lower response to PNG, the constraint degrades to -81 < f(NL)(loc) < 26, with a 40% improvement over the standard approach. We forecast that the full eBOSS dataset could reach sigma( fNLloc) similar or equal to 5-8 using optimal methods and full range of scales.

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DOI: 10.1088/1475-7516/2019/09/010

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