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Primordial non-Gaussianity from the completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey – I: Catalogue preparation and systematic mitigation

Mehdi RezaieDepartment of Physics and Astronomy, Ohio University , Athens, OH 45701, USAA.J. RossCenter of Cosmology and AstroParticle Physics, The Ohio State University , Columbus, OH 43210, USAHee‐Jong SeoDepartment of Physics and Astronomy, Ohio University , Athens, OH 45701, USAEva-Maria MuellerDepartment of Physics, University of Oxford , Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKWill J. PercivalDepartment of Physics and Astronomy, University of Waterloo , Waterloo ON N2L 3G1, CanadaGrant MerzDepartment of Physics and Astronomy, Ohio University , Athens, OH 45701, USAReza KatebiDepartment of Physics and Astronomy, Ohio University , Athens, OH 45701, USARăzvan BunescuDepartment of Computer Science, College of Computing and Informatics, University of North Carolina , Charlotte, NC 28223, USAJulian BautistaInstitute of Cosmology & Gravitation, Dennis Sciama Building, University of Portsmouth , Portsmouth PO1 3FX, UKJoel R. BrownsteinDepartment of Physics and Astronomy, University of Utah , 115 S. 1400 E., Salt Lake City, UT 84112, USAE. BurtinIRFU,CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, FranceKyle DawsonDepartment of Physics and Astronomy, University of Utah , 115 S. 1400 E., Salt Lake City, UT 84112, USAHéctor Gil-MarínInstitut de Ciències del Cosmos, Universitat de Barcelona , ICCUB, Martí i Franquès 1, E-08028 Barcelona, SpainJiamin HouMax-Planck-Institut für Extraterrestrische Physik , Postfach 1312, Giessenbachstr., D-85748 Garching bei München, GermanyEleanor B LykeDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USAAxel de la MacorraInstituto de Fisica, Universidad Nacional Autonoma de Mexico , Apdo. Postal 20-364, MexicoGraziano RossiDepartment of Physics and Astronomy, Sejong University , Seoul 143-747, KoreaDonald P. SchneiderDepartment of Astronomy and Astrophysics, The Pennsylvania State University , University Park, PA 16802, USAPauline ZarroukIRFU,CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, FranceGong‐Bo ZhaoNational Astronomy Observatories, Chinese Academy of Science , Beijing 100101, China

2021en

ABI

Annotatsiya

ABSTRACT We investigate the large-scale clustering of the final spectroscopic sample of quasars from the recently completed extended Baryon Oscillation Spectroscopic Survey (eBOSS). The sample contains 343 708 objects in the redshift range 0.8 &lt; z &lt; 2.2 and 72 667 objects with redshifts 2.2 &lt; z &lt; 3.5, covering an effective area of $4699\, {\rm deg}^{2}$. We develop a neural network-based approach to mitigate spurious fluctuations in the density field caused by spatial variations in the quality of the imaging data used to select targets for follow-up spectroscopy. Simulations are used with the same angular and radial distributions as the real data to estimate covariance matrices, perform error analyses, and assess residual systematic uncertainties. We measure the mean density contrast and cross-correlations of the eBOSS quasars against maps of potential sources of imaging systematics to address algorithm effectiveness, finding that the neural network-based approach outperforms standard linear regression. Stellar density is one of the most important sources of spurious fluctuations, and a new template constructed using data from the Gaia spacecraft provides the best match to the observed quasar clustering. The end-product from this work is a new value-added quasar catalogue with the improved weights to correct for non-linear imaging systematic effects, which will be made public. Our quasar catalogue is used to measure the local-type primordial non-Gaussianity in a companion paper.

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DOI: 10.1093/mnras/stab1730

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