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

Rezaie, Mehdi; Ross, Ashley J.; Seo, Hee-Jong; Mueller, Eva-Maria; Percival, Will J.; Merz, Grant; Katebi, Reza; Bunescu, Razvan C.; Bautista, Julian; Brownstein, Joel R.; Burtin, Etienne; Dawson, Kyle; Gil-Marín, Héctor; Hou, Jiamin; Lyke, Eleanor B.; de la Macorra, Axel; Rossi, Graziano; Schneider, Donald P.; Zarrouk, Pauline; Zhao, Gong-Bo

doi:10.1093/mnras/stab1730

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

Journal Article · 17 June 2021 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stab1730 · OSTI ID:1810611

;

; Mueller, Eva-Maria; Percival, Will J.; Merz, Grant;

; Bunescu, Razvan C.;

;

; Burtin, Etienne; Dawson, Kyle;

; Hou, Jiamin; Lyke, Eleanor B.; de la Macorra, Axel; Rossi, Graziano; Schneider, Donald P.; Zarrouk, Pauline; Zhao, Gong-Bo

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 < z < 2.2 and 72 667 objects with redshifts 2.2 < z < 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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Research Organization:: Ohio Univ., Athens, OH (United States); Ohio University, Athens, OH (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231; SC0014329; SC0019091

OSTI ID:: 1810611

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 506; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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The Sdss-Iv Extended Baryon Oscillation Spectroscopic Survey: Luminous red Galaxy Target Selection Prakash, Abhishek; Licquia, Timothy C.; Newman, Jeffrey A. The Astrophysical Journal Supplement Series, Vol. 224, Issue 2 https://doi.org/10.3847/0067-0049/224/2/34	journal	June 2016
Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe Blanton, Michael R.; Bershady, Matthew A.; Abolfathi, Bela The Astronomical Journal, Vol. 154, Issue 1 https://doi.org/10.3847/1538-3881/aa7567	journal	June 2017
Spectral Evolution in high Redshift Quasars from the Final Baryon Oscillation Spectroscopic Survey Sample Jensen, Trey W.; Vivek, M.; Dawson, Kyle S. The Astrophysical Journal, Vol. 833, Issue 2 https://doi.org/10.3847/1538-4357/833/2/199	journal	December 2016
The SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations at Redshift of 0.72 with the DR14 Luminous Red Galaxy Sample Bautista, Julian E.; Vargas-Magaña, Mariana; Dawson, Kyle S. The Astrophysical Journal, Vol. 863, Issue 1 https://doi.org/10.3847/1538-4357/aacea5	journal	August 2018
The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations with Ly α Forests du Mas des Bourboux, Hélion; Rich, James; Font-Ribera, Andreu The Astrophysical Journal, Vol. 901, Issue 2 https://doi.org/10.3847/1538-4357/abb085	journal	October 2020
The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment Abolfathi, Bela; Aguado, D. S.; Aguilar, Gabriela The Astrophysical Journal Supplement Series, Vol. 235, Issue 2 https://doi.org/10.3847/1538-4365/aa9e8a	journal	April 2018
The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra Ahumada, Romina; Prieto, Carlos Allende; Almeida, Andrés The Astrophysical Journal Supplement Series, Vol. 249, Issue 1 https://doi.org/10.3847/1538-4365/ab929e	journal	June 2020
The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release Lyke, Brad W.; Higley, Alexandra N.; McLane, J. N. The Astrophysical Journal Supplement Series, Vol. 250, Issue 1 https://doi.org/10.3847/1538-4365/aba623	journal	August 2020

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