The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Large-scale structure catalogs for cosmological analysis
2 ICG - Institute of Cosmology and Gravitation [Portsmouth]
3 University of St Andrews [Scotland]
4 IfA - Institute for Astronomy [Edinburgh]
5 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
6 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
7 MPE - Max Planck Institute for Extraterrestrial Physics
8 University of Utah
9 ICCUB - Institut de Ciencies del Cosmos
10 IEEC-CSIC - Institute for Space Studies of Catalonia [Barcelona]
11 Department of Physics and Astronomy [Laramie]
12 Department of Physics and Astronomy [Waterloo]
13 Siena College [Loudonville]
14 Department of Physics [Oxford]
15 Perimeter Institute for Theoretical Physics [Waterloo]
16 EPFL - Ecole Polytechnique Fédérale de Lausanne
17 Ohio University
18 Physics & Astronomy Department [Ohio University]
19 Department of Physics [New York]
20 NAOC - National Astronomical Observatories [Beijing]
21 New Mexico State University
22 CIEMAT - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
23 Sejong University
24 KIPAC - Kavli Institute for Particle Astrophysics and Cosmology
25 UNAM - Universidad Nacional Autónoma de México = National Autonomous University of Mexico
26 LAM - Laboratoire d'Astrophysique de Marseille
27 CPPM - Centre de Physique des Particules de Marseille
28 Instituto de Ciencias Físicas
29 Department of Physics and Astronomy [Pittsburgh]
30 Universidad de Antofagasta
31 Center for Computational Astrophysics [New York]
32 Department of Astronomy and Astrophysics [PennState]
33 IIA - Indian Institute of Astrophysics
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Résumé
We present the large-scale structure catalogs from the recently completed extended Baryon Oscillation Spectroscopic Survey (eBOSS). Derived from Sloan Digital Sky Survey (SDSS) -IV Data Release 16 (DR16), these catalogs provide the data samples, corrected for observational systematics, and the associated catalogs of random positions sampling the survey selection function. Combined, they allow large-scale clustering measurements suitable for testing cosmological models. We describe the methods used to create these catalogs for the eBOSS DR16 Luminous Red Galaxy (LRG) and Quasar samples. The quasar catalog contains 343,708 redshifts with $0.8 < z < 2.2$ over 4,808\,deg$^2$. We combine 174,816 eBOSS LRG redshifts over 4,242\,deg$^2$ in the redshift interval $0.6 < z < 1.0$ with SDSS-III BOSS LRGs in the same redshift range to produce a combined sample of 377,458 galaxy redshifts distributed over 9,493\,deg$^2$. The algorithms for estimating redshifts have improved compared to previous eBOSS results such that 98 per cent of LRG observations resulted in a successful redshift, with less than one per cent catastrophic failures ($\Delta z > 1000$ ${\rm km~s}^{-1}$). For quasars, these rates are 95 and 2 per cent (with $\Delta z > 3000$ ${\rm km~s}^{-1}$). We apply corrections for trends both resulting from the imaging data used to select the samples for spectroscopic follow-up and the spectroscopic observations themselves. For example, the quasar catalog obtains a $\chi^2$/DoF $= 776/10$ for a null test against imaging depth before corrections and a $\chi^2$/DoF $= 6/8$ after. The catalogs, combined with careful consideration of the details of their construction found here-in, allow companion papers to present cosmological results with negligible impact from observational systematic uncertainties.
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