The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: cosmological implications from multitracer BAO analysis with galaxies and voids

Journal Article · Sun Feb 13 00:00:00 EST 2022 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stac390· OSTI ID:1982673

Zhao, Cheng ^[1]; Variu, Andrei ^[1]; He, Mengfan ^[2]; Forero-Sánchez, Daniel ^[1]; Tamone, Amélie ^[1]; Chuang, Chia-Hsun ^[3]; Kitaura, Francisco-Shu ^[4]; Tao, Charling ^[5]; Yu, Jiaxi ^[1]; Kneib, Jean-Paul ^[6]; Percival, Will J. ^[7]; Shan, Huanyuan ^[8]; Zhao, Gong-Bo ^[9]; Burtin, Etienne ^[10]; Dawson, Kyle S. ^[11]; Rossi, Graziano ^[12]; Schneider, Donald P. ^[13]; de la Macorra, Axel ^[14]

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1. École Polytechnique Fédérale de Lausanne (EPFL), Versoix (Switzerland)
2. Chinese Academy of Sciences (CAS), Beijing (China); Shanghai Astronomical Observatory (China); University of Chinese Academy of Sciences, Beijing (China)
3. Stanford University, CA (United States)
4. Instituto de Astrofísica de Canarias, Tenerife (Spain); Universidad de La Laguna, Tenerife (Spain)
5. Aix-Marseille Université (France); Tsinghua University, Beijing (China)
6. École Polytechnique Fédérale de Lausanne (EPFL), Versoix (Switzerland); Aix Marseille University (France)
7. University of Waterloo, ON (Canada); Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)
8. Shanghai Astronomical Observatory (China)
9. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
10. Université Paris-Saclay, Gif-sur-Yvette (France)
11. University of Utah, Salt Lake City, UT (United States)
12. Sejong University, Seoul (Korea)
13. Pennsylvania State University, University Park, PA (United States)
14. Universidad Nacional Autónoma de México (Mexico)

We construct cosmic void catalogues with the dive void finder upon SDSS BOSS DR12 and eBOSS DR16 galaxy samples with BAO reconstruction, and perform a joint BAO analysis using different types of galaxies and the corresponding voids. The BAO peak is evident for the galaxy–galaxy, galaxy–void, and void–void correlation functions of all data sets, including the ones cross-correlating LRG and ELG samples. Two multitracer BAO fitting schemes are tested, one combining the galaxy and void correlation functions with a weight applied to voids, and the other using a single BAO dilation parameter for all clustering measurements. Both methods produce consistent results with mock catalogues, and on average ~10 per cent improvements of the BAO statistical uncertainties are observed for all samples, compared to the results from galaxies alone. By combining the clustering of galaxies and voids, the uncertainties of BAO measurements from the SDSS data are reduced by 5–15 per cent, yielding 0.9 per cent, 0.8 per cent, 1.1 per cent, 2.3 per cent, and 2.9 per cent constraints on the distance $$D_{_{\rm V}}(z)$$, at effective redshifts 0.38, 0.51, 0.70, 0.77, and 0.85, respectively. When combined with BAO measurements from SDSS MGS, QSO, and Lyα samples, as well as the BBN results, we obtain $$H_0 = 67.58 \pm 0.91\, {\rm km}\, {\rm s}^{-1}\, {\rm Mpc}^{-1}$$, Ω_m = 0.290 ± 0.015, and $$\Omega _\Lambda h^2 = 0.3241 \pm 0.0079$$ in the flat-ΛCDM framework, where the 1σ uncertainties are around 6 per cent, 6 per cent, and 17 per cent smaller respectively, compared to constraints from the corresponding anisotropic BAO measurements without voids and LRG–ELG cross-correlations.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
• Sponsoring Organization: National Research Foundation of Korea (NRF); Swiss National Science Foundation (SNF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1982673
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 511; ISSN 0035-8711
• Publisher: Oxford University Press
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Astronomy & Astrophysics
cosmological parameters
distance scale
large-scale structure of Universe
methods: data analysis