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

Cheng Zhao, Andrei Variu, Mengfan He, Daniel Forero-Sánchez, Amelie Tamone, Chia Hsun Chuang, Francisco Shu Kitaura, Charling Tao, Jiaxi Yu, Jean Paul Kneib, Will J. Percival, Huanyuan Shan, Gong Bo Zhao, Etienne Burtin, Kyle S. Dawson, Graziano Rossi, Donald P. Schneider, Axel De La MacOrra

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

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 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 km, s-1, Mpc-1,m = 0.290 ± 0.015, and Ω Λ h2 = 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.

Original languageEnglish (US)
Pages (from-to)5492-5524
Number of pages33
JournalMonthly Notices of the Royal Astronomical Society
Volume511
Issue number4
DOIs
StatePublished - Apr 1 2022

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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