The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: growth rate of structure measurement from cosmic voids

Marie Aubert, Marie-Claude Cousinou, Stéphanie Escoffier, Adam J. Hawken, Seshadri Nadathur, Shadab Alam, Julian Bautista, Etienne Burtin, Arnaud de Mattia, Héctor Gil-Marín, Jiamin Hou, Eric Jullo, Richard Neveux, Graziano Rossi, Alex Smith, Amélie Tamone, Mariana Vargas Magaña

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We present a void clustering analysis in configuration-space using the completed Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic Survey (eBOSS) DR16 samples. These samples consist of Luminous Red Galaxies (LRG) combined with the high redshift tail of the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) DR12 CMASS galaxies (called as LRG+CMASS sample), Emission Line Galaxies (ELG) and quasars (QSO). We build void catalogues from the three eBOSS DR16 samples using a ZOBOV-based algorithm, providing 2,814 voids, 1,801 voids and 4,347 voids in the LRG+CMASS, ELG and QSO samples, respectively, spanning the redshift range 0.6 < z < 2.2. We measure the redshift space distortions (RSD) around voids using the anisotropic void-galaxy cross-correlation function and we extract the distortion parameter β. We test the methodology on realistic simulations before applying it to the data, and we investigate all our systematic errors on these mocks. We find βLRG(z = 0.74) = 0.415 ± 0.087, βELG(z = 0.85) = 0.665 ± 0.125 and βQSO(z = 1.48) = 0.313 ± 0.134, for the LRG+CMASS, ELG and QSO sample, respectively. The quoted errors include systematic and statistical contributions. In order to convert our measurements in terms of the growth rate fσ8, we use consensus values of linear bias from the eBOSS DR16 companion papers, resulting in the following constraints: ∫σ8(z = 0.74) = 0.50 ± 0.11, ƒσ8(z = 0.85) = 0.52 ± 0.10 and ƒσ8(z = 1.48) = 0.30 ± 0.13. Our measurements are consistent with other measurements from eBOSS DR16 using conventional clustering techniques.
Original languageEnglish
Pages (from-to)186-203
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date26 Mar 2022
Publication statusPublished - 1 Jun 2022


  • astro-ph.CO
  • cosmology
  • large-scale structure of the Universe
  • dark energy


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