The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: A multitracer analysis in Fourier space for measuring the cosmic structure growth and expansion rate

Gong Bo Zhao, Yuting Wang, Atsushi Taruya, Weibing Zhang, Héctor Gil-Marín, Arnaud De Mattia, Ashley J. Ross, Anand Raichoor, Cheng Zhao, Will J. Percival, Shadab Alam, Julian E. Bautista, Etienne Burtin, Chia Hsun Chuang, Kyle S. Dawson, Jiamin Hou, Jean Paul Kneib, Kazuya Koyama, Hélion Du Mas Des Bourboux, Eva Maria MuellerJeffrey A. Newman, John A. Peacock, Graziano Rossi, Vanina Ruhlmann-Kleider, Donald P. Schneider, Arman Shafieloo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We perform a joint BAO and RSD analysis using the eBOSS DR16 LRG and ELG samples in the redshift range of z [0.6, 1.1], and detect an RSD signal from the cross-power spectrum at a ∼4σ confidence level, i.e., fσ8 = 0.317 ± 0.080 at zeff = 0.77. Based on the chained power spectrum, which is a new development in this work to mitigate the angular systematics, we measure the BAO distances and growth rate simultaneously at two effective redshifts, namely, DM/rd (z = 0.70) = 17.96 ± 0.51, DH/rd (z = 0.70) = 21.22 ± 1.20, fσ8 (z = 0.70) = 0.43 ± 0.05, and DM/rd (z = 0.845) = 18.90 ± 0.78, DH/rd (z = 0.845) = 20.91 ± 2.86, fσ8 (z = 0.845) = 0.30 ± 0.08. Combined with BAO measurements including those from the eBOSS DR16 QSO and Lyman-α sample, our measurement has raised the significance level of a non-zero ωΛ to ∼11σ. The data product of this work is publicly available at https://github.com/icosmology/eBOSS_DR16_LRGxELG and https://www.sdss.org/science/final-bao-and-rsd-measurements/.

Original languageEnglish (US)
Pages (from-to)33-52
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume504
Issue number1
DOIs
StatePublished - Jun 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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