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

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

doi:10.1093/mnras/stab849

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

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Hou, Jiamin
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Zhao, G.-B., Wang, Y., Taruya, A., Zhang, W., Gil-Marín, H., de Mattia, A., et al. (2021). The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: a multitracer analysis in Fourier space for measuring the cosmic structure growth and expansion rate. Monthly Notices of the Royal Astronomical Society, 504(1), 33-52. doi:10.1093/mnras/stab849.

Cite as: https://hdl.handle.net/21.11116/0000-0009-29D4-A

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 z_eff = 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, D_M/r_d (z = 0.70) = 17.96 ± 0.51, D_H/r_d (z = 0.70) = 21.22 ± 1.20, fσ₈ (z = 0.70) = 0.43 ± 0.05, and D_M/r_d (z = 0.845) = 18.90 ± 0.78, D_H/r_d (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 Ω_Λ 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/.