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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/eBOSSDR16LRGxELG and https: //www. sdss. org/science/final-bao-and-rsd-measurements/.
Zhao et al. (Mon,) studied this question.