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(2021)
摘要
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., fσ
8
= 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, fσ
8
(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, fσ
8
(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/.
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关键词
(cosmology:) cosmological parameters,(cosmology:) large-scale structure of Universe,cosmology: observations,(cosmology:) dark energy
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