Papers › The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: a multi-tracer...
The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: a multi-tracer analysis in Fourier space for measuring the cosmic structure growth and expansion rate
Gong-Bo Zhao, Yuting Wang, Atsushi Taruya, Weibing Zhang, Hector Gil-Marin, Arnaud de Mattia, Ashley J. Ross, Anand Raichoor, Cheng Zhao, Will J. Percival, Shadab Alam, Julian E. Bautista, Etienne Burtin, Chia-Hsun Chuang, Jiamin Hou, Kyle S. Dawson, Jean-Paul Kneib, Kazuya Koyama, Helion du Mas des Bourboux, Eva-Maria Mueller, Jeffrey A. Newman, John A. Peacock, Graziano Rossi, Vanina Ruhlmann-Kleider, Donald P. Schneider, Arman Shafieloo
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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 a 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 measurement 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 nonzero Ω_Λ to ∼11σ.
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