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The clustering of the SDSS-IV extended baryon oscillation spectroscopic survey DR16 luminous red galaxy and emission-line galaxy samples: cosmic distance and structure growth measurements using multiple tracers in configuration space

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

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Comparat,  Johan
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Wang, Y., Zhao, G.-B., Zhao, C., Philcox, O. H. E., Alam, S., Tamone, A., et al. (2020). The clustering of the SDSS-IV extended baryon oscillation spectroscopic survey DR16 luminous red galaxy and emission-line galaxy samples: cosmic distance and structure growth measurements using multiple tracers in configuration space. Monthly Notices of the Royal Astronomical Society, 498(3), 3470-3483. doi:10.1093/mnras/staa2593.


Cite as: http://hdl.handle.net/21.11116/0000-0007-F73B-1
Abstract
We perform a multitracer analysis using the complete Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic Survey (eBOSS) DR16 luminous red galaxy (LRG) and the DR16 emission-line galaxy (ELG) samples in the configuration space, and successfully detect a cross-correlation between the two samples, and find the growth rate to be fσ8=0.342 ± 0.085 (∼25 per cent accuracy) from the cross-sample alone. We perform a joint measurement of the baryonic acoustic oscillation (BAO) and redshift space distortion (RSD) parameters at a single effective redshift of zeff = 0.77, using the autocorrelation and cross-correlation functions of the LRG and ELG samples, and find that the comoving angular diameter distance DM(zeff)/rd = 18.85 ± 0.38, the Hubble distance DH(zeff)/rd = 19.64 ± 0.57, and fσ8(zeff) = 0.432 ± 0.038, which is consistent with a ΛCDM model at 68 per cent CL. Compared to the single-tracer analysis on the LRG sample, the Figure of Merit of α, α, andfσ8 is improved by a factor of 1.11 in our multitracer analysis, and in particular, the statistical uncertainty of fσ8 is reduced by 11.6 per cent⁠.