The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the emission line galaxy sample from the anisotropic power spectrum between redshift 0.6 and 1.1

Abstract

We analyse the large-scale clustering in Fourier space of emission line galaxies (ELG) from the Data Release 16 of the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey. The ELG sample contains 173,736 galaxies covering 1,170 square degrees in the redshift range 0.6 < z < 1.1. We perform a BAO measurement from the post-reconstruction power spectrum monopole, and study redshift space distortions (RSD) in the first three even multipoles. Photometric variations yield fluctuations of both the angular and radial survey selection functions. Those are directly inferred from data, imposing integral constraints which we model consistently. The full data set has only a weak preference for a BAO feature (1.4σ). At the effective redshift zeff = 0.845 we measure $D_{\rm V}(z_{\rm eff})/r_{\rm drag} = 18.33_{-0.62}^{+0.57}$, with DV the volume-averaged distance and rdrag the comoving sound horizon at the drag epoch. In combination with the RSD measurement, at zeff = 0.85 we find $f\sigma _8(z_{\rm eff}) = 0.289_{-0.096}^{+0.085}$, with f the growth rate of structure and σ8 the normalisation of the linear power spectrum, $D_{\rm H}(z_{\rm eff})/r_{\rm drag} = 20.0_{-2.2}^{+2.4}$ and DM(zeff)/rdrag = 19.17 ± 0.99 with DH and DM the Hubble and comoving angular distances, respectively. These results are in agreement with those obtained in configuration space, thus allowing a consensus measurement of fσ8(zeff) = 0.315 ± 0.095, $D_{\rm H}(z_{\rm eff})/r_{\rm drag} = 19.6_{-2.1}^{+2.2}$ and DM(zeff)/rdrag = 19.5 ± 1.0. This measurement is consistent with a flat ΛCDM model with Planck parameters.

Baryon acoustic oscillations in the projected cross-correlation function between the eBOSS DR16 quasars and photometric galaxies from the DESI Legacy Imaging Surveys

“…We also compare our measurements of D M with other measurements using different tracers and methods, as shown in Fig. 21 ELG using BAO + RSD 15 (Tamone et al 2020;de Mattia et al 2021), eBOSS QSO using BAO only (Neveux et al 2020;Hou et al 2021), and eBOSS Ly α forests (du Mas des Bourboux et al 2020) using BAO from the autocorrelation Ly α/Ly α (dark red), crosscorrelation Ly α/quasar (light red), and the combined measurement (red). This latest example shows the gain in precision on the combined measurement from auto-and cross-correlation.…”

The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the luminous red galaxy sample from the anisotropic correlation function between redshifts 0.6 and 1

“…The BAO and RSD constraints from the quasar sample are presented by Hou et al (2020) in configuration space and by Neveux & Burtin (2020) in Fourier space. The clustering from the ELG sample is described by de Mattia et al (2020) in Fourier space and by Amelie et al (2020) in configuration space. Finally, a series of articles describes the simulations used to test the different methodologies for each tracer.…”

Gopakumar-Vafa hierarchies in winding inflation and uplifts

“…the very recent results of [5]), and baryon acoustic oscillation (BAO) measurements (see e.g. [6]), has so far provided increasing evidence for the ΛCDM cosmological standard model. In particular, this includes support for a concurrent late-time accelerating expansion of the universe compatible with a description by de Sitter (dS) space with a very small positive cosmological constant (c.c.)…”