Baryon acoustic oscillations at z = 2.34 from the correlations of Lyα absorption in eBOSS DR14

By Victoria de Sainte Agathe, C. Balland, Hélion Marie du Mas des Bourboux, N. Busca, M. Blomqvist, J. Guy, J. Rich, A. Font-Ribera, M. Pieri, Julián Bautista and 9 more. Astronomy & Astrophysics, 2019

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We measure the imprint of primordial baryon acoustic oscillations (BAOs) in the correlation function of Lyα absorption in quasar spectra from the Baryon Oscillation Spectroscopic Survey (BOSS) and the extended BOSS (eBOSS) in Data Release 14 (DR14) of the Sloan Digital Sky Survey (SDSS)-IV. In addition to 179 965 spectra with absorption in the Lyman-α (Lyα) region, we use Lyα absorption in the Lyman-β region of 56 154 spectra for the first time. We measure the Hubble distance, DH, and the comoving angular diameter distance, DM, relative to the sound horizon at the drag epoch rd at an effective redshift z = 2.34. Using a physical model of the correlation function outside the BAO peak, we find DH(2.34)/rd = 8.86 ± 0.29 and DM(2.34)/rd = 37.41 ± 1.86, within 1σ from the flat-ΛCDM model consistent with CMB anisotropy measurements. With the addition of polynomial “broadband” terms, the results remain within one standard deviation of the CMB-inspired model. Combined with the quasar-Lyα cross-correlation measurement presented in a companion paper, the BAO measurements at z = 2.35 are within 1.7σ of the predictions of this model.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/26a54dd93d0c73fe8f93d669fcb717c9357da653

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Citations in the corpus

Limits on wCDM from the EFTofLSS with the PyBird code (2020, methodology): “When quoting BAO, we also include measurements at small redshift from 6DF [56] and SDSS DR7 MGS [57], as well as high redshift Lyman-α forest auto-correlation and crosscorrelation with quasars from eBOSS DR14 measurements [58, 59].”
The BAO+BBN take on the Hubble tension (2019, methodology): “This new result is not just driven by the idea to combine BAO and BBN data, but also by the role of recent BAO measurements inferred from Lyman-α data in the Data Release 14 (DR14) of the eBOSS survey [31, 33].”
The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations with Lyα Forests (2020, background): “The BAO scale was first measured in the Lyα autocorrelation function (Busca et al. 2013; Kirkby et al. 2013; Slosar et al. 2013; Delubac et al. 2015; Bautista et al. 2017; de Sainte Agathe et al. 2019), and then in the Lyα–quasar cross-correlation function (Font-Ribera et al. 2014; du Mas des Bourbo”
The Hubble tension in light of the Full-Shape analysis of Large-Scale Structure data (2020, methodology): “When quoting BAO, we also include measurements at small redshift from 6DF [73] and SDSS DR7 MGS [74], as well as high-redshift Lyman-α forest auto-correlation and cross-correlation with quasars from eBOSS DR14 measurements [75, 76] 7.”
A Simple Phenomenological Emergent Dark Energy Model can Resolve the Hubble Tension (2019, methodology): “In addition to these lower BAO measurement, a higher redshift BAO measurement which is derived from the cross-correlation of Lyα absorption and quasars in eBOSS DR14 was also used (Blomqvist et al. 2019; de Sainte Agathe et al. 2019).”
The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: BAO and RSD measurements from anisotropic clustering analysis of the quasar sample in configuration space between redshift 0.8 and 2.2 (2020, methodology): “We also show previous results from the SDSS main galaxy sample (MGS) for the distance measurement (Ross et al. 2015a) and growth rate measurement (Howlett et al. 2015), the constraints from BOSS DR12 LRG sample (Alam et al. 2017), and the combined constraints from eBOSS DR14 Lyα measurements (de Sai”
Baryon acoustic oscillations from the cross-correlation of Lyα absorption and quasars in eBOSS DR14 (2019, methodology): “7 combines these results with those from the Lyα autocorrelation function presented in a companion paper (de Sainte Agathe et al. 2019).”