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Baryon acoustic oscillations in the Lyαforest of BOSS DR11 quasars

Authors
Timothée Delubac,Julian E. Bautista
Nicolás G. Busca,James Rich,David Kirkby,Stephen Bailey,Andreu Font-Ribera,Anže Slosar,Khee-Gan Lee,Matthew M. Pieri,Jean-Christophe Hamilton,Éric Aubourg,Michael Blomqvist,Jo Bovy,J. Brinkmann,William Carithers,Kyle S. Dawson,Daniel J. Eisenstein,Satya Gontcho A Gontcho,Jean-Paul Kneib,J. -M. Le Goff,Daniel Margala,Jordi Miralda-Escudé,Adam D. Myers,Robert C. Nichol,Pasquier Noterdaeme,Ross O'Connell,Matthew D. Olmstead,Nathalie Palanque-Delabrouille,Isabelle Pâris,Patrick Petitjean,Nicholas P. Ross,Graziano Rossi,David J. Schlegel,Donald P. Schneider,David H. Weinberg,Christophe Yèche,Donald G. York,Julian Bautista,N. Busca,J. Rich,D. Kirkby,S. Bailey,Khee‐Gan Lee,Matthew Pieri,J.–Ch. Hamilton,É. Aubourg,W. Carithers,Kyle Dawson,Daniel Eisenstein,Satya Gontcho,Jean‐Paul Kneib,Jean-Marc Goff,Jordi Miralda‐Escudé,Adam Myers,Robert Nichol,P. Noterdaeme,Ross O’Connell,Matthew Olmstead,N. Palanque‐Delabrouille,Nicholas Ross,David Schlegel,Donald Schneider,David Weinberg
+62 authors
,Donald York
Published
Nov 12, 2014
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Abstract

We report a detection of the baryon acousticoscillation (BAO) feature in the flux-correlation function of the Lyα forest of high-redshift quasars with a statistical significance of five standard deviations. The study uses 137 562 quasars in the redshift range 2.1 ≤ z ≤ 3.5 from the data release 11 (DR11) of the Baryon Oscillation Spectroscopic Survey (BOSS) of SDSS-III. This sample contains three times the number of quasars used in previous studies. The measured position of the BAO peak determines the angular distance, DA(z = 2.34) and expansion rate, H(z = 2.34), both on a scale set by the sound horizon at the drag epoch, rd. We find DA/rd = 11.28 ± 0.65(1σ)+2.8-1.2 (2σ) and DH/rd = 9.18 ± 0.28(1σ) ± 0.6(2σ) where DH = c/H. The optimal combination, ~DH0.7DA0.3/rd is determined with a precision of ~2%. For the value rd = 147.4 Mpc, consistent with the cosmic microwave background power spectrum measured by Planck, we find DA(z = 2.34) = 1662 ± 96(1σ) Mpc and H(z = 2.34) = 222 ± 7(1σ) km s-1 Mpc-1. Tests with mock catalogs and variations of our analysis procedure have revealed no systematic uncertainties comparable to our statistical errors. Our results agree with the previously reported BAO measurement at the same redshift using the quasar-Lyα forest cross-correlation. The autocorrelation and cross-correlation approaches are complementary because of the quite different impact of redshift-space distortion on the two measurements. The combined constraints from the two correlation functions imply values of DA/rd that are 7% lower and 7% higher for DH/rd than the predictions of a flat ΛCDM cosmological model with the best-fit Planck parameters. With our estimated statistical errors, the significance of this discrepancy is ≈2.5σ.

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