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Title: Baryon acoustic oscillations in the Lyα forest of BOSS DR11 quasars

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [8];  [9];  [2];  [2];  [5];  [10];  [11];  [6];  [12];  [13];  [14];  [15] more »;  [4];  [5];  [16];  [17];  [9];  [18];  [19];  [12];  [4];  [20];  [20];  [21];  [22];  [6];  [23];  [24];  [4];  [25] « less
  1. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France); Federal Inst. of Technology, Lausanne (Switzerland). Astrophysics Lab.
  2. CNRS/IN2P3. Univ. Paris (France). Observatoire de Paris. AstroParticule et Cosmologie (APC)
  3. CNRS/IN2P3. Univ. Paris (France). Observatoire de Paris. AstroParticule et Cosmologie (APC); Observatorio Nacional, Rio de Janeiro (Brazil); Institutional e-Astronomy Lab., Rio de Janeiro (Brazil)
  4. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
  5. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Brookhaven National Lab. (BNL), Upton, NY (United States)
  8. Max Planck Inst. for Astronomie, Heidelberg (Germany)
  9. Univ. of Portsmouth (United Kingdom). Inst. of Cosmology and Gravitation
  10. Inst. for Advanced Study, Princeton, NJ (United States)
  11. Apache Point Observatory, Sunspot, NM (United States)
  12. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Physics and Astronomy
  13. Harvard Univ., Cambridge, MA (United States). Harvard-Smithsonian Center for Astrophysics
  14. Univ of Barcelona, Barcelona (Spain). Inst. de Ciencies del Cosmos
  15. Federal Inst. of Technology, Lausanne (Switzerland). Astrophysics Lab.; Aix-Marseille Univ., and CNRS/LAM, Marseille (France)
  16. Catalan Inst. for Research and Advanced Studies, Barcelona, Catalonia (Spain); Univ of Barcelona, Barcelona (Spain). Inst. de Ciencies del Cosmos
  17. Univ. of Wyoming, Laramie, WY (United States). Dept. of Physics and Astronomy
  18. Univ. of Paris, Paris (France). Inst. d'Astrophysique de Paris
  19. Carnegie Mellon Univ., Pittsburgh, PA (United States). Bruce and Astrid McWilliams Center for Cosmology
  20. Univ. of Paris, Paris (France). Inst. d'Astrophysique de Paris
  21. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Drexel Univ., Philadelphia, PA (United States). Dept. of Physics
  22. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France); Sejong Univ., Seoul (Korea, Republic of). Dept. of Astronomy and Space Science
  23. Pennsylvania State Univ., University Park, PA (United States). Dept of Astronomy and Astrophysics; Pennsylvania State Univ., University Park, PA (United States). Inst. for Gravitation and the Cosmos
  24. The Ohio State Univ., Columbus, OH (United States). Dept. of Astronomy
  25. Univ. of Chicago, IL (United States). Dept. of Astronomy and Astrophysics and the Enrico Fermi Inst.
+ Show Author Affiliations

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)$$+2.8\atop{-1.2}$$(2σ) and DH/rd = 9.18 ± 0.28(1σ) ± 0.6(2σ) where DH = c/H. The optimal combination, ~D$$0.7\atop{H}$$ D$0.3\atop{A}/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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC00112704; AC02-98CH10886; ANR-08-BLAN-0222; ANR-12- BS05-0015-01; PIIF-GA- 2011-301665
OSTI ID:
1335435
Report Number(s):
BNL-112096-2016-JA; KA2301020
Journal Information:
Astronomy and Astrophysics, Vol. 574; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 607 works
Citation information provided by
Web of Science

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79 ASTRONOMY AND ASTROPHYSICS
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