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Baryon acoustic oscillations from the complete SDSS-III Lyα-quasar cross-correlation function at z = 2.4

Journal Article · · Astronomy and Astrophysics
 [1];  [1];  [2];  [3];  [4];  [1];  [5];  [6];  [1];  [6];  [7];  [8];  [9];  [10];  [11];  [2];  [11];  [12];  [2];  [13] more »;  [14];  [15];  [16];  [17];  [1] « less
  1. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  2. Aix Marseille Univ., Marseille (France). Lab. d'Astrophysique de Marseille (LAM)
  3. CNRS/IN2P3. Univ. Paris (France). Observatoire de Paris. AstroParticule et Cosmologie (APC)
  4. Univ. Pierre et Marie Curie, Paris (France)
  5. Univ. Paris-Saclay, Gif-sur-Yvette (France); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Physics and Astronomy
  7. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); King's College London (United Kingdom). Dept. of Physics and Astronomy
  9. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  10. Institucio Catalana de Recerca i Estudis Avancats, Barcelona, Catalonia (Spain); Univ. de Barcelona, Barcelona, Catalonia (Spain). Inst. de Ciencies del Cosmos
  11. Univ. Paris (France). Inst. d'Astrophysique de Paris
  12. Univ. de Barcelona, Barcelona, Catalonia (Spain). Inst. de Ciencies del Cosmos
  13. Univ. of Edinburgh, Scotland (United Kingdom). The Royal Observatory
  14. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  15. 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
  16. Brookhaven National Lab. (BNL), Upton, NY (United States)
  17. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy
+ Show Author Affiliations

We present a measurement of baryon acoustic oscillations (BAO) in the cross-correlation of quasars with the Lyα-forest flux-transmission at a mean redshift z = 2.40. The measurement uses the complete SDSS-III data sample: 168,889 forests and 234,367 quasars from the SDSS Data Release DR12. In addition to the statistical improvement on our previous study using DR11, we have implemented numerous improvements at the analysis level allowing a more accurate measurement of this cross-correlation. We also developed the first simulations of the cross-correlation allowing us to test different aspects of our data analysis and to search for potential systematic errors in the determination of the BAO peak position. We measure the two ratios DH(z = 2.40)=rd = 9.01 ± 0.36 and DM(z = 2.40)=rd = 35.7 ±1.7, where the errors include marginalization over the non-linear velocity of quasars and the metal - quasar cross-correlation contribution, among other effects. These results are within 1.8σ of the prediction of the flat-ΛCDM model describing the observed CMB anisotropies.We combine this study with the Lyα-forest auto-correlation function (Bautista et al. 2017), yielding DH(z = 2.40)=rd = 8.94 ± 0.22 and DM(z = 2.40)=rd = 36.6 ± 1.2, within 2.3σ of the same flat-ΛCDM model.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
SC0012704
OSTI ID:
1377365
Report Number(s):
BNL--114215-2017-JA
Journal Information:
Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 608; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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UV Background Fluctuations and Three-Point Correlations in the Large Scale Clustering of the Lyman-alpha Forest text January 2019
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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BAO
Lya-forest
baryon acoustic oscillations
cosmology
dark energy
large scale structure
quasar