Статья

Baryon acoustic oscillations in the Ly<i>α</i>forest of BOSS DR11 quasars

Timothée DelubacCEA, Centre de Saclay, IRFU, 91191 Gif-sur-Yvette, FranceJulian BautistaDélégation Paris 7Nicolás G. BuscaAPC, Université Paris Diderot-Paris 7, CNRS/IN2P3, CEA, Observatoire de Paris, 10 rue A. Domon & L. Duquet, 75205 Paris, FranceJames RichCEA, Centre de Saclay, IRFU, 91191 Gif-sur-Yvette, FranceD. KirkbyDepartment of Physics and Astronomy, University of California, Irvine, CA 92697, USAS. BaileyLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAAndreu Font-RiberaLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAAnže SlosarBrookhaven National Laboratory, 2 Center Road, Upton, NY 11973, USAKhee‐Gan LeeMax-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, GermanyMatthew M. PieriInstitute of Cosmology and Gravitation, Dennis Sciama Building, University of Portsmouth, Portsmouth, PO1 3FX, UKJ.–Ch. HamiltonAPC, Université Paris Diderot-Paris 7, CNRS/IN2P3, CEA, Observatoire de Paris, 10 rue A. Domon & L. Duquet, 75205 Paris, FranceÉ. AubourgAPC, Université Paris Diderot-Paris 7, CNRS/IN2P3, CEA, Observatoire de Paris, 10 rue A. Domon & L. Duquet, 75205 Paris, FranceMichael BlomqvistDepartment of Physics and Astronomy, University of California, Irvine, CA 92697, USAJo BovyInstitute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USAJ. BrinkmannW. CarithersLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAKyle DawsonDepartment of Physics and Astronomy, University of Utah, 115 S 1400 E, Salt Lake City, UT 84112, USADaniel J. EisensteinHarvard-Smithsonian Center for Astrophysics, Harvard University, 60 Garden St., Cambridge, MA 02138, USASatya Gontcho A GontchoInstitut de Ciències del Cosmos, Universitat de Barcelona (UB-IEEC), 08028 Barcelona, Catalonia, SpainJean‐Paul KneibAix-Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, FranceJean-Marc Le GoffCEA, Centre de Saclay, IRFU, 91191 Gif-sur-Yvette, FranceDaniel MargalaDepartment of Physics and Astronomy, University of California, Irvine, CA 92697, USAJordi Miralda‐EscudéInstitució Catalana de Recerca i Estudis Avançats, Barcelona, Catalonia, SpainAdam D. MyersDepartment of Physics and Astronomy, University of Wyoming, Laramie, WY 82071, USARobert C. NicholInstitute of Cosmology and Gravitation, Dennis Sciama Building, University of Portsmouth, Portsmouth, PO1 3FX, UKP. NoterdaemeUniversité Paris 6 et CNRS, Institut d’Astrophysique de Paris, 98bis Bd Arago, 75014 Paris, FranceRoss O’ConnellBruce and Astrid McWilliams Center for Cosmology, Carnegie Mellon University, Pittsburgh, PA 15213, USAMatthew D. OlmsteadDepartment of Physics and Astronomy, University of Utah, 115 S 1400 E, Salt Lake City, UT 84112, USAN. Palanque‐DelabrouilleCEA, Centre de Saclay, IRFU, 91191 Gif-sur-Yvette, FranceIsabelle PârisUniversité Paris 6 et CNRS, Institut d’Astrophysique de Paris, 98bis Bd Arago, 75014 Paris, FrancePatrick PetitjeanUniversité Paris 6 et CNRS, Institut d’Astrophysique de Paris, 98bis Bd Arago, 75014 Paris, FranceNicholas P. RossDept. of Physics, Drexel University, 3141 Chestnut Street, Philiadelphia, PA 19104, USAGraziano RossiCEA, Centre de Saclay, IRFU, 91191 Gif-sur-Yvette, FranceDavid J. SchlegelLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USADonald P. SchneiderDepartment of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USADavid H. WeinbergDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USAChristophe YècheCEA, Centre de Saclay, IRFU, 91191 Gif-sur-Yvette, FranceDonald G. YorkDepartment of Astronomy and Astrophysics and the Enrico Fermi Institute, The University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois, 60615, USA

2014en

ABI

Аннотация

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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Идентификаторы

DOI: 10.1051/0004-6361/201423969

Цитирования и источники

Цитирований: 3Использованных источников: 0

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