Мақола

Baryon acoustic oscillations at <i>z</i> = 2.34 from the correlations of Ly<i>α</i> absorption in eBOSS DR14

Victoria de Sainte AgatheSorbonne Université, Université Paris Diderot, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies, LPNHE, 4 Place Jussieu, 75252 Paris, FranceChristophe BallandSorbonne Université, Université Paris Diderot, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies, LPNHE, 4 Place Jussieu, 75252 Paris, FranceHélion du Mas des BourbouxDepartment of Physics and Astronomy, University of Utah, 115 S. 1400 E., Salt Lake City, UT 84112 USANicolás G. BuscaSorbonne Université, Université Paris Diderot, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies, LPNHE, 4 Place Jussieu, 75252 Paris, FranceMichael BlomqvistAix Marseille Univ., CNRS, CNES, LAM, Marseille, FranceJulien GuyLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAJames RichIRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceAndreu Font-RiberaUniversity College London, Gower St, Kings Cross, London WC1E 6BT, UKMatthew M. PieriAix Marseille Univ., CNRS, CNES, LAM, Marseille, FranceJulian E. BautistaInstitute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UKKyle DawsonDepartment of Physics and Astronomy, University of Utah, 115 S. 1400 E., Salt Lake City, UT 84112 USAJean-Marc Le GoffIRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceAxel de la MacorraInstituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 70-264, DF 04510 México, MexicoNathalie Palanque-DelabrouilleIRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceWill J. PercivalDepartment of Physics and Astronomy, University of Waterloo, 200 University Ave. W., Waterloo, ON N2L 3G1, CanadaIgnasi Pérez-RàfolsAix Marseille Univ., CNRS, CNES, LAM, Marseille, FranceDonald P. SchneiderDepartment of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA, 16802, USAAnže SlosarBrookhaven National Laboratory, 2 Center Road, Upton, NY 11973, USAChristophe YècheIRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France

2019en

ABI

Аннотация

We measure the imprint of primordial baryon acoustic oscillations (BAOs) in the correlation function of Ly α 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 (Ly α ) region, we use Ly α absorption in the Lyman- β region of 56 154 spectra for the first time. We measure the Hubble distance, D H , and the comoving angular diameter distance, D M , relative to the sound horizon at the drag epoch r d at an effective redshift z = 2.34. Using a physical model of the correlation function outside the BAO peak, we find D H (2.34)/ r d = 8.86 ± 0.29 and D M (2.34)/ r d = 37.41 ± 1.86, within 1 σ 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-Ly α cross-correlation measurement presented in a companion paper, the BAO measurements at z = 2.35 are within 1.7 σ of the predictions of this model.

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DOI: 10.1051/0004-6361/201935638

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