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

Abstract

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 D H(z = 2.40)=r d = 9.01 ± 0.36 and D M(z = 2.40)=r d = 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 D H(z = 2.40)=r d = 8.94 ± 0.22 and D M(z = 2.40)=r d = 36.6 ± 1.2,more » within 2.3σ of the same flat-ΛCDM model.« less

Authors:
 [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
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1377365
Report Number(s):
BNL-114215-2017-JA
Journal ID: ISSN 0004-6361
Grant/Contract Number:
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 608; Journal Issue: 12; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology; dark energy; baryon acoustic oscillations; BAO; quasar; Lya-forest; large scale structure

Citation Formats

du Mas des Bourboux, Helion, Le Goff, Jean-Marc, Blomqvist, Michael, Busca, Nicolas G., Guy, Julien, Rich, James, Yeche, Christophe, Bautista, Julian E., Burtin, Etienne, Dawson, Kyle S., Eisenstein, Daniel J., Font-Ribera, Andreu, Kirkby, David, Miralda-Escude, Jordi, Noterdaeme, Pasquier, Paris, Isabelle, Petitjean, Patrick, Perez-Rafols, Ignasi, Pieri, Matthew M., Ross, Nicholas P., Schlegel, David J., Schneider, Donald P., Slosar, Anze, Weinberg, David H., and Zarrouk, Pauline. Baryon acoustic oscillations from the complete SDSS-III Lyα-quasar cross-correlation function at z = 2.4. United States: N. p., 2017. Web. doi:10.1051/0004-6361/201731731.
du Mas des Bourboux, Helion, Le Goff, Jean-Marc, Blomqvist, Michael, Busca, Nicolas G., Guy, Julien, Rich, James, Yeche, Christophe, Bautista, Julian E., Burtin, Etienne, Dawson, Kyle S., Eisenstein, Daniel J., Font-Ribera, Andreu, Kirkby, David, Miralda-Escude, Jordi, Noterdaeme, Pasquier, Paris, Isabelle, Petitjean, Patrick, Perez-Rafols, Ignasi, Pieri, Matthew M., Ross, Nicholas P., Schlegel, David J., Schneider, Donald P., Slosar, Anze, Weinberg, David H., & Zarrouk, Pauline. Baryon acoustic oscillations from the complete SDSS-III Lyα-quasar cross-correlation function at z = 2.4. United States. doi:10.1051/0004-6361/201731731.
du Mas des Bourboux, Helion, Le Goff, Jean-Marc, Blomqvist, Michael, Busca, Nicolas G., Guy, Julien, Rich, James, Yeche, Christophe, Bautista, Julian E., Burtin, Etienne, Dawson, Kyle S., Eisenstein, Daniel J., Font-Ribera, Andreu, Kirkby, David, Miralda-Escude, Jordi, Noterdaeme, Pasquier, Paris, Isabelle, Petitjean, Patrick, Perez-Rafols, Ignasi, Pieri, Matthew M., Ross, Nicholas P., Schlegel, David J., Schneider, Donald P., Slosar, Anze, Weinberg, David H., and Zarrouk, Pauline. Tue . "Baryon acoustic oscillations from the complete SDSS-III Lyα-quasar cross-correlation function at z = 2.4". United States. doi:10.1051/0004-6361/201731731.
@article{osti_1377365,
title = {Baryon acoustic oscillations from the complete SDSS-III Lyα-quasar cross-correlation function at z = 2.4},
author = {du Mas des Bourboux, Helion and Le Goff, Jean-Marc and Blomqvist, Michael and Busca, Nicolas G. and Guy, Julien and Rich, James and Yeche, Christophe and Bautista, Julian E. and Burtin, Etienne and Dawson, Kyle S. and Eisenstein, Daniel J. and Font-Ribera, Andreu and Kirkby, David and Miralda-Escude, Jordi and Noterdaeme, Pasquier and Paris, Isabelle and Petitjean, Patrick and Perez-Rafols, Ignasi and Pieri, Matthew M. and Ross, Nicholas P. and Schlegel, David J. and Schneider, Donald P. and Slosar, Anze and Weinberg, David H. and Zarrouk, Pauline},
abstractNote = {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.},
doi = {10.1051/0004-6361/201731731},
journal = {Astronomy and Astrophysics},
number = 12,
volume = 608,
place = {United States},
year = {Tue Aug 08 00:00:00 EDT 2017},
month = {Tue Aug 08 00:00:00 EDT 2017}
}

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  • In this paper, we present distance scale measurements from the baryon acoustic oscillation signal in the constant stellar mass and low-redshift sample samples from the Data Release 12 of the Baryon Oscillation Spectroscopic Survey. The total volume probed is 14.5 Gpc 3, a 10 per cent increment from Data Release 11. From an analysis of the spherically averaged correlation function, we infer a distance to z = 0.57 of D V(z)rmore » $$fid\atop{d}$$ /r d = 2028 ± 21 Mpc and a distance to z = 0.32 of V(z)r$$fid\atop{d}$$ /r d = 1264 ± 22 Mpc assuming a cosmology in which r$$fid\atop{d}$$ = 147.10 Mpc. From the anisotropic analysis, we find an angular diameter distance to z = 0.57 of D A(z)r$$fid\atop{d}$$ /r d = 1401 ± 21 Mpc and a distance to z = 0.32 of 981 ± 20 Mpc, a 1.5 and 2.0 per cent measurement, respectively. The Hubble parameter at z = 0.57 is H(z)r d/r$$fid\atop{d}$$ = 100.3 ± 3.7kms -1 Mpc -1 and its value at z=0.32 is 79.2±5.6 kms -1 Mpc -1 , a 3.7 and 7.1 per cent measurement, respectively. In conclusion, these cosmic distance scale constraints are in excellent agreement with aΛcold dark matter model with cosmological parameters released by the recent Planck 2015 results.« less
  • We measure the large-scale cross-correlation of quasars with the Lyα forest absorption, using over 164,000 quasars from Data Release 11 of the SDSS-III Baryon Oscillation Spectroscopic Survey. We extend the previous study of roughly 60,000 quasars from Data Release 9 to larger separations, allowing a measurement of the Baryonic Acoustic Oscillation (BAO) scale along the line of sight c/(H(z = 2.36)r{sub s}) = 9.0±0.3 and across the line of sight D{sub A}(z = 2.36)/r{sub s} = 10.8±0.4, consistent with CMB and other BAO data. Using the best fit value of the sound horizon from Planck data (r{sub s} = 147.49 Mpc),more » we can translate these results to a measurement of the Hubble parameter of H(z = 2.36) = 226±8 km s{sup −1} Mpc{sup −1} and of the angular diameter distance of D{sub A}(z = 2.36) = 1590±60 Mpc. The measured cross-correlation function and an update of the code to fit the BAO scale (baofit) are made publicly available.« less
  • Here, we use flux-transmission correlations in Lyα forests to measure the imprint of baryon acoustic oscillations (BAO). The study uses spectra of 157,783 quasars in the redshift range 2.1 ≤ z ≤ 3.5 from the Sloan Digital Sky Survey (SDSS) Data Release 12 (DR12). Besides the statistical improvements on our previous studies using SDSS DR9 and DR11, we have implemented numerous improvements in the analysis procedure, allowing us to construct a physical model of the correlation function and to investigate potential systematic errors in the determination of the BAO peak position. The Hubble distance, D H = c/H(z), relative tomore » the sound horizon is D H(z = 2.33)/r d = 9.07 ± 0.31. The best-determined combination of comoving angular-diameter distance, D M, and the Hubble distance is found to be D 0.7 HD 0.3 M/r d = 13.94 ± 0.35. This value is 1.028 ± 0.026 times the prediction of the flat- ΛCDM model consistent with the cosmic microwave background (CMB) anisotropy spectrum. The errors include marginalization over the effects of unidentified high-density absorption systems and fluctuations in ultraviolet ionizing radiation. Independently of the CMB measurements, the combination of our results and other BAO observations determine the open-ΛCDM density parameters to be Ω M = 0.296 ± 0.029, Ω Λ = 0.699 ± 0.100 and Ω k = –0.002 ± 0.119.« less
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  • Here, we present measurements of the Baryon Acoustic Oscillation (BAO) scale in redshift-space using the clustering of quasars. We consider a sample of 147,000 quasars from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) distributed over 2044 square degrees with redshifts 0.8 < z < 2.2 and measure their spherically-averaged clustering in both configuration and Fourier space. Our observational dataset and the 1400 simulated realizations of the dataset allow us to detect a preference for BAO that is greater than 2.5σ . We determine the spherically averaged BAO distance to z = 1.52 to 4.4 per cent precision: D V (zmore » = 1:52) = 3855 170 (r d/r d,fid) Mpc. This is the first time the location of the BAO feature has been measured between redshifts 1 and 2. Our result is fully consistent with the prediction obtained by extrapolating the Planck flat CDM best-fit cosmology. All of our results are consistent with basic large-scale structure (LSS) theory, confirming quasars to be a reliable tracer of LSS, and provide a starting point for numerous cosmological tests to be performed with eBOSS quasar samples. We combine our result with previous, independent, BAO distance measurements to construct an updated BAO distance-ladder. Bu using these BAO data alone and marginalizing over the length of the standard ruler, we find Ω Λ > 0 at 6.5σ significance when testing a CDM model with free curvature.« less
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