Measurement of baryon acoustic oscillation correlations at<i>z</i> = 2.3 with SDSS DR12 Ly<i>α</i>-Forests
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No Canadian affiliation. An affiliation-only frame — the usual design — would never have seen this work. It is one of the works that make the case for inverting the frame.
Machine scores (provisional)
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- Teacher spread
- 0.187 · how far apart the two teachers sit on this one work
- Validation status
score_only:v0-immature-baseline· verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it
Abstract
Here, we use flux-transmission correlations in Ly alpha 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 to 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 (DHDM0.3)-D-0.7/r(d) = 13.94 +/- 0.35. This value is 1.028 +/- 0.026 times the prediction of the flat-Lambda CDM 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-Lambda CDM density parameters to be Omega(M) = 0.296 +/- 0.029, Omega(Lambda) = 0.699 +/- 0.100 and Omega(k) = -0.002 +/- 0.119.
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The record
- Venue
- Astronomy and Astrophysics
- Topic
- Galaxies: Formation, Evolution, Phenomena
- Field
- Physics and Astronomy
- Canadian institutions
- —
- Funders
- Lawrence Berkeley National LaboratoryHigh Energy PhysicsAgence Nationale de la RechercheYork UniversityScience and Technology Facilities CouncilCarnegie Mellon UniversityOffice of ScienceJohns Hopkins UniversityCollege of Engineering, Michigan State UniversityHarvard UniversityOhio State UniversityNational Science FoundationUniversity of WashingtonAlfred P. Sloan FoundationNew Mexico State UniversityUniversity of PortsmouthVanderbilt UniversityYale UniversityUniversity of ArizonaPrinceton UniversityBrookhaven National LaboratoryU.S. Department of Energy
- Keywords
- Cosmic microwave backgroundPhysicsRedshiftAstrophysicsQuasarHubble's lawBaryonBaryon acoustic oscillationsSkyReionizationCorrelation function (quantum field theory)Cosmic background radiationAnisotropyGalaxyOptics
- Has abstract in OpenAlex
- yes