Статья

The WiggleZ Dark Energy Survey: mapping the distance-redshift relation with baryon acoustic oscillations

Chris BlakeCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaEyal KazinCenter for Cosmology and Particle Physics, New York University, 4 Washington Place, New York, NY 10003, USAFlorian BeutlerInternational Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, AustraliaT. M. DavisSchool of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, AustraliaDavid Parkinson†School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, AustraliaSarah BroughAustralian Astronomical Observatory, PO Box 296 Epping, NSW 1710, AustraliaMatthew CollessAustralian Astronomical Observatory, PO Box 296 Epping, NSW 1710, AustraliaC. ContrerasCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaW. J. CouchCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaS. M. CroomSydney Institute for Astronomy School of Physics, University of Sydney NSW 2006 AustraliaDarren CrotonCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaM. J. Drinkwater†School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, AustraliaKarl FörsterCalifornia Institute of Technology, MC 278‐17, 1200 East California Boulevard, Pasadena, CA 91125, USAD. G. GilbankAstrophysics and Gravitation Group, Department of Physics and Astronomy, University of Waterloo, Waterloo, ON, N2L 3G1, CanadaM. D. GladdersDepartment of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis#N# Avenue, Chicago, IL 60637, USAKarl GlazebrookCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaBen JelliffeSydney Institute for Astronomy School of Physics, University of Sydney NSW 2006 AustraliaRussell J. JurekAustralia Telescope National Facility, CSIRO, Epping, NSW 1710, AustraliaI-hui LiCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaBarry F. MadoreObservatories of the Carnegie Institute of Washington, 813 Santa Barbara St, Pasadena, CA 91101, USAD. Christopher MartinCalifornia Institute of Technology, MC 278‐17, 1200 East California Boulevard, Pasadena, CA 91125, USAKevin A. PimbbletSchool of Physics Monash University Clayton Vic 3800 AustraliaGregory B. PooleCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaMichael PracyResearch School of Astronomy & Astrophysics, Australian National University, Weston Creek, ACT 2611, AustraliaR. SharpResearch School of Astronomy & Astrophysics, Australian National University, Weston Creek, ACT 2611, AustraliaEmily WisnioskiCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaDavid WoodsDepartment of Physics and Astronomy , University of British Columbia , 6224 Agricultural Road, Vancouver, BC V6T 1Z1, CanadaTed K. WyderCalifornia Institute of Technology, MC 278‐17, 1200 East California Boulevard, Pasadena, CA 91125, USAH. K. C. YeeDepartment of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto ON M5S 3H4, Canada

2011en

ABI

Аннотация

We present measurements of the baryon acoustic peak at redshifts z= 0.44, 0.6 and 0.73 in the galaxy correlation function of the final data set of the WiggleZ Dark Energy Survey. We combine our correlation function with lower redshift measurements from the 6-degree Field Galaxy Survey and Sloan Digital Sky Survey, producing a stacked survey correlation function in which the statistical significance of the detection of the baryon acoustic peak is 4.9σ relative to a zero-baryon model with no peak. We fit cosmological models to this combined baryon acoustic oscillation (BAO) data set comprising six distance–redshift data points, and compare the results with similar cosmological fits to the latest compilation of supernovae (SNe) and cosmic microwave background (CMB) data. The BAO and SNe data sets produce consistent measurements of the equation-of-state w of dark energy, when separately combined with the CMB, providing a powerful check for systematic errors in either of these distance probes. Combining all data sets we determine w=−1.03 ± 0.08 for a flat universe, consistent with a cosmological constant model. Assuming dark energy is a cosmological constant and varying the spatial curvature, we find Ωk=−0.004 ± 0.006.

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Идентификаторы

DOI: 10.1111/j.1365-2966.2011.19592.x

Цитирования и источники

Цитирований: 13Использованных источников: 0

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