The WiggleZ Dark Energy Survey: Joint measurements of the expansion and growth history at z < 1
In: Monthly Notices of the Royal Astronomical Society, 2015
Online
academicJournal
Zugriff:
We perform a joint determination of the distance-redshift relation and cosmic expansion rate at redshifts z = 0.44, 0.6 and 0.73 by combining measurements of the baryon acoustic peak and Alcock-Paczynski distortion from galaxy clustering in the WiggleZ Dark Energy Survey, using a large ensemble of mock catalogues to calculate the covariance between the measurements. We find that D A(z) = (1205 ± 114, 1380 ± 95, 1534 ± 107)Mpc and H(z) = (82.6 ± 7.8, 87.9 ± 6.1, 97.3 ± 7.0)kms -1Mpc -1 at these three redshifts. Further combining our results with other baryon acoustic oscillation and distant supernovae data sets, we use a Monte Carlo Markov Chain technique to determine the evolution of the Hubble parameter H(z) as a stepwise function in nine redshift bins of width Δz = 0.1, also marginalizing over the spatial curvature. Our measurements of H(z), which have precision better than 7 per cent in most redshift bins, are consistent with the expansion history predicted by a cosmological constant dark energy model, in which the expansion rate accelerates at redshift z < 0.7.
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The WiggleZ Dark Energy Survey: Joint measurements of the expansion and growth history at z < 1
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Autor/in / Beteiligte Person: | Blake, Chris ; Brough, Sarah ; Colless, Matthew ; Contreras, Carlos ; Couch, Warrick ; Croom, Scott M ; Croton, Darren ; Davis, Tamara ; Drinkwater, Michael John ; Forster, Karl ; Gilbank, David ; Sharp, Robert ; Madore, Barry ; Wyder, Ted |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society, 2015 |
Veröffentlichung: | Blackwell Publishing Ltd, 2015 |
Medientyp: | academicJournal |
ISSN: | 0035-8711 (print) |
DOI: | 10.1111/j.1365-2966.2012.21473.x |
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