The WiggleZ Dark Energy Survey: Measuring the cosmic expansion history using the Alcock-Paczynski test and distant supernovae

Blake, Chris, Glazebrook, Karl, Davis, Tamara M., Brough, Sarah, Colless, Matthew, Contreras, Carlos, Couch, Warrick, Croom, Scott, Drinkwater, Michael J., Forster, Karl, Gilbank, David, Gladders, Mike, Jelliffe, Ben, Jurek, Russell J., Li, I-hui, Madore, Barry, Martin, D. Christopher, Pimbblet, Kevin, Poole, Gregory B., Pracy, Michael, Sharp, Rob, Wisnioski, Emily, Woods, David, Wyder, Ted K. and Yee, H. K. C. (2011) The WiggleZ Dark Energy Survey: Measuring the cosmic expansion history using the Alcock-Paczynski test and distant supernovae. Monthly Notices of the Royal Astronomical Society, 418 3: 1725-1735. doi:10.1111/j.1365-2966.2011.19606.x


Author Blake, Chris
Glazebrook, Karl
Davis, Tamara M.
Brough, Sarah
Colless, Matthew
Contreras, Carlos
Couch, Warrick
Croom, Scott
Drinkwater, Michael J.
Forster, Karl
Gilbank, David
Gladders, Mike
Jelliffe, Ben
Jurek, Russell J.
Li, I-hui
Madore, Barry
Martin, D. Christopher
Pimbblet, Kevin
Poole, Gregory B.
Pracy, Michael
Sharp, Rob
Wisnioski, Emily
Woods, David
Wyder, Ted K.
Yee, H. K. C.
Title The WiggleZ Dark Energy Survey: Measuring the cosmic expansion history using the Alcock-Paczynski test and distant supernovae
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 2011-12-01
Year available 2011
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2011.19606.x
Open Access Status DOI
Volume 418
Issue 3
Start page 1725
End page 1735
Total pages 11
Place of publication Oxford, England, U.K.
Publisher Oxford University Press
Language eng
Abstract Astronomical observations suggest that today’s Universe is dominated by a dark energy of unknown physical origin. One of the most notable results obtained from many models is that dark energy should cause the expansion of the Universe to accelerate: but the expansion rate as a function of time has proved very difficult to measure directly. We present a new determination of the cosmic expansion history by combining distant supernovae observations with a geometrical analysis of large-scale galaxy clustering within the WiggleZ Dark Energy Survey, using the Alcock–Paczynski test to measure the distortion of standard spheres. Our result constitutes a robust and non-parametric measurement of the Hubble expansion rate as a function of time, which we measure with 10–15 per cent precision in four bins within the redshift range 0.1 < z < 0.9. We demonstrate, in a manner insensitive to the assumed cosmological model, that the cosmic expansion is accelerating. Furthermore, we find that this expansion history is consistent with a cosmological-constant dark energy.
Keyword Surveys
Dark energy
Distance scale
Digital Sky Survey
Redshift-Space Distortions
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP0772084
LX0881951
Institutional Status UQ
Additional Notes Accepted 2011 August 6. Received 2011 August 4; in original form 2011 July 1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2012 Collection
 
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