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

Blake, Chris and Forster, Karl and Martin, D. Christopher and Wyder, Ted K. (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). pp. 1725-1735. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20120221-113953988

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-2966.2011.19606.xDOIUNSPECIFIED
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2011.19606.x/abstractPublisherUNSPECIFIED
Additional Information:© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 August 6. Received 2011 August 4; in original form 2011 July 1. Article first published online: 4 Oct. 2011. We thank the anonymous referee for helpful comments. CB acknowledges useful discussions with Berian James, Juliana Kwan and Arman Shafieloo. We acknowledge financial support from the Australian Research Council through Discovery Project grants DP0772084 and DP1093738 and Linkage International travel grant LX0881951. SC acknowledges the support of an Australian Research Council QEII Fellowship. MJD and TMD thank the Gregg Thompson Dark Energy Travel Fund for financial support. GALEX (the Galaxy Evolution Explorer) is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology.We thank the Anglo-Australian Telescope Allocation Committee for supporting theWiggleZ survey over nine semesters, and we are very grateful for the dedicated work of the staff of the Australian Astronomical Observatory in the development and support of the AAOmega spectrograph, and the running of the AAT.
Group:Space Astrophysics Laboratory
Funders:
Funding AgencyGrant Number
Australian Research CouncilDP0772084
Australian Research Council DP1093738
Linkage International Travel GrantLX0881951
Australian Research Council QEII FellowshipUNSPECIFIED
Gregg Thompson Dark Energy Travel FundUNSPECIFIED
NASAUNSPECIFIED
Centre National d’Etudes Spatiales of FranceUNSPECIFIED
Korean Ministry of Science and TechnologyUNSPECIFIED
Anglo-Australian Telescope (AAT) Allocation CommitteeUNSPECIFIED
Australian Astronomical Observatory (AAO)UNSPECIFIED
Subject Keywords: surveys; dark energy; distance scale
Record Number:CaltechAUTHORS:20120221-113953988
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120221-113953988
Official Citation:Blake, C., Glazebrook, K., Davis, T. M., Brough, S., Colless, M., Contreras, C., Couch, W., Croom, S., Drinkwater, M. J., Forster, K., Gilbank, D., Gladders, M., Jelliffe, B., Jurek, R. J., Li, I.-h., Madore, B., Martin, D. C., Pimbblet, K., Poole, G. B., Pracy, M., Sharp, R., Wisnioski, E., Woods, D., Wyder, T. 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: 1725–1735. doi: 10.1111/j.1365-2966.2011.19606.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29389
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:21 Feb 2012 21:11
Last Modified:28 Aug 2016 20:28

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