The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity

Scrimgeour, Morag I., Davis, Tamara, Blake, Chris, James, J. Berian, Poole, Gregory B., Staveley-Smith, Lister, Brough, Sarah, Colless, Matthew, Contreras, Carlos, Couch, Warrick, Croom, Scott, Croton, Darren, Drinkwater, Michael J., Forster, Karl, Gilbank, David, Gladders, Mike, Glazebrook, Karl, Jelliffe, Ben, Jurek, Russell J., Li, I-hui, Madore, Barry, Martin, D. Christopher, Pimbblet, Kevin, Pracy, Michael, Sharp, Rob, Wisnioski, Emily, Woods, David, Wyder, Ted K. and Yee, H. K. C. (2012) The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity. Monthly Notices of the Royal Astronomical Society, 425 1: 116-134. doi:10.1111/j.1365-2966.2012.21402.x

Author Scrimgeour, Morag I.
Davis, Tamara
Blake, Chris
James, J. Berian
Poole, Gregory B.
Staveley-Smith, Lister
Brough, Sarah
Colless, Matthew
Contreras, Carlos
Couch, Warrick
Croom, Scott
Croton, Darren
Drinkwater, Michael J.
Forster, Karl
Gilbank, David
Gladders, Mike
Glazebrook, Karl
Jelliffe, Ben
Jurek, Russell J.
Li, I-hui
Madore, Barry
Martin, D. Christopher
Pimbblet, Kevin
Pracy, Michael
Sharp, Rob
Wisnioski, Emily
Woods, David
Wyder, Ted K.
Yee, H. K. C.
Total Author Count Override 29
Title The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2012-09
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2012.21402.x
Open Access Status DOI
Volume 425
Issue 1
Start page 116
End page 134
Total pages 19
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2013
Language eng
Formatted abstract
We have made the largest volume measurement to date of the transition to large-scale homogeneity in the distribution of galaxies. We use the WiggleZ survey, a spectroscopic survey of over 200000 blue galaxies in a cosmic volume of ∼1h -3Gpc 3. A new method of defining the 'homogeneity scale' is presented, which is more robust than methods previously used in the literature, and which can be easily compared between different surveys. Due to the large cosmic depth of WiggleZ (up to z = 1), we are able to make the first measurement of the transition to homogeneity over a range of cosmic epochs. The mean number of galaxies N(< r) in spheres of comoving radius r is proportional to r 3 within 1per cent, or equivalently the fractal dimension of the sample is within 1per cent of D 2 = 3, at radii larger than 71 ± 8h -1Mpc at z ∼ 0.2, 70 ± 5h -1Mpc at z ∼ 0.4, 81 ± 5h -1Mpc at z ∼ 0.6 and 75 ± 4h -1Mpc at z ∼ 0.8. We demonstrate the robustness of our results against selection function effects, using a Λ cold dark matter (ΛCDM) N-body simulation and a suite of inhomogeneous fractal distributions. The results are in excellent agreement with both the ΛCDM N-body simulation and an analytical ΛCDM prediction. We can exclude a fractal distribution with fractal dimension below D 2 = 2.97 on scales from ∼80h -1Mpc up to the largest scales probed by our measurement, ∼300 h -1Mpc, at 99.99per cent confidence.
Keyword Galaxies: statistics
Cosmology: observations
Largescale structure of Universe
Baryon Acoustic Oscillations
Digital Sky Survey
Galaxy Correlation Function
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2013 Collection
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Citation counts: TR Web of Science Citation Count  Cited 57 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 58 times in Scopus Article | Citations
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