|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity | | Morag Scrimgeour
; Tamara Davis
; Chris Blake
; J. Berian James
; Gregory Poole
; Lister Staveley-Smith
; Sarah Brough
; Matthew Colless
; Carlos Contreras
; Warrick Couch
; Scott Croom
; Darren Croton
; Michael J. Drinkwater
; Karl Forster
; David Gilbank
; Mike Gladders
; Karl Glazebrook
; Ben Jelliffe
; Russell J. Jurek
; I-hui Li
; Barry Madore
; Chris Martin
; Kevin Pimbblet
; Michael Pracy
; Rob Sharp
; Emily Wisnioski
; David Woods
; Ted Wyder
; Howard Yee
; | | Date: |
30 May 2012 | | 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 200,000 blue galaxies in a cosmic volume
of ~1 (Gpc/h)^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
1%, or equivalently the fractal dimension of the sample is within 1% of D_2=3,
at radii larger than 71 pm 8 Mpc/h at z~0.2, 70 pm 5 Mpc/h at z~0.4, 81 pm 5
Mpc/h at z~0.6, and 75 pm 4 Mpc/h at z~0.8. We demonstrate the robustness of
our results against selection function effects, using a LCDM N-body simulation
and a suite of inhomogeneous fractal distributions. The results are in
excellent agreement with both the LCDM N-body simulation and an analytical LCDM
prediction. We can exclude a fractal distribution with fractal dimension below
D_2=2.97 on scales from ~80 Mpc/h up to the largest scales probed by our
measurement, ~300 Mpc/h, at 99.99% confidence. | | Source: | arXiv, 1205.6812 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER