Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-13
Astronomy and Astrophysics
Astrophysics
11 pages, 8 figures, Submitted to A&A
Scientific paper
10.1051/0004-6361:20010058
We observed with the camera FORS1 on the VLT (UT1, ANTU) 50 randomly selected fields and analyzed the cosmic shear inside circular apertures with diameter ranging from 0.5 to 5.0 arc-minutes. The images were obtained in optimal conditions by using the Service Observing proposed by ESO on the VLT, which enabled us to get a well-defined and homogeneous set of data. The 50 fields cover a 0.65 square-degrees area spread over more than 1000 square-degrees which provides a sample ideal for minimizing the cosmic variance. Using the same techniques as in Van Waerbeke et al. 2000, we measured the cosmic shear signal and investigated the systematics of the VLT sample. We find a significant excess of correlations between galaxy ellipticities on those angular scales. The amplitude and the shape of the correlation as function of angular scale are remarkably similar to those reported so far. Using our combined VLT and CFHT data and adding the results published by other teams we put the first joint constraints on Omega_0 and sigma_8 using cosmic shear surveys. From a deduced average of the redshift of the sources the combined data are consistent with sigma_8\simeq (0.59 \pm 0.03) Omega_0^{-0.47} (for a CDM power spectrum and $\Gamma=0.21$), in excellent agreement with the cosmological constraints obtained from the local cluster abundance.
Bernardeau Francis
Erben Thomas
Fort Bernard
Jain Bhuvnesh
Maoli Roberto
No associations
LandOfFree
Cosmic Shear Analysis in 50 Uncorrelated VLT Fields. Implications for Omega_0, sigma_8 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cosmic Shear Analysis in 50 Uncorrelated VLT Fields. Implications for Omega_0, sigma_8, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic Shear Analysis in 50 Uncorrelated VLT Fields. Implications for Omega_0, sigma_8 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-381240