Back to Search
Start Over
First cosmic shear results from the Canada-France-Hawaii Telescope Wide Synoptic Legacy Survey
- Source :
- The Astrophysical Journal, The Astrophysical Journal, 2006, 647, pp.116-127
- Publication Year :
- 2005
-
Abstract
- We present the first measurements of the weak gravitational lensing signal induced by the large scale mass distribution from data obtained as part of the ongoing Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). The data used in this analysis are from the Wide Synoptic Survey, which aims to image ~170 square degree in five filters. We have analysed ~22 deg2 (31 pointings) of i' data spread over two of the three survey fields. These data are of excellent quality and the results bode well for the remainder of the survey: we do not detect a significant `B'-mode, suggesting that residual systematics are negligible at the current level of accuracy. Assuming a Cold Dark Matter model and marginalising over the Hubble parameter h=[0.6,0.8], the source redshift distribution and systematics, we constrain sigma_8, the amplitude of the matter power spectrum. At a fiducial matter density Omega_m=0.3 we find sigma_8=0.85+-0.06. This estimate is in excellent agreement with previous studies. Combination of our results with those from the Deep component of the CFHTLS enables us to place a constraint on a constant equation of state for the dark energy, based on cosmic shear data alone. We find that w_0<br />Comment: Submitted to ApJ
- Subjects :
- Cold dark matter
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
law.invention
Telescope
symbols.namesake
law
0103 physical sciences
010303 astronomy & astrophysics
Weak gravitational lensing
Physics
COSMIC cancer database
010308 nuclear & particles physics
Matter power spectrum
Astrophysics (astro-ph)
Astronomy and Astrophysics
Redshift
Space and Planetary Science
symbols
Dark energy
[PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph]
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Hubble's law
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X and 15384357
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal, The Astrophysical Journal, 2006, 647, pp.116-127
- Accession number :
- edsair.doi.dedup.....2332fc62df0c362c4892f3464cb10fe6