Very weak lensing in the CFHTLS wide: cosmology from cosmic shear in the linear regime
نویسندگان
چکیده
منابع مشابه
Weak lensing survey of galaxy clusters in the CFHTLS Deep
Aims. We present a weak lensing search of galaxy clusters in the 4 deg2 of the CFHT Legacy Survey Deep. This work aims at building a mass-selected sample of clusters with well controlled selection effects. This present survey is a preliminary step toward a full implementation in the forthcoming 170 deg2 of the CFHTLS Wide survey. Methods. We use the deep i band images observed under subarcsecon...
متن کاملWeak lensing and cosmology
Recently, it has been shown that it is possible to reconstruct the projected mass distribution of a cluster from weak lensing provided that both the geometry of the universe and the probability distribution of galaxy redshifts are known; actually, when additional photometric data are taken to be available, the galaxy redshift distribution could be determined jointly with the cluster mass from t...
متن کاملWeak Lensing and Cosmology
We explore the dependence of weak lensing phenomena on the background cosmology. We rst generalise the relation between P (!), the angular power spectrum of the distortion, and the power spectrum of density uctuations to nonat cosmologies. We then compute P for various illustrative models. A useful cosmological discriminator is the growth of P with source redshift which is much stronger in low ...
متن کاملCFHTLS⋆ weak-lensing constraints on the neutrino masses
Context. Oscillation experiments yield strong evidence that at least some neutrinos are massive. As a hot dark-matter component, massive neutrinos would modify the expansion history of the Universe as well as the evolution of cosmological perturbations, differently from cold dark matter or dark energy. Aims. We use the latest release of CFHTLS cosmic-shear data to constrain the sum of the masse...
متن کاملCosmology with weak lensing surveys.
Weak gravitational lensing is responsible for the shearing and magnification of the images of high-redshift sources due to the presence of intervening mass. Since the lensing effects arise from deflections of the light rays due to fluctuations of the gravitational potential, they can be directly related to the underlying density field of the large-scale structures. Weak gravitational surveys ar...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20078522