Breaking the degeneracy: Optimal use of three-point weak lensing statistics
نویسندگان
چکیده
منابع مشابه
Breaking the Degeneracy: Optimal Use of Third Order Weak Lensing Statistics
We study the optimal use of third order statistics in the analysis of weak lensing by large-scale structure. These higher order statistics have long been advocated as a powerful tool to break measured degeneracies between cosmological parameters. Using ray-tracing simulations, incorporating important survey features such as a realistic depth-dependent redshift distribution, we find that a joint...
متن کاملControlling intrinsic-shear alignment in three-point weak lensing statistics
Three-point weak lensing statistics provide cosmic information that complements two-point statistics. However, both statistics suffer from intrinsic-shear alignment, which is one of their limiting systematics. The nulling technique is a model-independent method developed to eliminate intrinsic-shear alignment at the two-point level. In this paper we demonstrate that the nulling technique can al...
متن کاملFASTLens (FAst STatistics for weak Lensing) : Fast method for Weak Lensing Statistics and map making
With increasingly large data sets, weak lensing measurements are able to measure cosmological parameters with ever greater precision. However this increased accuracy also places greater demands on the statistical tools used to extract the available information. To date, the majority of lensing analyses use the two point-statistics of the cosmic shear field. These can either be studied directly ...
متن کاملOptimal Weak Lensing Skewness Measurements
Weak lensing measurements are starting to provide statistical maps of the distribution of matter in the universe that are increasingly precise and complementary to cosmic microwave background maps. The most common measurement is the correlation in alignments of background galaxies which can be used to infer the variance of the projected surface density of matter. This measurement of the fluctua...
متن کاملThe effects of source clustering on weak lensing statistics
I investigate the effects of source clustering on the weak lensing statistics, more particularly on the statistical properties of the local convergence, κ, at large angular scales. The Perturbation Theory approach shows that the variance is not affected by source clustering at leading order but higher order moments such as the third and fourth moments can be. I compute the magnitude of these ef...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astroparticle Physics
سال: 2010
ISSN: 0927-6505
DOI: 10.1016/j.astropartphys.2009.10.003