Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..371...59b&link_type=abstract
Statistical Challenges in Modern Astronomy IV ASP Conference Series, Vol. 371, proceedings of the conference held 12-15 June 200
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Weak gravitational lensing is the detection of subtle distortion (shear) of background images due to the gradients of the gravitational-lensing deflection by the mass of foreground objects. It is a signal that is very straightforward to predict once a model for the mass distribution of the Universe is available, and promises to offer determination of cosmological parameters to very high accuracy in the coming decade. When surveys of >10^9 background galaxies are completed, the statistical challenges that must be faced include: (1) measuring the lensing distortion to parts per thousand accuracy when the intrinsic shapes of galaxies are irregular, and are viewed through distorting optics/atmosphere, noise, and finite sampling; and (2) extracting the most information from the 3-dimensional shear field, given that the intervening mass distribution is a highly non-Gaussian field.
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