FASTLens (FAst STatistics for weak Lensing): Fast Method for Weak Lensing Statistics and Map Making
Abstract
The analysis of weak lensing data requires to account for missing data such as masking out of bright stars. To date, the majority of lensing analyses uses the two pointstatistics of the cosmic shear field. These can either be studied directly using the twopoint correlation function, or in Fourier space, using the power spectrum. The twopoint correlation function is unbiased by missing data but its direct calculation will soon become a burden with the exponential growth of astronomical data sets. The power spectrum is fast to estimate but a mask correction should be estimated. Other statistics can be used but these are strongly sensitive to missing data. The solution that is proposed by FASTLens is to properly fillin the gaps with only NlogN operations, leading to a complete weak lensing mass map from which one can compute straight forwardly and with a very good accuracy any kind of statistics like power spectrum or bispectrum.
 Publication:
 Astrophysics Source Code Library
 Pub Date:
 October 2010
 Bibcode:
 2010ascl.soft10041P
 Keywords:

 Software