FASTLens: FAst STatistics for weak Lensing

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FASTLens (FAst STatistics for weak Lensing): Fast Method for Weak Lensing Statistics and Map Making

Post by owlice » Fri Oct 22, 2010 5:30 pm

[c]FASTLens (FAst STatistics for weak Lensing): Fast Method for Weak Lensing Statistics and Map Making[/c][/b]
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 point-statistics of the cosmic shear field. These can either be studied directly using the two-point correlation function, or in Fourier space, using the power spectrum. The two-point 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 fill-in 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.

Credit: Pires, S.; Starck, J.-L.; Amara, A.; Teyssier, R.; Refregier, A.; Fadili, J.


Bibcode: 2010ascl.soft10041P

ID: ascl:1010.041
Last edited by Ada Coda on Sat Apr 30, 2016 6:28 pm, edited 1 time in total.
Reason: Updated code entry.
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