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Galaxy shear estimation from stacked images · Around

2009

Galaxy shear estimation from stacked images

Lewis, Antony

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Statistics of the weak lensing of galaxies can be used to constrain cosmology if the galaxy shear can be estimated accurately.

In general this requires accurate modelling of unlensed galaxy shapes and the point spread function (PSF).
I discuss suboptimal but potentially robust methods for estimating galaxy shear by stacking images such that the stacked image distribution is closely Gaussian by the central limit theorem.
The shear can then be determined by radial fitting, requiring only an accurate model of the PSF rather than also needing to model each galaxy accurately.

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Bernstein G. M., Jarvis M., 2002, AJ, 123, 583, astro-ph/0107431
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Then

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Later among the works it cites.
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Kitching T. D., Miller L., Heymans C. E., van Waerbeke L., Heavens A. F., 2008, MNRAS, 390, 0802.1528
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Voigt L., Bridle S., 2009, Fundamental limits to lensing shear estimation for model fitting methods, in preparation
Original
2009
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