Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2104k&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #21.04; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a regularized maximum-likelihood method for reconstructing two dimensional mass maps using weak gravitational lensing data. To utilize all the shear information, we employ an iterative inverse method with a properly selected regularization coefficient which fits for the deflection potential at the position of each galaxy. The expectation value of the ellipticities of the sources is estimated as a function of the deflection potential via realistic simulations. By producing mass maps with multiple resolutions in the different parts of the observed field, we can achieve a uniform signal to noise level by increasing the resolution in regions of higher distortion or regions with an over-density of background galaxies. In addition, we are able to better study the sub-structure of massive clusters at a resolution which is not attainable in the rest of the observed field. We apply our technique to the simulated data and to a four square degree field obtained by the Deep Lens Survey (R < 26).
Dell'Antonio Ian
Khiabanian Hossein
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