Journal
ASTRONOMY & ASTROPHYSICS
Volume 436, Issue 1, Pages 37-46Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20041785
Keywords
cosmology : theory; galaxies : clusters : general; cosmic microwave background; gravitational lensing
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We adapt a non-linear filter proposed by Hu (2001) for detecting lensing of the CMB by large-scale structures to recover surface-density profiles of galaxy clusters from their localised, weak gravitational lensing effect on CMB fields. Shifting the band-pass of the filter to smaller scales, and normalising it such as to reproduce the convergence rather than the deflection angle, we find that the mean density profile of a sample of 100 clusters can be recovered to better than 10% from well within the scale radius to almost the virial radius. The kinetic Sunyaev-Zel'dovich effect is shown to be a negligible source of error. We test the filter applying it to data simulated using the characteristics of the Atacama Cosmology Telescope ( ACT), showing that it will be possible to recover mean cluster profiles outside a radius of 1' corresponding to ACT's angular resolution.
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