Deconvolution with shapelets
Deconvolution with shapelets
复制标题
使用 shapelet 进行反卷积
DOI:
10.1051/0004-6361:200810472
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发表时间:
2009
影响因子:
6.5
通讯作者:
Bartelmann
中科院分区:
文献类型:
--
作者:
Melchior;Andrae;Maturi;Bartelmann
AimsWe seek a shapelet-based scheme for deconvolving galaxy images from the PSF that leads to unbiased shear measurements.MethodsBased on the analytic formulation of convolution in shapelet space, we constructed a procedure to recover the unconvolved shapelet coefficients under the assumption that the PSF is perfectly known. Using specific simulations, we test this approach and compare it to other published approaches.ResultsWe show that convolution in shapelet space leads to a shapelet model of order , with and being the maximum orders of the intrinsic galaxy and the PSF models, respectively. Deconvolution is hence a transformation that maps a certain number of convolved coefficients onto a generally smaller number of deconvolved coefficients. By inferring the latter number from data, we construct the maximum-likelihood solution for this transformation and obtain unbiased shear estimates with a remarkable amount of noise reduction compared to established approaches. This finding is particularly valid for complicated PSF models and low images, which renders our approach suitable for typical weak-lensing conditions.
DOI:
10.1111/j.1365-2966.2006.11315.x
发表时间:
2006-08
影响因子:
4.8
作者:
R. Massey;C. Heymans;J. Bergé;G. Bernstein;S. Bridle;D. Clowe;H. Dahle;R. Ellis;T. Erben
通讯作者:
R. Massey;C. Heymans;J. Bergé;G. Bernstein;S. Bridle;D. Clowe;H. Dahle;R. Ellis;T. Erben
DOI:
10.1111/j.1365-2966.2006.10198.x
发表时间:
2006-05-21
影响因子:
4.8
作者:
Heymans, C;Van Waerbeke, L;Wittman, D
通讯作者:
Wittman, D
影响因子:
6.5
作者:
Melchior;Meneghetti;Bartelmann
通讯作者:
Bartelmann