Dark Energy Survey Year 1 Results: Wide field mass maps via forward fitting in harmonic space. (arXiv:1905.12682v1 [astro-ph.CO])

Dark Energy Survey Year 1 Results: Wide field mass maps via forward fitting in harmonic space. (arXiv:1905.12682v1 [astro-ph.CO])
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We present new wide-field weak lensing mass maps for the Year 1 Dark Energy
Survey data, generated via a forward fitting approach. This method of producing
maps does not impose any prior constraints on the mass distribution to be
reconstructed. The technique is found to improve the map reconstruction on the
edges of the field compared to the conventional Kaiser-Squires method, which
applies a direct inversion on the data; our approach is in good agreement with
the previous direct approach in the central regions of the footprint. The
mapping technique is assessed and verified with tests on simulations; together
with the Kaiser-Squires method, the technique is then applied to data from the
Dark Energy Survey Year 1 data and the differences between the two methods are
compared. We also produce the first DES measurements of the convergence
Minkowski functionals and compare them to those measured in simulations.

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