Tomasz Kacprzak

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The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is the third in a series of image analysis challenges, with a goal of testing and facilitating the development of methods for analyzing astronomical images that will be used to measure weak gravitational lensing. This measurement requires extremely precise estimation of very small galaxy shape(More)
We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated spaceand ground-based(More)
GALSIM is a collaborative, open-source project aimed at providing an image simulation tool of enduring benefit to the astronomical community. It provides a software library for generating images of astronomical objects such as stars and galaxies in a variety of ways, efficiently handling image transformations and operations such as convolution and rendering(More)
In this paper, we present results from the weak-lensing shape measurement GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Galaxy Challenge. This marks an order of magnitude step change in the level of scrutiny employed in weak-lensing shape measurement analysis. We provide descriptions of each method tested and include 10 evaluation metrics over 24(More)
We present and describe IM3SHAPE, a new publicly available galaxy shape measurement code for weak gravitational lensing shear. IM3SHAPE performs a maximum likelihood fit of a bulgeplus-disc galaxy model to noisy images, incorporating an applied point spread function. We detail challenges faced and choices made in its design and implementation, and then(More)
Weak gravitational lensing has the potential to constrain cosmological parameters to high precision. However, as shown by the Shear Testing Programmes and Gravitational lensing Accuracy Testing challenges, measuring galaxy shears is a non-trivial task: various methods introduce different systematic biases which have to be accounted for. We investigate how(More)
M. R. Becker, 2, ∗ M. A. Troxel, N. MacCrann, E. Krause, T. F. Eifler, 5 O. Friedrich, 7 A. Nicola, A. Refregier, A. Amara, D. Bacon, G. M. Bernstein, C. Bonnett, S. L. Bridle, M. T. Busha, 2 C. Chang, S. Dodelson, 12 B. Erickson, A. E. Evrard, 13 J. Frieman, 12 E. Gaztanaga, D. Gruen, 7 W. Hartley, B. Jain, M. Jarvis, T. Kacprzak, D. Kirk, A. Kravtsov, B.(More)
This paper discusses factors influencing accuracy of estimating localization of radio networks terminals in indoor environment. It introduces parameters that can be useful to describe the quality of localization of radio landmarks. The paper presents a software for computer aided reference radio stations placement inside the buildings and shows the results(More)