2 code implementations • 20 Aug 2010 • B. Joachimi, R. Mandelbaum, F. B. Abdalla, S. L. Bridle
For r_p > 6 Mpc/h, the fits to galaxy position-shape correlation functions are consistent with the scaling with r_p and redshift of a revised, nonlinear version of the linear alignment model for all samples.
Cosmology and Nongalactic Astrophysics
no code implementations • 16 Jun 2016 • H. Hildebrandt, M. Viola, C. Heymans, S. Joudaki, K. Kuijken, C. Blake, T. Erben, B. Joachimi, D. Klaes, L. Miller, C. B. Morrison, R. Nakajima, G. Verdoes Kleijn, A. Amon, A. Choi, G. Covone, J. T. A. de Jong, A. Dvornik, I. Fenech Conti, A. Grado, J. Harnois-Déraps, R. Herbonnet, H. Hoekstra, F. Köhlinger, J. McFarland, A. Mead, J. Merten, N. Napolitano, J. A. Peacock, M. Radovich, P. Schneider, P. Simon, E. A. Valentijn, J. L. van den Busch, E. van Uitert, L. Van Waerbeke
We use shear measurements for nearly 15 million galaxies, determined with a new improved `self-calibrating' version of $lens$fit validated using an extensive suite of image simulations.
Cosmology and Nongalactic Astrophysics
1 code implementation • 21 Jun 2019 • S. Joudaki, H. Hildebrandt, D. Traykova, N. E. Chisari, C. Heymans, A. Kannawadi, K. Kuijken, A. H. Wright, M. Asgari, T. Erben, H. Hoekstra, B. Joachimi, L. Miller, T. Tröster, J. L. van den Busch
We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1).
Cosmology and Nongalactic Astrophysics
no code implementations • 16 Apr 2020 • M. Eriksen, A. Alarcon, L. Cabayol, J. Carretero, R. Casas, F. J. Castander, J. De Vicente, E. Fernandez, J. Garcia-Bellido, E. Gaztanaga, H. Hildebrandt, H. Hoekstra, B. Joachimi, R. Miquel, C. Padilla, E. Sanchez, I. Sevilla-Noarbe, P. Tallada
In this paper we introduce the \textsc{Deepz} deep learning photometric redshift (photo-$z$) code.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 14 Dec 2020 • B. Stölzner, B. Joachimi, A. Korn, H. Hildebrandt, A. H. Wright
We fit this model to pre-calibrated redshift distributions and implement an analytic marginalisation over the potentially several hundred redshift nuisance parameters in the weak lensing likelihood, which is demonstrated to accurately recover the cosmological posterior.
Cosmology and Nongalactic Astrophysics
no code implementations • 18 Feb 2021 • B. Joachimi, F. Köhlinger, W. Handley, P. Lemos
Summary statistics of the likelihood, such as the Bayesian evidence, offer a principled way of comparing models and assessing tension between, or within, the results of physical experiments.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics