Search Results for author: Shahab Joudaki

Found 5 papers, 4 papers with code

Organised Randoms: Learning and correcting for systematic galaxy clustering patterns in KiDS using self-organising maps

no code implementations15 Dec 2020 Harry Johnston, Angus H. Wright, Benjamin Joachimi, Maciej Bilicki, Nora Elisa Chisari, Andrej Dvornik, Thomas Erben, Benjamin Giblin, Catherine Heymans, Hendrik Hildebrandt, Henk Hoekstra, Shahab Joudaki, Mohammadjavad Vakili

We then create `organised' randoms, i. e. random galaxy catalogues with spatially variable number densities, mimicking the learnt systematic density modes in the data.

Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies

Core Cosmology Library: Precision Cosmological Predictions for LSST

3 code implementations14 Dec 2018 Nora Elisa Chisari, David Alonso, Elisabeth Krause, C. Danielle Leonard, Philip Bull, Jérémy Neveu, Antonio Villarreal, Sukhdeep Singh, Thomas McClintock, John Ellison, Zilong Du, Joe Zuntz, Alexander Mead, Shahab Joudaki, Christiane S. Lorenz, Tilman Troester, Javier Sanchez, Francois Lanusse, Mustapha Ishak, Renée Hlozek, Jonathan Blazek, Jean-Eric Campagne, Husni Almoubayyed, Tim Eifler, Matthew Kirby, David Kirkby, Stéphane Plaszczynski, Anze Slosar, Michal Vrastil, Erika L. Wagoner

As a result, predictions for correlation functions of galaxy clustering, galaxy-galaxy lensing and cosmic shear are demonstrated to be within a fraction of the expected statistical uncertainty of the observables for the models and in the range of scales of interest to LSST.

Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics

KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering

1 code implementation20 Jul 2017 Shahab Joudaki, Chris Blake, Andrew Johnson, Alexandra Amon, Marika Asgari, Ami Choi, Thomas Erben, Karl Glazebrook, Joachim Harnois-Deraps, Catherine Heymans, Hendrik Hildebrandt, Henk Hoekstra, Dominik Klaes, Konrad Kuijken, Chris Lidman, Alexander Mead, Lance Miller, David Parkinson, Gregory B. Poole, Peter Schneider, Massimo Viola, Christian Wolf

The complementarity of our observables allows for constraints on modified gravity degrees of freedom that are not simultaneously bounded with either probe alone, and up to a factor of three improvement in the $S_8$ constraint in the extended cosmology compared to KiDS alone.

Cosmology and Nongalactic Astrophysics

CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics

1 code implementation21 Jan 2016 Shahab Joudaki, Chris Blake, Catherine Heymans, Ami Choi, Joachim Harnois-Deraps, Hendrik Hildebrandt, Benjamin Joachimi, Andrew Johnson, Alexander Mead, David Parkinson, Massimo Viola, Ludovic van Waerbeke

When the systematic uncertainties are considered independently, the intrinsic alignment amplitude is the only degree of freedom that is substantially preferred by the data.

Cosmology and Nongalactic Astrophysics

An accurate halo model for fitting non-linear cosmological power spectra and baryonic feedback models

2 code implementations28 May 2015 Alexander Mead, John Peacock, Catherine Heymans, Shahab Joudaki, Alan Heavens

We are able to fit all feedback models investigated at the 5 per cent level using only two free parameters, and we place limits on the range of these halo parameters for feedback models investigated by the OWLS simulations.

Cosmology and Nongalactic Astrophysics

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