1 code implementation • 13 Jan 2021 • Maximilian von Wietersheim-Kramsta, Benjamin Joachimi, Jan Luca van den Busch, Catherine Heymans, Hendrik Hildebrandt, Marika Asgari, Tilman Tröster, Angus H. Wright
For BOSS-like lenses, we forecast a contribution of the magnification bias to the GGL signal between the multipole moments, $\ell$, of 100 and 4600 with a cumulative signal-to-noise ratio between 0. 1 and 1. 1 for sources from the Kilo-Degree Survey (KiDS), between 0. 4 and 2. 0 for sources from the Hyper Suprime-Cam survey (HSC), and between 0. 3 and 2. 8 for ESA Euclid-like source samples.
Cosmology and Nongalactic Astrophysics
no code implementations • 15 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
no code implementations • 4 Dec 2020 • Joachim Harnois-Déraps, Nicolas Martinet, Tiago Castro, Klaus Dolag, Benjamin Giblin, Catherine Heymans, Hendrik Hildebrandt, Qianli Xia
With mock DES-Y1 data we calibrate the impact of photometric redshift and shear calibration uncertainty on the peak-count, marginalising over these uncertainties in our cosmological analysis.
Cosmology and Nongalactic Astrophysics
3 code implementations • 3 Sep 2020 • Alexander Mead, Samuel Brieden, Tilman Tröster, Catherine Heymans
We present an updated version of the HMcode augmented halo model that can be used to make accurate predictions of the non-linear matter power spectrum over a wide range of cosmologies.
Cosmology and Nongalactic Astrophysics
2 code implementations • 3 Jul 2020 • Benjamin Giblin, Catherine Heymans, Marika Asgari, Hendrik Hildebrandt, Henk Hoekstra, Benjamin Joachimi, Arun Kannawadi, Konrad Kuijken, Chieh-An Lin, Lance Miller, Tilman Tröster, Jan Luca van den Busch, Angus H. Wright, Maciej Bilicki, Chris Blake, Jelte de Jong, Andrej Dvornik, Thomas Erben, Fedor Getman, Nicola R. Napolitano, Peter Schneider, HuanYuan Shan
We present weak lensing shear catalogues from the fourth data release of the Kilo-Degree Survey, KiDS-1000, spanning 1006 square degrees of deep and high-resolution imaging.
Cosmology and Nongalactic Astrophysics
no code implementations • 8 May 2020 • Angus H. Wright, Hendrik Hildebrandt, Jan Luca van den Busch, Catherine Heymans, Benjamin Joachimi, Arun Kannawadi, Konrad Kuijken
We present updated cosmological constraints for the KiDS+VIKING-450 cosmic shear dataset (KV450), estimated using redshift distributions and photometric samples defined using self organising maps (SOMs).
Cosmology and Nongalactic Astrophysics
no code implementations • 20 Sep 2019 • Angus H. Wright, Hendrik Hildebrandt, Jan Luca van den Busch, Catherine Heymans
We demonstrate that the previous direct redshift calibration method applied to the full cosmic shear sample is accurate to $| \Delta \langle z \rangle | < 0. 025$.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
1 code implementation • 20 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
1 code implementation • 5 Feb 2016 • Alexander Mead, Catherine Heymans, Lucas Lombriser, John Peacock, Olivia Steele, Hans Winther
We show that the tuned halo model method can predict the non-linear matter power spectrum measured from simulations of parameterised $w(a)$ dark energy models at the few per cent level for $k<10\, h\mathrm{Mpc}^{-1}$, and we present theoretically motivated extensions to cover non-minimally coupled scalar fields, massive neutrinos and Vainshtein screened modified gravity models that result in few per cent accurate power spectra for $k<10\, h\mathrm{Mpc}^{-1}$.
Cosmology and Nongalactic Astrophysics
1 code implementation • 21 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
2 code implementations • 28 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
1 code implementation • 11 Sep 2014 • Jes Ford, Ludovic van Waerbeke, Martha Milkeraitis, Clotilde Laigle, Hendrik Hildebrandt, Thomas Erben, Catherine Heymans, Henk Hoekstra, Thomas Kitching, Yannick Mellier, Lance Miller, Ami Choi, Jean Coupon, Liping Fu, Michael J. Hudson, Konrad Kuijken, Naomi Robertson, Barnaby Rowe, Tim Schrabback, Malin Velander
We present the cluster mass-richness scaling relation calibrated by a weak lensing analysis of >18000 galaxy cluster candidates in the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS).
Cosmology and Nongalactic Astrophysics
no code implementations • 6 Feb 2007 • Jason D. Rhodes, Richard Massey, Justin Albert, Nicholas Collins, Richard S. Ellis, Catherine Heymans, Jonathan P. Gardner, Jean-Paul Kneib, Anton Koekemoer, Alexie Leauthaud, Yannick Mellier, Alexandre Refregier, James E. Taylor, Ludovic van Waerbeke
We derive a parametric correction for the effect of CTE on the shapes of objects in the COSMOS field as a function of observation date, position within the ACS WFC field, and object flux.
