Search Results for author: Henk Hoekstra

Found 7 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

Accounting for object detection bias in weak gravitational lensing studies

no code implementations8 Oct 2020 Henk Hoekstra, Arun Kannawadi, Thomas D. Kitching

We find that MetaDetection is able to account for blending, leading to average multiplicative biases that meet requirements for Stage IV surveys, provided a sufficiently accurate model for the point spread function is available.

Object Detection Cosmology and Nongalactic Astrophysics

The halo model as a versatile tool to predict intrinsic alignments

no code implementations5 Mar 2020 Maria Cristina Fortuna, Henk Hoekstra, Benjamin Joachimi, Harry Johnston, Nora Elisa Chisari, Christos Georgiou, Constance Mahony

In this paper, we use the halo model formalism to capture this diversity and examine its implications for Stage-III and Stage-IV cosmic shear surveys.

Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies

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

The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses

1 code implementation6 Feb 2015 Henk Hoekstra, Ricardo Herbonnet, Adam Muzzin, Arif Babul, Andisheh Mahdavi, Massimo Viola, Marcello Cacciato

Nonetheless we find that the uncertainty in the determination of photometric redshifts is the largest source of systematic error for our mass estimates.

Cosmology and Nongalactic Astrophysics

CFHTLenS: A Weak Lensing Shear Analysis of the 3D-Matched-Filter Galaxy Clusters

1 code implementation11 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

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