Publications (73)
Point spread function modelling for astronomical telescopes: a review focused on weak gravitational lensing studies
Tobias Liaudat, Jean-Luc Starck, Martin Kilbinger
The accurate modelling of the Point Spread Function (PSF) is of paramount importance in astronomical observations, as it allows for the correction of distortions and blurring cause…
The DESI Experiment Part I: Science,Targeting, and Survey Design
DESI Collaboration, Amir Aghamousa, Jessica Aguilar +290
DESI (Dark Energy Spectroscopic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure through…
Clustering, host halos and environment of z2 galaxies as a function of their physical properties
Matthieu Bethermin, Martin Kilbinger, Emanuele Daddi +13
Using a sample of 25683 star-forming and 2821 passive galaxies at , selected in the COSMOS field following the BzK color criterion, we study the hosting halo mass and envir…
Measuring satellite galaxy subhalo masses in redMaPPer clusters with UNIONS weak lensing data
Roman Akhmetshyn, Jack Elvin-Poole, Michael J. Hudson +13
The paper measures the weak gravitational lensing signal of satellite galaxies in rich clusters using UNIONS data to estimate their subhalo masses and study tidal stripping effects…
CFHTLenS: Mapping the Large Scale Structure with Gravitational Lensing
Ludovic Van Waerbeke, Jonathan Benjamin, Thomas Erben +18
We present a quantitative analysis of the largest contiguous maps of projected mass density obtained from gravitational lensing shear. We use data from the 154 deg2 covered by the…
The XXL Survey IV. Mass-temperature relation of the bright cluster sample
Maggie Lieu, Graham P. Smith, Paul A. Giles +18
The XXL survey is the largest survey carried out by XMM-Newton. Covering an area of 50deg, the survey contains galaxy clusters out to a redshift 2 and to an X-r…
A new cosmic shear function: Optimised E-/B-mode decomposition on a finite interval
Liping Fu, Martin Kilbinger
The decomposition of the cosmic shear field into E- and B-mode is an important diagnostic in weak gravitational lensing. However, commonly used techniques to perform this separatio…
Analysis of two-point statistics of cosmic shear: II. Optimizing the survey geometry
Martin Kilbinger, Peter Schneider
We present simulations of a cosmic shear survey and show how the survey geometry influences the accuracy of determination of cosmological parameters. We numerically calculate the f…
Sidestepping the inversion of the weak-lensing covariance matrix with Approximate Bayesian Computation
Martin Kilbinger, Emille E. O. Ishida, Jessi Cisewski-Kehe
Weak gravitational lensing is one of the few direct methods to map the dark-matter distribution on large scales in the Universe, and to estimate cosmological parameters. We study a…
Rethinking data-driven point spread function modeling with a differentiable optical model
Tobias Liaudat, Jean-Luc Starck, Martin Kilbinger +1
In astronomy, upcoming space telescopes with wide-field optical instruments have a spatially varying point spread function (PSF). Specific scientific goals require a high-fidelity…
CFHTLenS tomographic weak lensing: Quantifying accurate redshift distributions
Jonathan Benjamin, Ludovic Van Waerbeke, Catherine Heymans +18
The Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) comprises deep multi-colour (u*g'r'i'z') photometry spanning 154 square degrees, with accurate photometric redshifts an…
Principal Component Analysis of Weak Lensing Surveys
Dipak Munshi, Martin Kilbinger
We study degeneracies between cosmological parameters and measurement errors from cosmic shear surveys using a principal component analysis of the Fisher matrix. We simulate realis…
CFHTLenS: The Canada-France-Hawaii Telescope Lensing Survey
Catherine Heymans, Ludovic Van Waerbeke, Lance Miller +19
We present the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) that accurately determines a weak gravitational lensing signal from the full 154 square degrees of deep mult…
Estimation of cosmological parameters using adaptive importance sampling
Darren Wraith, Martin Kilbinger, Karim Benabed +5
We present a Bayesian sampling algorithm called adaptive importance sampling or Population Monte Carlo (PMC), whose computational workload is easily parallelizable and thus has the…
Cosmology from UNIONS weak lensing profiles of galaxy clusters
Charlie T. Mpetha, James E. Taylor, Yuba Amoura +12
Cosmological information is encoded in the structure of galaxy clusters. In Universes with less matter and larger initial density perturbations, clusters form earlier and have more…
The shape of dark matter haloes: results from weak lensing in the Ultraviolet Near-Infrared Optical Northern Survey (UNIONS)
Bailey Robison, Michael J. Hudson, Jean-Charles Cuillandre +11
Cold dark matter haloes are expected to be triaxial, and so appear elliptical in projection. We use weak gravitational lensing from the Canada-France Imaging Survey (CFIS) componen…
Cosmological parameters from weak cosmological lensing
Martin Kilbinger
In this manuscript of the habilitation à diriger des recherches (HDR), the author presents some of his work over the last ten years. The main topic of this thesis is cosmic shear,…
CFHTLenS: Testing the Laws of Gravity with Tomographic Weak Lensing and Redshift Space Distortions
Fergus Simpson, Catherine Heymans, David Parkinson +20
Dark energy may be the first sign of new fundamental physics in the Universe, taking either a physical form or revealing a correction to Einsteinian gravity. Weak gravitational len…
CFHTLenS: Weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment
Tim Schrabback, Stefan Hilbert, Henk Hoekstra +16
We present weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment. Using data from the Canada-France-Hawaii Telescope Lensing Su…
Kinematic lensing with high-resolution spectroscopic surveys. A unique opportunity for transformative cosmology at high redshifts in the 2040s
Stefano Camera, Martin Kilbinger, Jean-Paul Kneib +10
We present a science case to perform high-redshift cosmic shear surveys for cosmology with next-generation spectroscopic instruments, such as the proposed MegaMapper and Wide-field…
On the Validity of Cosmological Fisher Matrix Forecasts
Laura Wolz, Martin Kilbinger, Jochen Weller +1
We present a comparison of Fisher matrix forecasts for cosmological probes with Monte Carlo Markov Chain (MCMC) posterior likelihood estimation methods. We analyse the performance…
CosmoPMC: Cosmology Population Monte Carlo
Martin Kilbinger, Karim Benabed, Olivier Cappe +7
We present the public release of the Bayesian sampling algorithm for cosmology, CosmoPMC (Cosmology Population Monte Carlo). CosmoPMC explores the parameter space of various cosmol…
Precision calculations of the cosmic shear power spectrum projection
Martin Kilbinger, Catherine Heymans, Marika Asgari +9
We compute the spherical-sky weak-lensing power spectrum of the shear and convergence. We discuss various approximations, such as flat-sky, and first- and second- order Limber equa…
Improved Primordial Non-Gaussianity Constraints from Measurements of Galaxy Clustering and the Integrated Sachs-Wolfe Effect
Tommaso Giannantonio, Ashley J. Ross, Will J. Percival +5
We present the strongest robust constraints on primordial non-Gaussianity (PNG) from currently available galaxy surveys, combining large-scale clustering measurements and their cro…
CFHTLS weak-lensing constraints on the neutrino masses
Ismael Tereno, Carlo Schimd, Jean-Philippe Uzan +3
We use measurements of cosmic shear from CFHTLS, combined with WMAP-5 cosmic microwave background anisotropy data, baryonic acoustic oscillations from SDSS and 2dFGRS and supernova…
Measurement of the halo bias from stacked shear profiles of galaxy clusters
Giovanni Covone, Mauro Sereno, Martin Kilbinger +1
We present the observational evidence of the 2-halo term in the stacked shear profile of a sample of about 1200 optically selected galaxy clusters based on imaging data and the pub…
Shear measurement bias I: dependencies on methods, simulation parameters and measured parameters
Arnau Pujol, Florent Sureau, Jerome Bobin +3
We present a study of the dependencies of shear bias on simulation (input) and measured (output) parameters, noise, point-spread function anisotropy, pixel size, and the model bias…
UNIONS: The impact of systematic errors on weak-lensing peak counts
Emma Ayçoberry, Virginia Ajani, Axel Guinot +6
UNIONS is an ongoing deep photometric multi-band survey of the Northern sky. As part of UNIONS, CFIS provides r-band data which we use to study weak-lensing peak counts for cosmolo…
UNIONS: a direct measurement of intrinsic alignment with BOSS/eBOSS spectroscopy
Fabian Hervas Peters, Martin Kilbinger, Romain Paviot +12
During their formation, galaxies are subject to tidal forces, which create correlations between their shapes and the large-scale structure of the Universe, known as intrinsic align…
The ring statistics - how to separate E- and B-modes of cosmic shear correlation functions on a finite interval
Peter Schneider, Martin Kilbinger
Aims. One of the main probes for systematic errors in the cosmic shear signal are the division of the shear field into E- and B-mode shear, where gravitational lensing only produce…
A highly precise shear bias estimator independent of the measured shape noise
Arnau Pujol, Martin Kilbinger, Florent Sureau +1
We present a new method to estimate shear measurement bias in image simulations that significantly improves the precision with respect to current techniques. Our method is based on…
Galaxy-Point Spread Function correlations as a probe of weak-lensing systematics with UNIONS data
Sacha Guerrini, Martin Kilbinger, Hubert Leterme +6
Weak gravitational lensing requires precise measurements of galaxy shapes and therefore an accurate knowledge of the PSF model. The latter can be a source of systematics that affec…
Analysis of two-point statistics of cosmic shear: I. Estimators and covariances
Peter Schneider, Ludovic van Waerbeke, Martin Kilbinger +1
We derive in this paper expressions for the covariance matrix of the cosmic shear two-point correlation functions which are readily applied to any survey geometry. Furthermore, we…
Revisiting the 'Lensing is Low' Problem with UNIONS
Martine C. T. Campbell, Jack Elvin-Poole, Michael J. Hudson +11
We present new measurements of the galaxy-galaxy lensing (GGL) signal around Baryon Oscillation Spectroscopic Survey (BOSS) CMASS galaxies using background sources from the Ultravi…
Ram Pressure Candidates in UNIONS
Ian D. Roberts, Laura C. Parker, Stephen Gwyn +17
We present a search for disturbed, candidate ram pressure stripping galaxies across more than 50 spectroscopically selected SDSS groups and clusters. Forty-eight ram pressure candi…
On the impact of intergalactic dust on cosmology with type Ia supernovae
Brice Ménard, Martin Kilbinger, Ryan Scranton
Supernova measurements have become a key ingredient in current determinations of cosmological parameters. These sources can however be used as standard candles only after correctin…
Photometric redshifts: estimating their contamination and distribution using clustering information
Jonathan Benjamin, Ludovic Van Waerbeke, Brice Ménard +1
We present a new technique to estimate the level of contamination between photometric redshift bins. If the true angular cross-correlation between redshift bins can be safely assum…
CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments
Catherine Heymans, Emma Grocutt, Alan Heavens +21
We present a finely-binned tomographic weak lensing analysis of the Canada-France-Hawaii Telescope Lensing Survey, CFHTLenS, mitigating contamination to the signal from the presenc…
A new model to predict weak-lensing peak counts III. Filtering technique comparisons
Chieh-An Lin, Martin Kilbinger, Sandrine Pires
This is the third in a series of papers that develop a new and flexible model to predict weak-lensing (WL) peak counts, which have been shown to be a very valuable non-Gaussian pro…
Cluster properties as a function of dynamical state in the DESI Legacy x UNIONS surveys
Syeda Lammim Ahad, Rashaad Reid, Charlie T. Mpetha +10
We investigate how the dynamical state of galaxy clusters influences their galaxy populations and mass distributions. Using photometrically selected clusters from the DESI Legacy I…
Weak lensing Analysis of X-Ray-selected XXL Galaxy Groups and Clusters with Subaru HSC Data
Keiichi Umetsu, Mauro Sereno, Maggie Lieu +23
We present a weak-lensing analysis of X-ray galaxy groups and clusters selected from the XMM-XXL survey using the first-year data from the Hyper Suprime-Cam (HSC) Subaru Strategic…
Evidence for the accelerated expansion of the Universe from weak lensing tomography with COSMOS
Tim Schrabback, Jan Hartlap, Benjamin Joachimi +19
We present a tomographic cosmological weak lensing analysis of the HST COSMOS Survey. Applying our lensing-optimized data reduction, principal component interpolation for the ACS P…
The DESI Experiment Part II: Instrument Design
DESI Collaboration, Amir Aghamousa, Jessica Aguilar +290
DESI (Dark Energy Spectropic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations and the growth of structure through redshift…
Quantifying systematics from the shear inversion on weak-lensing peak counts
Chieh-An Lin, Martin Kilbinger
Weak-lensing peak counts provide a straightforward way to constrain cosmology by linking local maxima of the lensing signal to the mass function. Recent applications to data have a…
Bayesian model comparison in cosmology with Population Monte Carlo
Martin Kilbinger, Darren Wraith, Christian P. Robert +6
We use Bayesian model selection techniques to test extensions of the standard flat LambdaCDM paradigm. Dark-energy and curvature scenarios, and primordial perturbation models are c…
Cosmological Parameters from Cosmic Shear
Martin Kilbinger
We present simulations of a cosmic shear survey and show how the survey geometry influences the accuracy of determination of cosmological parameters. We numerically calculate the f…
UNIONS Optical Identifications for VLASS Radio Sources in the Euclid Sky (UNVEIL) I. A Catalog of ~146,000 Radio Galaxies up to z~5
Yuxing Zhong, Kohei Ichikawa, Hendrik Hildebrandt +11
We present results of optical identifications for Very Large Array Sky Survey (VLASS) radio sources using the Ultraviolet Near Infrared Optical Northern Survey (UNIONS). A cross-ma…
A new model to predict weak-lensing peak counts II. Parameter constraint strategies
Chieh-An Lin, Martin Kilbinger
Peak counts have been shown to be an excellent tool to extract the non-Gaussian part of the weak lensing signal. Recently, we developped a fast stochastic forward model to predict…
Tomography and Weak lensing Statistics
Dipak Munshi, Peter Coles, Martin Kilbinger
Extending previous studies, we derive generic predictions for lower order cumulants and their correlators for individual tomographic bins as well as between two different bins. We…
Designing Weak Lensing Surveys: A Generalised Eigenmode Analysis
Martin Kilbinger, Dipak Munshi
We study the estimators of various second-order weak lensing statistics such as the shear correlation functions xi_\pm and the aperture mass dispersion <M_ap^2> which can directly…
ShapePipe: a new shape measurement pipeline and weak-lensing application to UNIONS/CFIS data
Axel Guinot, Martin Kilbinger, Samuel Farrens +16
UNIONS is an ongoing collaboration that will provide the largest deep photometric survey of the Northern sky in four optical bands to date. As part of this collaboration, CFIS is t…
Cosmology with cosmic shear observations: a review
Martin Kilbinger
Cosmic shear is the distortion of images of distant galaxies due to weak gravitational lensing by the large-scale structure in the Universe. Such images are coherently deformed by…
UNIONS: The Ultraviolet Near-Infrared Optical Northern Survey
Stephen Gwyn, Alan W. McConnachie, Jean-Charles Cuillandre +86
The Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) is a "collaboration of collaborations" that is using the Canada-France-Hawai'i Telescope, the Pan-STARRS telescopes,…
Constraining constant and tomographic coupled dark energy with low-redshift and high-redshift probes
Lisa W. K. Goh, Adrià Gómez-Valent, Valeria Pettorino +1
We consider coupled dark energy (CDE) cosmologies, where dark matter particles feel a force stronger than gravity, due to the fifth force mediated by a scalar field which plays the…
Assessing the large-scale angular clustering of UNIONS Lyman Break Galaxies via cross-correlations
Constantin Payerne, Christophe Yèche, William d'Assignies Doumerg +7
The paper evaluates the use of UNIONS-selected Lyman-break galaxies as tracers of large‑scale structure at high redshift, finding that cross‑correlations with CMB lensing and quasa…
Rethinking the modeling of the instrumental response of telescopes with a differentiable optical model
Tobias Liaudat, Jean-Luc Starck, Martin Kilbinger +1
We propose a paradigm shift in the data-driven modeling of the instrumental response field of telescopes. By adding a differentiable optical forward model into the modeling framewo…
CFHTLenS: Combined probe cosmological model comparison using 2D weak gravitational lensing
Martin Kilbinger, Liping Fu, Catherine Heymans +20
We present cosmological constraints from 2D weak gravitational lensing by the large-scale structure in the Canada-France Hawaii Telescope Lensing Survey (CFHTLenS) which spans 154…
A new model to predict weak-lensing peak counts I. Comparison with -body Simulations
Chieh-An Lin, Martin Kilbinger
Weak-lensing peak counts has been shown to be a powerful tool for cosmology. It provides non-Gaussian information of large scale structures, complementary to second order statistic…
Impact of weak-lensing mass-mapping algorithms on cosmology inference
Andreas Tersenov, Lucie Baumont, Jean-Luc Starck +1
Weak-lensing mass-mapping algorithms, which reconstruct the convergence field from galaxy shear measurements, are crucial for extracting higher-order statistics to constrain cosmol…
Point-Spread Function errors for weak lensing - density cross-correlations. Application to UNIONS
Ziwen Zhang, Martin Kilbinger, Fabian Hervas Peters +8
Aims:Calibrating the point spread function (PSF) is a fundamental part of weak gravitational lensing analyses. Even with corrected galaxy images, imperfect calibrations can introdu…
Unions with UNIONS: Using galaxy-galaxy lensing to probe galaxy mergers
Isaac Cheng, Jack Elvin-Poole, Michael J. Hudson +12
We use galaxy-galaxy lensing to investigate how the dark matter (DM) haloes and stellar content of galaxies with and $10 \leq \log_{10}(M_\star/\mathrm{M}_…
CFHTLenS: Cosmological constraints from a combination of cosmic shear two-point and three-point correlations
Liping Fu, Martin Kilbinger, Thomas Erben +17
Higher-order, non-Gaussian aspects of the large-scale structure carry valuable information on structure formation and cosmology, which is complementary to second-order statistics.…
CFHT MegaCam Two Deep Fields Imaging Survey (2DFIS) II: Decoding the Lensing Profile of a "Rotating" Cluster with Deep CFHT Imaging
Yicheng Li, Liping Fu, Wentao Luo +15
We present a multi-wavelength analysis of the galaxy cluster RXCJ0110.0+1358 (), a rotating cluster candidate, combining deep CFHT imaging, SDSS photometry, spectroscopic…
Shear measurement bias II: a fast machine learning calibration method
Arnau Pujol, Jerome Bobin, Florent Sureau +2
We present a new shear calibration method based on machine learning. The method estimates the individual shear responses of the objects from the combination of several measured pro…
E- and B-mode mixing from incomplete knowledge of the shear correlation
Martin Kilbinger, Peter Schneider, Tim Eifler
Aims. We quantify the mixing of the measured cosmic-shear E- and B-modes caused by the lack of shear-correlation measurements on small and large scales, arising from a lack of clos…
Black-Hole-to-Halo Mass Relation From UNIONS Weak Lensing
Qinxun Li, Martin Kilbinger, Wentao Luo +17
This letter presents, for the first time, direct constraints on the black-hole-to-halo-mass relation using weak gravitational lensing measurements. We construct type I and type II…
Lensing the darkness: The matter density profile in cosmic voids from UNIONS
Hunter L. Martin, Michael J. Hudson, Alex Woodfinden +14
We measure the distribution of matter contained within the emptiest regions of the Universe: cosmic voids. We use the large overlap between the Ultraviolet Near-Infrared Optical No…
CFHT MegaCam Two Deep Fields Imaging Survey (2DFIS) I: Overview
Binyang Liu, Wentao Luo, Martin Kilbinger +14
We present the Two Deep Fields Imaging Survey (2DFIS), a wide-field imaging program conducted with the Canada-France-Hawaii Telescope (CFHT) targeting two astrophysically distinct…
GREAT3 results I: systematic errors in shear estimation and the impact of real galaxy morphology
Rachel Mandelbaum, Barnaby Rowe, Robert Armstrong +40
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 gravi…
Cosmological constraints with weak lensing peak counts and second-order statistics in a large-field survey
Austin Peel, Chieh-An Lin, Francois Lanusse +3
Peak statistics in weak lensing maps access the non-Gaussian information contained in the large-scale distribution of matter in the Universe. They are therefore a promising complem…
Fitting formulae of the reduced-shear power spectrum for weak lensing
Martin Kilbinger
Context. Weak gravitational lensing is a powerful probe of large-scale structure and cosmology. Most commonly, second-order correlations of observed galaxy ellipticities are expres…
The three-point correlation function of cosmic shear. II: Relation to the bispectrum of the projected mass density and generalized third-order aperture measures
Peter Schneider, Martin Kilbinger, Marco Lombardi
We study the relation of the three-point cosmic shear statistics to the third-order statistical properties of the underlying convergence, expressed in terms of its bispectrum. Expl…
Cosmological parameters from combined second- and third-order aperture mass statistics of cosmic shear
Martin Kilbinger, Peter Schneider
We present predictions for cosmological parameter constraints from combined measurements of second- and third-order statistics of cosmic shear. We define the generalized third-orde…