Publications (73)
Halo shapes constrained from a pure sample of central galaxies in KiDS-1000
Christos Georgiou, Henk Hoekstra, Konrad Kuijken +12
We present measurements of , the ratio of the aligned components of the projected halo and galaxy ellipticities, for a sample of central galaxies using weak gravitational lens…
CFHTLenS: The Environmental Dependence of Galaxy Halo Masses from Weak Lensing
Bryan R. Gillis, Michael J. Hudson, Thomas Erben +16
We use weak gravitational lensing to analyse the dark matter halos around satellite galaxies in galaxy groups in the CFHTLenS dataset. This dataset is derived from the CFHTLS-Wide…
Precise weak lensing constraints from deep high-resolution images: VLT/HAWK-I analysis of the super-massive galaxy cluster RCS2232727.7020437 at
Tim Schrabback, Mischa Schirmer, Remco F. J. van der Burg +16
We demonstrate that deep good-seeing VLT/HAWK-I images complemented with +-band photometry can yield a sensitivity for weak lensing studies of massive galaxy c…
New constraints on the evolution of the stellar-to-dark matter connection: a combined analysis of galaxy-galaxy lensing, clustering, and stellar mass functions from z=0.2 to z=1
Alexie Leauthaud, Jeremy Tinker, Kevin Bundy +20
Using data from the COSMOS survey, we perform the first joint analysis of galaxy-galaxy weak lensing, galaxy spatial clustering, and galaxy number densities. Carefully accounting f…
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…
Rubin-Euclid Derived Data Products: Initial Recommendations
Leanne P. Guy, Jean-Charles Cuillandre, Etienne Bachelet +117
This report is the result of a joint discussion between the Rubin and Euclid scientific communities. The work presented in this report was focused on designing and recommending an…
On the shear estimation bias induced by the spatial variation of colour across galaxy profiles
Elisabetta Semboloni, Henk Hoekstra, Zhuoyi Huang +13
The spatial variation of the colour of a galaxy may introduce a bias in the measurement of its shape if the PSF profile depends on wavelength. We study how this bias depends on the…
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…
X-ray Properties of SPT Selected Galaxy Clusters at 0.2<z<1.5 Observed with XMM-Newton
Esra Bulbul, I-Non Chiu, Joseph J. Mohr +22
We present measurements of the X-ray observables of the intra-cluster medium (ICM), including luminosity , ICM mass , emission-weighted mean temperature , and in…
The eROSITA Final Equatorial-Depth Survey (eFEDS): X-ray Observable-to-Mass-and-Redshift Relations of Galaxy Clusters and Groups with Weak-Lensing Mass Calibration from the Hyper Suprime-Cam Subaru Strategic Program Survey
I-Non Chiu, Vittorio Ghirardini, Ang Liu +18
We present the first weak-lensing mass calibration and X-ray scaling relations of galaxy clusters and groups selected in the Final Equatorial Depth Survey (eFEDS) observe…
Probing Galaxy Dark Matter Haloes in COSMOS with Weak Lensing Flexion
Malin Velander, Konrad Kuijken, Tim Schrabback
Current theories of structure formation predict specific density profiles of galaxy dark matter haloes, and with weak gravitational lensing we can probe these profiles on several s…
Results of the GREAT08 Challenge: An image analysis competition for cosmological lensing
Sarah Bridle, Sreekumar T. Balan, Matthias Bethge +31
We present the results of the GREAT08 Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. The primary goal was to stimulate new…
Mass and Light of Abell 370: A Strong and Weak Lensing Analysis
Victoria Strait, Marusa Bradac, Austin Hoag +13
We present a new gravitational lens model of the Hubble Frontier Fields cluster Abell 370 () using imaging and spectroscopy from Hubble Space Telescope and ground-based…
The mass distribution in an assembling super galaxy group at
Merijn Smit, Tim Schrabback, Malin Velander +4
We present a weak gravitational lensing analysis of supergroup SG11201202, consisting of four distinct X-ray-luminous groups, that will merge to form a cluster comparable in mas…
Probabilistic Mass Mapping with Neural Score Estimation
Benjamin Remy, Francois Lanusse, Niall Jeffrey +4
Weak lensing mass-mapping is a useful tool to access the full distribution of dark matter on the sky, but because of intrinsic galaxy ellipticies and finite fields/missing data, th…
Weak lensing mass bias and the alignment of center proxies
Martin W. Sommer, Tim Schrabback, Antonio Ragagnin +1
Galaxy cluster masses derived from observations of weak lensing suffer from a number of biases affecting the accuracy of mass-observable relations calibrated from such observations…
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…
The Grism Lens-Amplified Survey from Space (GLASS). VI. Comparing the Mass and Light in MACSJ0416.1-2403 using Frontier Field imaging and GLASS spectroscopy
Austin Hoag, Kuang-Han Huang, Tommaso Treu +12
We present a strong and weak gravitational lens model of the galaxy cluster MACSJ0416.1-2403, constrained using spectroscopy from the Grism Lens-Amplified Survey from Space (GLASS)…
Quantifying the impact of detection bias from blended galaxies on cosmic shear surveys
Eray Genc, Peter Schneider, Sandra Unruh +1
Increasingly large areas in cosmic shear surveys lead to a reduction of statistical errors, necessitating to control systematic errors increasingly better. One of these systematic…
Cosmic Evolution of Virial and Stellar Mass in Massive Early-Type Galaxies
David J. Lagattuta, Christopher D. Fassnacht, Matthew W. Auger +7
We measure the average mass properties of a sample of 41 strong gravitational lenses at moderate redshift (z ~ 0.4 - 0.9), and present the lens redshift for 6 of these galaxies for…
Strong Lensing Model of SPT-CLJ0356-5337, a Major Merger Candidate at Redshift 1.0359
Guillaume Mahler, Keren Sharon, Michael D. Gladders +10
We present an analysis of the mass distribution inferred from strong lensing by SPT-CL J0356-5337, a cluster of galaxies at redshift z = 1.0359 revealed in the follow-up of the SPT…
CFHTLenS: The relation between galaxy dark matter haloes and baryons from weak gravitational lensing
Malin Velander, Edo van Uitert, Henk Hoekstra +16
We present a study of the relation between dark matter halo mass and the baryonic content of host galaxies, quantified via luminosity and stellar mass. Our investigation uses 154 d…
Scientific Synergy Between LSST and Euclid
Jason Rhodes, Robert C. Nichol, Ãric Aubourg +34
Euclid and the Large Synoptic Survey Telescope (LSST) are poised to dramatically change the astronomy landscape early in the next decade. The combination of high cadence, deep, wid…
RCS2 J232727.6-020437: An Efficient Cosmic Telescope at
Austin Hoag, MaruÅ¡a BradaÄ, Kuang-Han Huang +13
We present a detailed gravitational lens model of the galaxy cluster RCS2 J232727.6-020437. Due to cosmological dimming of cluster members and ICL, its high redshift () m…
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…
The Chandra view of the Largest Quasar Lens SDSS J1029+2623
Naomi Ota, Masamune Oguri, Xinyu Dai +6
We present results from Chandra observations of the cluster lens SDSS J1029+2623 at z_l=0.58, which is a gravitationally lensed quasar with the largest known image separation. We c…
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…
Star Formation under a Cosmic Microscope: Highly magnified z = 11 galaxy behind the Bullet Cluster
MaruÅ¡a BradaÄ, Jon Judež, Chris Willott +20
We present measurements of stellar population properties of a newly discovered spectroscopically confirmed , gravitationally lensed galaxy, using JWST NIRS…
Optical follow-up study of 32 high-redshift galaxy cluster candidates from Planck with the William Herschel Telescope
Hannah Zohren, Tim Schrabback, Remco F. J. van der Burg +5
The Planck satellite has detected cluster candidates via the Sunyaev Zel'dovich (SZ) effect, but the optical follow-up required to confirm these candidates is still incomplete, esp…
Spitzer UltRa Faint SUrvey Program (SURFS UP). II. IRAC-Detected Lyman-Break Galaxies at 6 < z < 10 Behind Strong-Lensing Clusters
Kuang-Han Huang, MaruÅ¡a BradaÄ, Brian C. Lemaux +15
We study the stellar population properties of the IRAC-detected galaxy candidates from the Spitzer UltRa Faint SUrvey Program (SURFS UP). Using the Lyman…
The Hidden Fortress: Structure and substructure of the complex strong lensing cluster SDSS J1029+2623
Masamune Oguri, Tim Schrabback, Eric Jullo +8
We present Hubble Space Telescope (HST) ACS and WFC3 observations of SDSS J1029+2623, a three-image quasar lens system produced by a foreground cluster at z=0.584. Our strong lensi…
COSMOS weak-lensing constraints on modified gravity
Ismael Tereno, Elisabetta Semboloni, Tim Schrabback
The observed acceleration of the universe, explained through dark energy, could alternatively be explained through a modification of gravity that would also induce modifications in…
J0454-0309: Evidence for a strong lensing fossil group falling into a poor galaxy cluster
Mischa Schirmer, Sherry Suyu, Tim Schrabback +3
We have discovered a strong lensing fossil group (J0454) at z=0.26, projected near the well-studied cluster MS0451-0305. Using multicolour Subaru/Suprime-Cam and CFHT/Megaprime ima…
The Shear TEsting Programme 2: Factors affecting high precision weak lensing analyses
Richard Massey, Catherine Heymans, Joel Berge +28
The Shear TEsting Programme (STEP) is a collaborative project to improve the accuracy and reliability of weak lensing measurement, in preparation for the next generation of wide-fi…
The SRG/eROSITA All-Sky Survey. The Weak-Lensing Mass Calibration and the Stellar Mass-to-Halo Mass Relation from the Hyper Suprime-Cam Subaru Strategic Program
I-Non Chiu, Vittorio Ghirardini, Sebastian Grandis +23
We present the weak-lensing mass calibration and constrain the BCG (brightest cluster galaxy) stellar-mass-to-halo-mass-and-redshift () relation for a s…
Spectroscopic confirmation of an ultra-faint galaxy at the epoch of reionization
Austin Hoag, MaruÅ¡a BradaÄ, Michele Trenti +11
Within one billion years of the Big Bang, intergalactic hydrogen was ionized by sources emitting ultraviolet and higher energy photons. This was the final phenomenon to globally af…
Weak lensing mass modeling bias and the impact of miscentring
Martin W. Sommer, Tim Schrabback, Douglas E. Applegate +4
Parametric modeling of galaxy cluster density profiles from weak lensing observations leads to a mass bias, whose detailed understanding is critical in deriving accurate mass-obser…
Handbook for the GREAT08 Challenge: An image analysis competition for cosmological lensing
Sarah Bridle, John Shawe-Taylor, Adam Amara +35
The GRavitational lEnsing Accuracy Testing 2008 (GREAT08) Challenge focuses on a problem that is of crucial importance for future observations in cosmology. The shapes of distant g…
Directional miscentering dependence in weak lensing mass bias
Martin W. Sommer, Tim Schrabback, Sebastian Grandis
Galaxy cluster masses estimated from parametric modeling of weak lensing shear observations are known to be biased by inaccuracies in observationally determined centers. It has rec…
The effect of the environment on the structure, morphology and star-formation history of intermediate-redshift galaxies
Kshitija Kelkar, Meghan E. Gray, Alfonso Aragon-Salamanca +4
With the aim of understanding the effect of the environment on the star formation history and morphological transformation of galaxies, we present a detailed analysis of the colour…
Weak lensing from space: first cosmological constraints from three-point shear statistics
Elisabetta Semboloni, Tim Schrabback, Ludovic van Waerbeke +3
We use weak lensing data from the Hubble Space Telescope COSMOS survey to measure the second- and third-moments of the cosmic shear field, estimated from about 450,000 galaxies wit…
Spitzer UltRa Faint SUrvey Program (SURFS UP) I: An Overview
MaruÅ¡a BradaÄ, Russell Ryan, Stefano Casertano +14
SURFSUP is a joint Spitzer and HST Exploration Science program using 10 galaxy clusters as cosmic telescopes to study z >~ 7 galaxies at intrinsically lower luminosities, enabled b…
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…
XMM-Newton X-ray and HST weak gravitational lensing study of the extremely X-ray luminous galaxy cluster ClJ120958.9+495352 ()
Sophia Thölken, Tim Schrabback, Thomas H. Reiprich +6
Observations of relaxed, massive and distant clusters can provide important tests of standard cosmological models e.g. using the gas mass fraction. We study the very luminous, high…
Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56
Marusa Bradac, Douglas Clowe, Anthony H. Gonzalez +7
The galaxy cluster 1E0657-56 (z = 0.296) is remarkably well-suited for addressing outstanding issues in both galaxy evolution and fundamental physics. We present a reconstruction o…
Discovery of a Ultra Steep Spectrum Radio Halo in the MeerKAT-South Pole Telescope Survey
Isaac S. Magolego, Roger P. Deane, Kshitij Thorat +15
Radio halos are diffuse synchrotron sources that trace the turbulent intracluster medium (ICM) of galaxy clusters. However, their origin remains unknown. Two main formation models…
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…
Gravitational Lensing Accuracy Testing 2010 (GREAT10) Challenge Handbook
Thomas Kitching, Sreekumar Balan, Gary Bernstein +32
GRavitational lEnsing Accuracy Testing 2010 (GREAT10) is a public image analysis challenge aimed at the development of algorithms to analyze astronomical images. Specifically, the…
RELICS: A Strong Lens Model for SPT-CLJ0615-5746, a z=0.972 Cluster
Rachel Paterno-Mahler, Keren Sharon, Dan Coe +30
We present a lens model for the cluster SPT-CLJ06155746, which is the highest redshift () system in the Reionization of Lensing Clusters Survey (RELICS), making it the…
Constraints on the shapes of galaxy dark matter haloes from weak gravitational lensing
Edo van Uitert, Henk Hoekstra, Tim Schrabback +3
We study the shapes of galaxy dark matter haloes by measuring the anisotropy of the weak gravitational lensing signal around galaxies in the second Red-sequence Cluster Survey (RCS…
Two Exciting High-redshift Galaxy Candidates Turn Out to Be Two Exciting Ultra-cool Brown Dwarfs
MaruÅ¡a BradaÄ, Chris Willott, Yoshihisa Asada +37
From the onset of observations of JWST we have discovered unexpectedly luminous galaxies at redshifts and as high as . With their discovery, the question immediately f…
Extending empirical constraints on the SZ-mass scaling relation to higher redshifts via HST weak lensing measurements of nine clusters from the SPT-SZ survey at
Hannah Zohren, Tim Schrabback, Sebastian Bocquet +17
We present a Hubble Space Telescope (HST) weak gravitational lensing study of nine distant and massive galaxy clusters with redshifts ($z_\mathrm{medi…
The SRG/eROSITA All-Sky Survey: Weak-Lensing of eRASS1 Galaxy Clusters in KiDS-1000 and Consistency Checks with DES Y3 & HSC-Y3
Florian Kleinebreil, Sebastian Grandis, Tim Schrabback +21
We aim to participate in the calibration of the X-ray photon count rate to halo mass scaling relation of galaxy clusters selected in the first eROSITA All-Sky Survey on the Western…
The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook
Rachel Mandelbaum, Barnaby Rowe, James Bosch +28
The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is the third in a series of image analysis challenges, with a goal of testing and facilitating the development of me…
The SRG/eROSITA All-Sky Survey : Subaru/HSC-SSP weak-lensing mass measurements for the eRASS1 Galaxy Clusters
Nobuhiro Okabe, Thomas H. Reiprich, Sebastian Grandis +20
We performed individual weak-lensing (WL) mass measurements for 78 eROSITA's first All-Sky Survey (eRASS1) clusters in the footprint of Hyper Suprime-Cam Subaru Strategic Program (…
The eROSITA Final Equatorial-Depth Survey (eFEDS): X-ray Properties and Scaling Relations of Galaxy Clusters and Groups
Y. Emre Bahar, Esra Bulbul, Nicolas Clerc +16
We investigate the scaling relations between X-ray observables of the clusters detected in the eFEDS field using Spectrum-Roentgen-Gamma/eROSITA observations taking into account th…
Origins of weak lensing systematics, and requirements on future instrumentation (or knowledge of instrumentation)
Richard Massey, Henk Hoekstra, Thomas Kitching +11
The first half of this paper explores the origin of systematic biases in the measurement of weak gravitational lensing. Compared to previous work, we expand the investigation of PS…
The Shear TEsting Programme 1: Weak lensing analysis of simulated ground-based observations
Catherine Heymans, Ludovic Van Waerbeke, David Bacon +22
The Shear TEsting Programme, STEP, is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for the next generation of wid…
The z=1.03 Merging Cluster SPT-CL J0356-5337: New Strong Lensing Analysis with HST and MUSE
Grace Smith, Guillaume Mahler, Kate Napier +8
We present a strong lensing analysis and reconstruct the mass distribution of SPT-CL J0356-5337, a galaxy cluster at redshift z = 1.034. Our model supersedes previous models by mak…
An improved model of Charge Transfer Inefficiency and correction algorithm for the Hubble Space Telescope
Richard Massey, Tim Schrabback, Oliver Cordes +7
Charge-Coupled Device (CCD) detectors, widely used to obtain digital imaging, can be damaged by high energy radiation. Degraded images appear blurred, because of an effect known as…
Direct Observation of Cosmic Strings via their Strong Gravitational Lensing Effect: II. Results from the HST/ACS Image Archive
Eric Morganson, Phil Marshall, Tommaso Treu +2
We have searched 4.5 square degrees of archival HST/ACS images for cosmic strings, identifying close pairs of similar, faint galaxies and selecting groups whose alignment is consis…
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…
Tightening weak lensing constraints on the ellipticity of galaxy-scale dark matter haloes
Tim Schrabback, Henk Hoekstra, Ludovic Van Waerbeke +19
Cosmological simulations predict that galaxies are embedded into triaxial dark matter haloes, which appear approximately elliptical in projection. Weak gravitational lensing allows…
Halo ellipticity of GAMA galaxy groups from KiDS weak lensing
Edo van Uitert, Henk Hoekstra, Benjamin Joachimi +14
We constrain the average halo ellipticity of ~2 600 galaxy groups from the Galaxy And Mass Assembly (GAMA) survey, using the weak gravitational lensing signal measured from the ove…
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.…
CFHTLenS: Co-evolution of galaxies and their dark matter haloes
Michael J. Hudson, Bryan R. Gillis, Jean Coupon +16
Galaxy-galaxy weak lensing is a direct probe of the mean matter distribution around galaxies. The depth and sky coverage of the CFHT Legacy Survey yield statistically significant g…
Mass Modeling of Frontier Fields Cluster MACS J1149.5+2223 Using Strong and Weak Lensing
Emily Quinn Finney, MaruÅ¡a BradaÄ, Kuang-Han Huang +8
We present a gravitational lensing model of MACS J1149.5+2223 using ultra-deep Hubble Frontier Fields imaging data and spectroscopic redshifts from HST grism and VLT/MUSE spectrosc…
Weak-lensing shear measurement with machine learning: teaching artificial neural networks about feature noise
Malte Tewes, Thibault Kuntzer, Reiko Nakajima +3
Cosmic shear is a primary cosmological probe for several present and upcoming surveys investigating dark matter and dark energy, such as Euclid or WFIRST. The probe requires an ext…
Validation of PSF Models for HST and Other Space-Based Observations
Bryan R. Gillis, Tim Schrabback, Ole Marggraf +4
Forthcoming space-based observations will require high-quality point-spread function (PSF) models for weak gravitational lensing measurements. One approach to generating these mode…
CFHTLenS: A Weak Lensing Shear Analysis of the 3D-Matched-Filter Galaxy Clusters
Jes Ford, Ludovic Van Waerbeke, Martha Milkeraitis +17
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…
Calibration of colour gradient bias in shear measurement using HST/CANDELS data
Xinzhong Er, Henk Hoekstra, Tim Schrabback +6
Accurate shape measurements are essential to infer cosmological parameters from large area weak gravitational lensing studies. The compact diffraction-limited point-spread function…
Dark Matter and Baryons in the Most X-ray Luminous and Merging Galaxy Cluster RX J1347.5-1145
MaruÅ¡a BradaÄ, Tim Schrabback, Thomas Erben +12
The galaxy cluster RX J1347-1145 is one of the most X-ray luminous and most massive clusters known. Its extreme mass makes it a prime target for studying issues addressing cluster…
Automated detection of galaxy-scale gravitational lenses in high resolution imaging data
Philip J. Marshall, David W. Hogg, Leonidas A. Moustakas +4
Lens modeling is the key to successful and meaningful automated strong galaxy-scale gravitational lens detection. We have implemented a lens-modeling "robot" that treats every brig…