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Related publications (59)

KiDS and Euclid: Cosmological implications of a pseudo angular power spectrum analysis of KiDS-1000 cosmic shear tomography

Georges Meylan, Huanyuan Shan, Richard Massey, Jean-Luc Starck, Yi Wang

We present a tomographic weak lensing analysis of the Kilo Degree Survey Data Release 4 (KiDS-1000), using a new pseudo angular power spectrum estimator (pseudo-C-l) under development for the ESA Euclid mission. Over 21 million galaxies with shape informat ...

EDP SCIENCES S A2022

Euclid: Searching for pair-instability supernovae with the Deep Survey

Georges Meylan, Frédéric Courbin, Giovanni Longo, Richard Massey, Yi Wang

Pair-instability supernovae are theorized supernovae that have not yet been observationally confirmed. They are predicted to exist in low-metallicity environments. Because overall metallicity becomes lower at higher redshifts, deep near-infrared transient ...

EDP SCIENCES S A2022

Euclid preparation XXI. Intermediate-redshift contaminants in the search for z > 6 galaxies within the Euclid Deep Survey

Georges Meylan, Frédéric Courbin, Hakim Atek, Richard Massey, Maurizio Martinelli, Jean-Luc Starck, Gianluca Castignani, Marcello Farina, Austin Chandler Peel, Yi Wang

Context. The Euclid mission is expected to discover thousands of z > 6 galaxies in three deep fields, which together will cover a similar to 50 deg(2) area. However, the limited number of Euclid bands (four) and the low availability of ancillary data could ...

EDP SCIENCES S A2022

Euclid : Effects of sample covariance on the number counts of galaxy clusters

Georges Meylan, Richard Massey, Yi Wang

Aims. We investigate the contribution of shot-noise and sample variance to uncertainties in the cosmological parameter constraints inferred from cluster number counts, in the context of the Euclid survey. ...

EDP SCIENCES S A2021

Euclid preparation: IX. EuclidEmulator2-power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations

Georges Meylan, Fabio Finelli, Richard Massey, Gianluca Castignani, Yi Wang

We present a new, updated version of the EuclidEmulator (called EuclidEmulator2), a fast and accurate predictor for the nonlinear correction of the matter power spectrum. 2 per cent level accurate emulation is now supported in the eight-dimensional paramet ...

OXFORD UNIV PRESS2021

Euclid preparation: XI. Mean redshift determination from galaxy redshift probabilities for cosmic shear tomography

Fabio Finelli, Richard Massey, Gianluca Castignani, Yi Wang

The analysis of weak gravitational lensing in wide-field imaging surveys is considered to be a major cosmological probe of dark energy. Our capacity to constrain the dark energy equation of state relies on an accurate knowledge of the galaxy mean redshift ...

2021

Euclid preparation: VII. Forecast validation for Euclid cosmological probes

Murat Kunt, Slobodan Ilic, Georges Meylan, Richard Massey, Maurizio Martinelli, Jean-Luc Starck, Yi Wang

Aims. The Euclid space telescope will measure the shapes and redshifts of galaxies to reconstruct the expansion history of the Universe and the growth of cosmic structures. The estimation of the expected performance of the experiment, in terms of predicted ...

EDP SCIENCES SA2020

Euclid preparation VIII. The Complete Calibration of the Colour-Redshift Relation survey: VLT/KMOS observations and data release

Murat Kunt, Santiago Serrano Guisan, Georges Meylan, Richard Massey, Gianluca Castignani, Yi Wang

The Complete Calibration of the Colour-Redshift Relation survey (C3R2) is a spectroscopic e ffort involving ESO and Keck facilities designed specifically to empirically calibrate the galaxy colour-redshift relation - P(z jC) to the Euclid depth (iAB = 24 : ...

EDP SCIENCES S A2020

The distribution of dark matter and gas spanning 6 Mpc around the post-merger galaxy cluster MS0451-03

Jean-Paul Richard Kneib, Richard Massey, David Richard Harvey, Baptiste Philippe Klein, Mathilde Jauzac

Using the largestmosaic of Hubble Space Telescope images around a galaxy cluster, we map the distribution of darkmatter throughout an similar to 6 x 6 Mpc(2) area centred on the clusterMS 0451-03 (z = 0.54, M-200 = 1.65 x 10(15) M-circle dot). Our joint st ...

OXFORD UNIV PRESS2020

Euclid: Reconstruction of weak-lensing mass maps for non-Gaussianity studies

Georges Meylan, Richard Massey, Yi Wang

Weak lensing, which is the deflection of light by matter along the line of sight, has proven to be an efficient method for constraining models of structure formation and reveal the nature of dark energy. So far, most weak-lensing studies have focused on th ...

EDP SCIENCES S A2020

The BUFFALO HST Survey

Johan Richard, Céline Tchernin, Matthieu Schaller, Pascale Jablonka, Jean-Paul Richard Kneib, Huanyuan Shan, Hakim Atek, Richard Massey, David Richard Harvey, Mathilde Jauzac, Benjamin Yvan Alexandre Clement, Anja Von der Linden

The Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) is a 101 orbit + 101 parallel Cycle 25 Hubble Space Telescope (HST) Treasury program taking data from 2018 to 2020. BUFFALO will expand existing coverage of the Hubble Frontier Fields ...

IOP PUBLISHING LTD2020

Euclid: The reduced shear approximation and magnification bias for Stage IV cosmic shear experiments

Georges Meylan, Richard Massey, Jean-Luc Starck, Yi Wang

Context. Stage IV weak lensing experiments will offer more than an order of magnitude leap in precision. We must therefore ensure that our analyses remain accurate in this new era. Accordingly, previously ignored systematic effects must be addressed.Aims. ...

EDP SCIENCES S A2020

Euclid: the selection of quiescent and star-forming galaxies using observed colours

Georges Meylan, Richard Massey, Yi Wang

The Euclid mission will observe well over a billion galaxies out to z similar to 6 and beyond. This will offer an unrivalled opportunity to investigate several key questions for understanding galaxy formation and evolution. The first step for many of these ...

OXFORD UNIV PRESS2020

The core of the massive cluster merger MACS J0417.5-1154 as seen by VLT/MUSE

Johan Richard, Johannes Richard Cornelis Geerit Kruis, Jean-Paul Richard Kneib, Richard Massey, David Richard Harvey, Mathilde Jauzac

We present a multiwavelength analysis of the core of the massive galaxy cluster MACS J0417.5-1154 (z = 0.441). Our analysis takes advantage of Very Large Telescope/Multi-Unit Spectroscopic Explorer observations which allowthe spectroscopic confirmation of ...

OXFORD UNIV PRESS2019

Observable tests of self-interacting dark matter in galaxy clusters: BCG wobbles in a constant density core

Richard Massey, David Richard Harvey

Models of cold dark matter (CDM) predict that the distribution of dark matter in galaxy clusters should be cuspy, centrally concentrated. Constant density cores would be strong evidence for beyond CDM physics, such as self-interacting dark matter (SIDM). A ...

OXFORD UNIV PRESS2019

Euclid preparation V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey

Georges Meylan, Richard Massey, Yi Wang

We provide predictions of the yield of 7 < z < 9 quasars from the Euclid wide survey, updating the calculation presented in the Euclid Red Book in several ways. We account for revisions to the Euclid near-infrared filter wavelengths; we adopt steeper rates ...

EDP SCIENCES S A2019

Growing a 'cosmic beast': observations and simulations of MACS J0717.5+3745

Elena Cristina Dalla Vecchia, Matthieu Schaller, Jean-Paul Richard Kneib, Richard Massey, David Richard Harvey, Matthew Aaron Robertson, Barney Frederick Drake, Mathilde Jauzac

We present a gravitational lensing and X-ray analysis of a massive galaxy cluster and its surroundings. The core of MACS J0717.5+3745 (M(R < 1Mpc) similar to 2 x 10(15) M-circle dot, z = 0.54) is already known to contain four merging components. We show th ...

OXFORD UNIV PRESS2018

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Richard Massey

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KiDS and Euclid: Cosmological implications of a pseudo angular power spectrum analysis of KiDS-1000 cosmic shear tomography

Euclid: Searching for pair-instability supernovae with the Deep Survey

Euclid preparation XXI. Intermediate-redshift contaminants in the search for z > 6 galaxies within the Euclid Deep Survey

Euclid : Effects of sample covariance on the number counts of galaxy clusters

Euclid preparation: IX. EuclidEmulator2-power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations

Euclid preparation: XI. Mean redshift determination from galaxy redshift probabilities for cosmic shear tomography

Euclid preparation: VII. Forecast validation for Euclid cosmological probes

Euclid preparation VIII. The Complete Calibration of the Colour-Redshift Relation survey: VLT/KMOS observations and data release

The distribution of dark matter and gas spanning 6 Mpc around the post-merger galaxy cluster MS0451-03

Euclid: Reconstruction of weak-lensing mass maps for non-Gaussianity studies

The BUFFALO HST Survey

Euclid: The reduced shear approximation and magnification bias for Stage IV cosmic shear experiments

Euclid: the selection of quiescent and star-forming galaxies using observed colours

The core of the massive cluster merger MACS J0417.5-1154 as seen by VLT/MUSE

Observable tests of self-interacting dark matter in galaxy clusters: BCG wobbles in a constant density core

Euclid preparation V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey

Growing a 'cosmic beast': observations and simulations of MACS J0717.5+3745

Dark matter dynamics in Abell 3827: new data consistent with standard cold dark matter

The shape of galaxy dark matter haloes in massive galaxy clusters: insights from strong gravitational lensing

What if LIGO's gravitational wave detections are strongly lensed by massive galaxy clusters?