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Richard Massey

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Publications associées (59)

Looking for dark matter trails in colliding galaxy clusters

Jean-Paul Richard Kneib, Richard Massey, David Richard Harvey

If dark matter interacts, even weakly, via non-gravitational forces, simulations predict that it will be preferentially scattered towards the trailing edge of the halo during collisions between galaxy clusters. This will temporarily create a non-symmetric ...

Oxford Univ Press2017

A gravitationally boosted MUSE survey for emission-line galaxies at z greater than or similar to 5 behind the massive cluster RCS 0224

Johan Richard, Jean-Paul Richard Kneib, Richard Massey

We present a Very Large Telescope/Multi Unit Spectroscopic Explorer (MUSE) survey of lensed high-redshift galaxies behind the z = 0.77 cluster RCS 0224-0002. We study the detailed internal properties of a highly magnified (mu similar to 29) z = 4.88 galaxy ...

Oxford Univ Press2017

A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827

Frédéric Courbin, Richard Massey, Rémy Elie Joseph, David Richard Harvey, Mathilde Jauzac

Simulations of self-interacting dark matter predict that dark matter should lag behind galaxies during a collision. If the interaction is mediated by a high-mass force carrier, the distribution of dark matter can also develop asymmetric dark matter tails. ...

Oxford Univ Press2017

Abell 2744: too much substructure for Lambda CDM?

Richard Massey, David Richard Harvey, Mathilde Jauzac

The massive substructures found in Abell 2744 by Jauzac et al. present a challenge to the cold dark matter paradigm due to their number and proximity to the cluster centre. We use one of the biggest N-body simulations, the Millennium XXL, to investigate th ...

Oxford Univ Press2017

Hubble Frontier Fields: predictions for the return of SN Refsdal with the MUSE and GMOS spectrographs

Johan Richard, Jean-Paul Richard Kneib, Hakim Atek, Richard Massey, Markus Rexroth, Mathilde Jauzac, Benjamin Yvan Alexandre Clement

We present a high-precision mass model of the galaxy cluster MACS J1149.6+ 2223, based on a strong gravitational lensing analysis of Hubble Space Telescope Frontier Fields (HFF) imaging data and spectroscopic follow-up with Gemini/Gemini Multi-Object Spect ...

Oxford Univ Press2016

The extraordinary amount of substructure in the Hubble Frontier Fields cluster Abell 2744

Johan Richard, Céline Tchernin, Jean-Paul Richard Kneib, Huanyuan Shan, Hakim Atek, Richard Massey, Markus Rexroth, David Richard Harvey, Mathilde Jauzac, Benjamin Yvan Alexandre Clement

We present a joint optical/X-ray analysis of the massive galaxy cluster Abell 2744 (z = 0.308). Our strong- and weak-lensing analysis within the central region of the cluster, i.e. at R < 1 Mpc from the brightest cluster galaxy, reveals eight substructures ...

Oxford Univ Press2016

Warm-hot baryons comprise 5-10 per cent of filaments in the cosmic web

Johan Richard, Céline Tchernin, Jean-Paul Richard Kneib, Huanyuan Shan, Richard Massey, Mathilde Jauzac

Observations of the cosmic microwave background indicate that baryons account for 5 per cent of the Universe's total energy content(1). In the local Universe, the census of all observed baryons falls short of this estimate by a factor of two(2,3). Cosmolog ...

Nature Publishing Group2015

The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827

Johan Richard, Richard Massey, David Richard Harvey, Mathilde Jauzac

Galaxy cluster Abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10 kpc. Such corrugation of the stellar distribution is very rare, and suggests recent formation by several simultaneous mergers. ...

Oxford University Press2015

Hubble Frontier Fields: the geometry and dynamics of the massive galaxy cluster merger MACSJ0416.1-2403

Johan Richard, Jean-Paul Richard Kneib, Hakim Atek, Richard Massey, Markus Rexroth, David Richard Harvey, Mathilde Jauzac, Benjamin Yvan Alexandre Clement

We use a joint optical/X-ray analysis to constrain the geometry and history of the ongoing merging event in the massive galaxy cluster MACSJ0416.1-2403 (z = 0.397). Our investigation of cluster substructure rests primarily on a combined strong-and weak-len ...

Wiley-Blackwell2015

Hubble Frontier Fields: a high-precision strong-lensing analysis of the massive galaxy cluster Abell 2744 using similar to 180 multiple images

Johan Richard, Jean-Paul Richard Kneib, Hakim Atek, Richard Massey, Markus Rexroth, Mathilde Jauzac, Benjamin Yvan Alexandre Clement

We present a high-precision mass model of galaxy cluster Abell 2744, based on a strong gravitational-lensing analysis of the Hubble Space Telescope Frontier Fields (HFF) imaging data, which now include both Advanced Camera for Surveys and Wide Field Camera ...

Oxford University Press2015

The nongravitational interactions of dark matter in colliding galaxy clusters

Richard Massey, David Richard Harvey

Collisions between galaxy clusters provide a test of the nongravitational forces acting on dark matter. Dark matter's lack of deceleration in the "bullet cluster" collision constrained its self-interaction cross section sigma(DM)/m

American Association for the Advancement of Science2015

Hubble Frontier Fields: a high-precision strong-lensing analysis of galaxy cluster MACSJ0416.1-2403 using similar to 200 multiple images

Johan Richard, Jean-Paul Richard Kneib, Hakim Atek, Richard Massey, Markus Rexroth, Mathilde Jauzac, Benjamin Yvan Alexandre Clement

We present a high-precision mass model of the galaxy cluster MACSJ0416.1-2403, based on a strong-gravitational-lensing analysis of the recently acquired Hubble Space Telescope Frontier Fields (HFF) imaging data. Taking advantage of the unprecedented depth ...

Oxford University Press2014

The zCOSMOS redshift survey: evolution of the light in bulges and discs since z similar to 0.8

Angelo Bongiorno, Jean-Paul Richard Kneib, Richard Massey, Yatao Peng

We studied the chronology of galactic bulge and disc formation by analysing the relative contributions of these components to the B-band rest-frame luminosity density at different epochs. We present the first estimate of the evolution of the fraction of re ...

EDP Sciences2014

The Third Gravitational Lensing Accuracy Testing (Great3) Challenge Handbook

Frédéric Courbin, Marc Gentile, Richard Massey

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 methods for analyzing astronomical images that will be used to measure weak gr ...

University of Chicago Press2014

Image Analysis For Cosmology: Results From The Great10 Star Challenge

Georges Meylan, Frédéric Courbin, Marc Gentile, Richard Massey

We present the results from the first public blind point-spread function (PSF) reconstruction challenge, the GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Star Challenge. Reconstruction of a spatially varying PSF, sparsely sampled by stars, at non- ...

University of Chicago Press2013

Image analysis for cosmology: results from the GREAT10 Galaxy Challenge

Nicolas Cantale, Malte Tewes, Frédéric Courbin, Marc Gentile, Guldariya Nurbaeva, Richard Massey

In this paper, we present results from the weak-lensing shape measurement GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Galaxy Challenge. This marks an order of magnitude step change in the level of scrutiny employed in weak-lensing shape measureme ...

Blackwell Publishing Ltd, Oxford2012

Gravitational Lensing Accuracy Testing 2010 (Great10) Challenge Handbook

Frédéric Courbin, Marc Gentile, Guldariya Nurbaeva, Anaïs Marie Rassat, Richard Massey, Michael Hirsch, Matthias Bethge

GRavitational lEnsing Accuracy Testing 2010 (GREAT10) is a public image analysis challenge aimed at the development of algorithms to analyze astronomical images. Specifically, the challenge is to measure varying image distortions in the presence of a varia ...

2011

Results of the GREAT08 Challenge: an image analysis competition for cosmological lensing

Frédéric Courbin, Marc Gentile, Anaïs Marie Rassat, Richard Massey, Michael Hirsch, Matthias Bethge

We present the results of the Gravitational LEnsing Accuracy Testing 2008 (GREAT08) Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. The primary goal was to stimulate new ideas by presenting the probl ...

Blackwell Publishing Ltd, Oxford2010

On The Contribution Of Large-Scale Structure To Strong Gravitational Lensing

Jean-Paul Richard Kneib, Richard Massey

We study the correlation between the locations of galaxy-galaxy strong-lensing candidates and tracers of large-scale structure from both weak lensing (WL) or X-ray emission. The Cosmological Evolution Survey (COSMOS) is a unique data set, combining deep, h ...

2009

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