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Georges Meylan

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Related publications (182)

European Astronomical Society prizes 2020

The European Astronomical Society awarded its most prestigious prizes during its annual meeting held from 29 June to 3 July 2020. The meeting was entirely virtual and the largest such gathering of astrophysicists so far. ...

2020

Euclid: Forecast constraints on the cosmic distance duality relation with complementary external probes

Georges Meylan

Context. In metric theories of gravity with photon number conservation, the luminosity and angular diameter distances are related via the Etherington relation, also known as the distance duality relation (DDR). A violation of this relation would rule out t ...

EDP SCIENCES S A2020

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

STRIDES: Spectroscopic and photometric characterization of the environment and effects of mass along the line of sight to the gravitational lenses DES J0408-5354 and WGD 2038-4008

Georges Meylan

In time-delay cosmography, three of the key ingredients are (1) determining the velocity dispersion of the lensing galaxy, (2) identifying galaxies and groups along the line of sight with sufficient proximity and mass to be included in the mass model, and ...

OXFORD UNIV PRESS2020

H0LiCOW-IX. Cosmographic analysis of the doubly imaged quasar SDSS 1206+4332 and a new measurement of the Hubble constant

Georges Meylan, Frédéric Courbin, Vivien François Bonvin, Riccardo Agnello, Hung-Hsu Chan, Adriano Agnello

We present a blind time-delay strong lensing (TDSL) cosmographic analysis of the doubly imaged quasar SDSS 1206+4332. We combine the relative time delay between the quasar images, Hubble Space Telescope imaging, the Keck stellar velocity dispersion of the ...

OXFORD UNIV PRESS2019

COSMOGRAIL XVIII. time delays of the quadruply lensed quasar WFI2033-4723

Malte Tewes, Georges Meylan, Frédéric Courbin, Sun Hee Kim, Vivien François Bonvin, Martin Raoul Robert Millon, Hung-Hsu Chan, Karina Alexandra Rojas Olate

We present new measurements of the time delays of WFI2033-4723. The data sets used in this work include 14 years of data taken at the 1.2 m Leonhard Euler Swiss telescope, 13 years of data from the SMARTS 1.3 m telescope at Las Campanas Observatory and a s ...

2019

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

European Astronomical Society prizes 2019

Georges Meylan

2019

The STRong lensing Insights into the Dark Energy Survey (STRIDES) 2016 follow-up campaign - I. Overview and classification of candidates selected by two techniques

Eduardo Sanchez, Georges Meylan, Frédéric Courbin, Joo Yeon Kim, Craig Matthew Smith, Riccardo Agnello, Augusto Martins Lima, Hung-Hsu Chan, Karina Alexandra Rojas Olate, Cameron Alexander Campbell Lemon, Adriano Agnello

The primary goals of the STRong lensing Insights into the Dark Energy Survey (STRIDES) collaboration are to measure the dark energy equation of state parameter and the free streaming length of dark matter. To this aim, STRIDES is discovering strongly lense ...

OXFORD UNIV PRESS2018

COSMOGRAIL XVII. Time delays for the quadruply imaged quasar PG 1115+080

Malte Tewes, Georges Meylan, Frédéric Courbin, Sun Hee Kim, Vivien François Bonvin, Martin Raoul Robert Millon, Eric Gérard Guy Paic, Hung-Hsu Chan, Karina Alexandra Rojas Olate

We present time-delay estimates for the quadruply imaged quasar PG 1115+080. Our results are based on almost daily observations for seven months at the ESO MPIA 2.2m telescope at La Silla Observatory, reaching a signal-to-noise ratio of about 1000 per quas ...

EDP SCIENCES S A2018

H0LiCOW VIII. A weak-lensing measurement of the external convergence in the field of the lensed quasar HE0435-1223

Georges Meylan, Frédéric Courbin, Vivien François Bonvin, David Richard Harvey, Olga Tihhonova

2018

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses

Eduardo Sanchez, Malte Tewes, Georges Meylan, Frédéric Courbin, Sun Hee Kim, Vivien François Bonvin, Eric Gérard Guy Paic, Karina Alexandra Rojas Olate, Adriano Agnello

2018

DES meets Gaia: discovery of strongly lensed quasars from a multiplet search

Georges Meylan, Frédéric Courbin, Karina Alexandra Rojas Olate, Adriano Agnello

2018

Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens

Johan Richard, Georges Meylan, Frédéric Courbin, Jean-Paul Richard Kneib, Mathilde Jauzac, Karina Alexandra Rojas Olate, Xin Wang, Adriano Agnello

2018

European Astronomical Society prizes 2018

Georges Meylan

2018

H0LiCOW-I. H-0 Lenses in COSMOGRAIL's Wellspring: program overview

Malte Tewes, Georges Meylan, Frédéric Courbin, Vivien François Bonvin, Olga Tihhonova, Adriano Agnello

Strong gravitational lens systems with time delays between the multiple images allow measurements of time-delay distances, which are primarily sensitive to the Hubble constant that is key to probing dark energy, neutrino physics and the spatial curvature o ...

Oxford Univ Press2017

European Astronomical Society prizes 2017

Georges Meylan

Nature Publishing Group2017

H0LiCOW-V. New COSMOGRAIL time delays of HE 0435-1223: H-0 to 3.8 per cent precision from strong lensing in a flat Lambda CDM model

Malte Tewes, Georges Meylan, Frédéric Courbin, Vivien François Bonvin

We present a new measurement of the Hubble Constant H-0 and other cosmological parameters based on the joint analysis of three multiply imaged quasar systems with measured gravitational time delays. First, we measure the time delay of HE 0435-1223 from 13- ...

Oxford Univ Press2017

H0LiCOW-II. Spectroscopic survey and galaxy-group identification of the strong gravitational lens system HE 0435-1223

Malte Tewes, Georges Meylan, Frédéric Courbin, Vivien François Bonvin

Galaxies located in the environment or along the line of sight towards gravitational lenses can significantly affect lensing observables, and can lead to systematic errors on the measurement of H-0 from the time-delay technique. We present the results of a ...

Oxford Univ Press2017

Models of the strongly lensed quasar DES J0408-5354

Eduardo Sanchez, Georges Meylan, Frédéric Courbin, Vivien François Bonvin, Hung-Hsu Chan, Cameron Alexander Campbell Lemon, Adriano Agnello

We present detailed modelling of the recently discovered, quadruply lensed quasar J0408-5354, with the aim of interpreting its remarkable configuration: besides three quasar images (A, B, D) around the main deflector (G1), a fourth image (C) is significant ...

Oxford Univ Press2017

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