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Frédéric Courbin

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Publications associées (229)

Euclid preparation: LV. Exploring the properties of proto-clusters in the Simulated Euclid Wide Survey

Georges Meylan, Frédéric Courbin

Galaxy proto-clusters are receiving increased interest since most of the processes shaping the structure of clusters of galaxies and their galaxy population happen at the early stages of their formation. The Euclid Survey will provide a unique opportunity ...

2025

Euclid: Detecting Solar System objects in Euclid images and classifying them using Kohonen self-organising maps

Georges Meylan, Frédéric Courbin

The ESA Euclid mission will survey more than 14 000 deg2 of the sky in visible and near-infrared wavelengths, mapping the extragalactic sky to constrain our cosmological model of the Universe. Although the survey focusses on regions further than 15 from th ...

2025

Euclid preparation LX. The use of HST images as input for weak-lensing image simulations

Georges Meylan, Frédéric Courbin

Data from the Euclid space telescope will enable cosmic shear measurements to be carried out with very small statistical errors, necessitating a corresponding level of systematic error control. A common approach to correct for shear biases involves calibra ...

EDP SCIENCES S A2025

Euclid preparation: LXVIII. Extracting physical parameters from galaxies with machine learning

Georges Meylan, Frédéric Courbin

The Euclid mission is generating a vast amount of imaging data in four broadband filters at a high angular resolution. This data will allow for the detailed study of mass, metallicity, and stellar populations across galaxies that will constrain their forma ...

2025

Euclid: Early Release Observations – Overview of the Perseus cluster and analysis of its luminosity and stellar mass functions

Georges Meylan, Frédéric Courbin, Pascale Jablonka

The Euclid Early Release Observations (ERO) programme targeted the Perseus cluster of galaxies, gathering deep data in the central region of the cluster over 0.7 deg2, including the cluster core up to 0.25 r200. The dataset reaches a point-source depth of ...

2025

Euclid: Early Release Observations – A preview of the Euclid era through a galaxy cluster magnifying lens

Georges Meylan, Frédéric Courbin, Jean-Paul Richard Kneib

We present the first analysis of the Euclid Early Release Observations (ERO) program that targets fields around two lensing clusters, Abell 2390 and Abell 2764. We use imaging data from the Visible instrument (VIS) and the Near-Infrared Spectrometer and Ph ...

2025

Euclid V. The Flagship galaxy mock catalogue: A comprehensive simulation for the Euclid mission

Georges Meylan, Frédéric Courbin

We present the Flagship galaxy mock, a simulated catalogue of billions of galaxies designed to support the scientific exploitation of the Euclid mission. Euclid is a medium-class mission of the European Space Agency optimised to determine the properties of ...

2025

Euclid IV. The NISP Calibration Unit

Georges Meylan, Frédéric Courbin

The near-infrared calibration unit (NI-CU) on board Euclid’s Near-Infrared Spectrometer and Photometer (NISP) is the first astronomical calibration lamp based on light-emitting diodes (LEDs) to be operated in space. Euclid is a mission in ESA’s Cosmic Visi ...

2025

Euclid preparation: LXIV. The Cosmic Dawn Survey (DAWN) of the Euclid Deep and Auxiliary Fields

Georges Meylan, Frédéric Courbin

Euclid will provide deep near-infrared (NIR) imaging to ∼26.5 AB magnitude over ∼59 deg2 in its deep and auxiliary fields. The Cosmic DAWN survey combines dedicated and archival UV- NIR observations to provide matched depth multiwavelength imaging of the E ...

2025

Euclid preparation: LXI. Cosmic Dawn Survey: ' Pre-launch' multiwavelength catalogues for Euclid Deep Field North and Euclid Deep Field Fornax

Georges Meylan, Frédéric Courbin

The Cosmic Dawn Survey (DAWN survey) provides multiwavelength (UV/optical to mid-IR) data across the combined 59 deg2 of the Euclid Deep and Auxiliary fields (EDFs and EAFs). In this work, the first public data release from the DAWN survey is presented. Th ...

2025

Joint Multiband Deconvolution for Euclid and Vera C. Rubin Images

Frédéric Courbin, Pascale Jablonka, Utsav Akhaury

With the advent of surveys like Euclid and Vera C. Rubin, astrophysicists will have access to both deep, high-resolution images and multiband images. However, these two types are not simultaneously available in any single dataset. It is therefore vital to ...

EDP SCIENCES S A2025

Euclid: Early Release Observations - A glance at free-floating newborn planets in the σ Orionis cluster

Georges Meylan, Frédéric Courbin

We provide an early assessment of the imaging capabilities of the Euclid space mission to deeply probe nearby star-forming regions and associated very young open clusters, and in particular, to determine to which extent it can shed light into the newborn f ...

2025

Tdcosmo Xvii. New Time Delays in 22 Lensed Quasars From Optical Monitoring with the Eso-vst 2.6m and Mpg 2.2m Telescopes

Frédéric Courbin, Vivien François Bonvin, Aymeric Alexandre Galan, Eric Gérard Guy Paic, Cameron Alexander Campbell Lemon

We present new time delays, the main ingredient of time delay cosmography, for 22 lensed quasars resulting from high-cadence r-band monitoring on the 2.6 m ESO VLT Survey Telescope and Max-Planck-Gesellschaft 2.2 m telescope. Each lensed quasar was typical ...

EDP SCIENCES S A2025

Euclid: Early Release Observations – NISP-only sources and the search for luminous z = 6–8 galaxies

Georges Meylan, Frédéric Courbin

This paper presents a search for high redshift galaxies from the Euclid Early Release Observations program ‘Magnifying Lens.’ The 1.5 deg2 area covered by the twin Abell lensing cluster fields is comparable in size to the few other deep near-infrared surve ...

2025

Euclid I. Overview of the Euclid mission

Yves Revaz, Georges Meylan, Frédéric Courbin, Pascale Jablonka, Jean-Paul Richard Kneib, Austin Chandler Peel, Michaela Hirschmann, Lucie Anemone Scharré

The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown. Euclid is a medium-class mission in the Cosmic Vision 2015–2025 programme of the ...

2025

Euclid: The potential of slitless infrared spectroscopy: A z = 5.4 quasar and new ultracool dwarfs

Georges Meylan, Frédéric Courbin

We demonstrate the potential of Euclid’s slitless spectroscopy to discover high-redshift (z > 5) quasars and their main photometric contaminant, ultracool dwarfs. Sensitive infrared spectroscopy from space is able to efficiently identify both population ...

Oxford University Press (OUP)2025

Euclid: Early Release Observations – The intracluster light and intracluster globular clusters of the Perseus cluster

Georges Meylan, Frédéric Courbin

We study the intracluster light (ICL) and intracluster globular clusters (ICGCs) in the nearby Perseus cluster of galaxies using Euclid’s Early Release Observations. By modelling the isophotal and iso-density contours, we mapped the distributions and prope ...

2025

Euclid preparation LXIX. The impact of relativistic redshift-space distortions on two-point clustering statistics from the Euclid wide spectroscopic survey

Georges Meylan, Frédéric Courbin

Measurements of galaxy clustering are affected by redshift-space distortions (RSDs). Peculiar velocities, gravitational lensing, and other light-cone projection effects modify the observed redshifts, fluxes, and sky positions of distant light sources. We d ...

2025

euclid Preparation: Lxiii. Simulations and Non-linearities Beyond Lambda Cold Dark Matter. 2. Results From Non-standard Simulations

Georges Meylan, Frédéric Courbin

The Euclid mission will measure cosmological parameters with unprecedented precision. To distinguish between cosmological models, it is essential to generate realistic mock observables from cosmological simulations that were run in both the standard Lambda ...

EDP SCIENCES S A2025

Euclid: High-precision imaging astrometry and photometry from Early Release Observations I. Internal kinematics of NGC 6397 by combining Euclid and Gaia data

Frédéric Courbin

The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry f ...

2024

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