Publications associées à Nine lensed quasars and quasar pairs discovered through spatially extended variability in Pan-STARRS

Publications associées (9)

ELG spectroscopic systematics analysis of the DESI Data Release 1

Jean-Paul Richard Kneib, Jiaxi Yu, Daniel Felipe Forero Sanchez, Antoine Philippe Jacques Rocher

Dark Energy Spectroscopic Instrument (DESI) uses more than 2.4 million Emission Line Galaxies (ELGs) for 3D large-scale structure (LSS) analyses in its Data Release 1 (DR1). Such large statistics enable thorough research on systematic uncertainties. In thi ...

IOP Publishing Ltd2025

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

Frédéric Courbin, Georges Meylan

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

Absolute calibration of standard candles in the Gaia era

Mauricio Cruz Reyes

Measuring the distance to stars in relation to us is fundamental for understanding the universe we live in, however, it is also one of the most challenging tasks in astronomy. Accurately estimating distances would allow us to understand the distribution of ...

EPFL2025

A Brief History of Cosmology with Galaxy-Halo Relation and Systematics in Redshift Surveys

Jiaxi Yu

This dissertation traces the evolution of cosmology from its foundational theories to the forefront of modern observational studies, with a particular focus on the role of large-scale structure (LSS) probes. It begins with the establishment of General Rela ...

EPFL2024

Euclid preparation: L. Calibration of the halo linear bias in Λ(v)CDM cosmologies

Frédéric Courbin, Georges Meylan

The Euclid mission, designed to map the geometry of the dark Universe, presents an unprecedented opportunity for advancing our understanding of the cosmos through its photometric galaxy cluster survey. Central to this endeavor is the accurate calibration o ...

2024

The AGORA High-resolution Galaxy Simulations Comparison Project. IV. Halo and Galaxy Mass Assembly in a Cosmological Zoom-in Simulation at z ≤ 2

Yves Revaz, Loïc Hausammann

In this fourth paper from the AGORA Collaboration, we study the evolution down to redshift z = 2 and below of a set of cosmological zoom-in simulations of a Milky Way mass galaxy by eight of the leading hydrodynamic simulation codes. We also compare this C ...

2024

The JWST PEARLS View of the El Gordo Galaxy Cluster and of the Structure It Magnifies

Benjamin Emmanuel Nicolas Beauchesne

The massive galaxy cluster El Gordo (z = 0.87) imprints multitudes of gravitationally lensed arcs onto James Webb Space Telescope Near-Infrared Camera (NIRCam) images. Eight bands of NIRCam imaging were obtained in the "Prime Extragalactic Areas for Reioni ...

IOP Publishing Ltd2023

Euclid preparation XXIV. Calibration of the halo mass function in λ(ν)CDM cosmologies

Maurizio Martinelli, Frédéric Courbin, Georges Meylan, Slobodan Ilic, Gianluca Castignani, Austin Chandler Peel

Euclid's photometric galaxy cluster survey has the potential to be a very competitive cosmological probe. The main cosmological probe with observations of clusters is their number count, within which the halo mass function (HMF) is a key theoretical quanti ...

EDP SCIENCES S A2023

H alpha-based star formation rates in and around z similar to 0.5 EDisCS clusters

Pascale Jablonka, Damien Louis Alexandre Spérone-Longin

We investigate the role of environment on star formation rates (SFRs) of galaxies at various cosmic densities in well-studied clusters. We present the star-forming main sequence for 163 galaxies in four EDisCS clusters in the range 0.4 < z < 0.7. We use Hu ...

OXFORD UNIV PRESS2022