Concept
Observational astronomy
Related publications (51)
Time-Delay Cosmography: Measuring the Hubble Constant and Other Cosmological Parameters with Strong Gravitational Lensing
Frédéric Courbin, Martin Raoul Robert Millon
Multiply lensed images of a same source experience a relative time delay in the arrival of photons due to the path length difference and the different gravitational potentials the photons travel through. This effect can be used to measure absolute distance ...
Springer2024Turbulence in the Strongly Heterogeneous Near-Surface Boundary Layer over Patchy Snow
Michael Lehning, Dylan Stewart Reynolds, Michael Haugeneder
The near-surface boundary layer above patchy snow cover in mountainous terrain is characterized by a highly complex interplay of various flows on multiple scales. In this study, we present data from a comprehensive field campaign that cover a period of 21 ...
2024The Pristine dwarf galaxy survey-V. The edges of the dwarf galaxy Hercules
Pascale Jablonka, Nicolas Lawrence Etienne Longeard
We present a new spectroscopic study of 175 stars in the vicinity of the dwarf galaxy Hercules (d similar to 132 kpc) with data from the Anglo-Australian Telescope and its AAOmega spectrograph together with the Two Degree Field multi-object system to solve ...
OXFORD UNIV PRESS2023Potential scientific synergies in weak lensing studies between the CSST and Euclid space probes
Jean-Paul Richard Kneib, Jean-Luc Starck, Huanyuan Shan
Aims. With the next generation of large surveys poised to join the ranks of observational cosmology in the near future, it is important to explore their potential synergies and to maximize their scientific outcomes. In this study, we aim to investigate the ...
EDP SCIENCES S A2023Euclid preparation XXII. Selection of quiescent galaxies from mock photometry using machine learning
Frédéric Courbin, Georges Meylan, Gianluca Castignani, Austin Chandler Peel, Maurizio Martinelli, Yi Wang, Richard Massey, Fabio Finelli, Marcello Farina
The Euclid Space Telescope will provide deep imaging at optical and near-infrared wavelengths, along with slitless near-infrared spectroscopy, across similar to 15 000deg(2) of the sky. Euclid is expected to detect similar to 12 billion astronomical source ...
EDP SCIENCES S A2023In situ monitoring of femtosecond laser-induced modifications in dielectrics
Over the last decades, the progress made in the generation of laser pulses shorter than a picosecond (10^-12 s) has allowed us to reach extreme optical power intensities exceeding 10^15 W cm^-2. This tremendous power has triggered an abundance of original ...
EPFL2023Model-based electron density estimation using multiple diagnostics on TCV
Olivier Sauter, Federico Alberto Alfredo Felici, Cristian Galperti
Estimation of the dynamic evolution of the electron plasma density during a tokamak discharge is crucial since it directly affects the plasma performance, confinement and stability. Therefore it needs to be monitored and controlled. Knowledge of the densit ...
ELSEVIER SCIENCE SA2023Element- and enantiomer-selective visualization of molecular motion in real-time
Majed Chergui, Malte Oppermann, Jérémy Raymond Jean Maurice Rouxel
Ultrafast optical-domain spectroscopies allow to monitor in real time the motion of nuclei in molecules. Achieving element-selectivity had to await the advent of time resolved X-ray spectroscopy, which is now commonly carried at X-ray free electron lasers. ...
Berlin2023The very knotty lenser: Exploring the role of regularization in source and potential reconstructions using Gaussian process regression
Reconstructing lens potentials and lensed sources can easily become an underconstrained problem, even when the degrees of freedom are low, due to degeneracies, particularly when potential perturbations superimposed on a smooth lens are included. Regulariza ...
OXFORD UNIV PRESS2022Euclid: Searching for pair-instability supernovae with the Deep Survey
Frédéric Courbin, Georges Meylan, Giovanni Longo, Yi Wang, Richard Massey
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