J. A. Acevedo Barroso
A5046135823- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Gaussian Processes and Bayesian Inference
- Historical Astronomy and Related Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- History and Developments in Astronomy
- Historical and Architectural Studies
- Statistical and numerical algorithms
- Advanced Measurement and Metrology Techniques
- Biblical Studies and Interpretation
École Polytechnique Fédérale de Lausanne
2022-2025
The current standard model of cosmology successfully describes a variety measurements, but the nature its main ingredients, dark matter and energy, remains unknown. is medium-class mission in Cosmic Vision 2015--2025 programme European Space Agency (ESA) that will provide high-resolution optical imaging, as well near-infrared imaging spectroscopy, over about 14\,000\,deg$^2$ extragalactic sky. In addition to accurate weak lensing clustering measurements probe structure formation half age...
We investigate the ability of Euclid telescope to detect galaxy-scale gravitational lenses. To do so, we perform a systematic visual inspection $0.7\,\rm{deg}^2$ ERO data towards Perseus cluster using both high-resolution VIS $I_{\scriptscriptstyle\rm E}$ band, and lower resolution NISP bands. inspect every extended source brighter than magnitude $23$ in with $41$ expert human classifiers. This amounts $12\,086$ stamps $10^{\prime\prime}\,\times\,10^{\prime\prime}$. find $3$ grade A $13$ B...
We report the discovery of a complete Einstein ring around elliptical galaxy NGC 6505, at $z=0.042$. This is first strong gravitational lens discovered in Euclid and an object from any survey. The combination low redshift galaxy, brightness source ($I_\mathrm{E}=18.1$ lensed, $I_\mathrm{E}=21.3$ unlensed), completeness make this exceptionally rare lens, unidentified until its observation by Euclid. present deep imaging data Visible Camera (VIS) Near-Infrared Spectrometer Photometer (NISP)...
The Early Release Observations (ERO) from Euclid have detected several new galaxy-galaxy strong gravitational lenses, with the all-sky survey expected to find 170,000 systems, greatly enhancing studies of dark matter, energy, and constraints on cosmological parameters. As a first step, visual inspection all galaxies in one ERO fields (Perseus) was carried out identify candidate lensing systems compared predictions Convolutional Neural Networks (CNNs). However, entire data set is too large...
ABSTRACT We investigate the ability of human ‘expert’ classifiers to identify strong gravitational lens candidates in Dark Energy Survey like imaging. recruited a total 55 people that completed more than 25 per cent project. During classification task, we present participants 1489 images. The sample contains variety data including simulations, real lenses, non-lens examples, and unlabelled data. find experts are extremely good at finding bright, well-resolved Einstein rings, while arcs with...
The Euclid Wide Survey (EWS) is predicted to find approximately 170 000 galaxy-galaxy strong lenses from its lifetime observation of 14 deg^2 the sky. Detecting this many by visual inspection with professional astronomers and citizen scientists alone infeasible. Machine learning algorithms, particularly convolutional neural networks (CNNs), have been used as an automated method detecting lenses, proven fruitful in finding lens candidates. We identify major challenge be automatic detection...
Abstract Current searches for galaxy-scale strong lenses focus on massive Luminous Red Galaxies but tend to overlook late-type lenses, in part because of their smaller Einstein radii. We take advantage the superb seeing UNIONS survey r -band perform an imaging search edge-on lenses. use Convolutional Neural Networks trained with simulated observations composed images real galaxies from and sources HST. Using 3600 square degrees we test ∼7 million find 56 systems obvious signs lensing. In...