G. Congedo
A5037320979- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Remote Sensing in Agriculture
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Impact of Light on Environment and Health
- Calibration and Measurement Techniques
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Statistical and numerical algorithms
- Advanced Vision and Imaging
- History and Developments in Astronomy
- Spectroscopy and Chemometric Analyses
Royal Observatory
2017-2025
University of Edinburgh
2017-2025
UK Astronomy Technology Centre
2017-2024
École Polytechnique Fédérale de Lausanne
2023
Marconi University
2023
Institut National de Physique Nucléaire et de Physique des Particules
2023
Centre National de la Recherche Scientifique
2023
Lyon College
2023
Université Claude Bernard Lyon 1
2023
GlobalFoundries (Germany)
2020
We report the first results of LISA Pathfinder in-flight experiment. The demonstrate that two free-falling reference test masses, such as those needed for a space-based gravitational wave observatory like LISA, can be put in free fall with relative acceleration noise square root power spectral density 5.2±0.1 fm s^{-2}/sqrt[Hz], or (0.54±0.01)×10^{-15} g/sqrt[Hz], g standard gravity, frequencies between 0.7 and 20 mHz. This value is lower than requirement by more factor 5 within 1.25...
The Euclid space telescope will measure the shapes and redshifts of galaxies to reconstruct expansion history Universe growth cosmic structures. Estimation expected performance experiment, in terms predicted constraints on cosmological parameters, has so far relied different methodologies numerical implementations, developed for observational probes their combination. In this paper we present validated forecasts, that combine both theoretical expertise probes. This is presented provide...
Euclid is an ESA mission designed to constrain the properties of dark energy and gravity via weak gravitational lensing galaxy clustering. It will carry out a wide area imaging spectroscopy survey (EWS) in visible near-infrared, covering roughly 15,000 square degrees extragalactic sky on six years. The wide-field telescope instruments are optimized for pristine PSF reduced straylight, producing very crisp images. This paper presents building reference survey: sequence pointings EWS, Deep...
We present a new, updated version of the EuclidEmulator (called EuclidEmulator2), fast and accurate predictor for nonlinear correction matter power spectrum. Percent-level emulation is now supported in eight-dimensional parameter space $w_0w_a$CDM$+\sum m_\nu$models between redshift $z=0$ $z=3$ spatial scales within range 0.01 $h$/Mpc $\leq k \leq$ 10 $h$/Mpc. In order to achieve this level accuracy, we have had improve quality underlying N-body simulations used as training data: (1) use...
The Euclid ERO showcase Euclid's capabilities in advance of its main mission by targeting 17 astronomical objects, including galaxy clusters, nearby galaxies, globular and star-forming regions. A total 24 hours observing time was allocated the early months operation, scientific community engaged through an public data release. We describe development pipeline to create visually compelling images while simultaneously meeting demands within launch leveraging a pragmatic data-driven strategy....
The last century has seen enormous progress in our understanding of the Universe. We know life cycles stars, structure galaxies, remnants big bang, and have a general how Universe evolved. come remarkably far using electromagnetic radiation as tool for observing However, gravity is engine behind many processes Universe, much its action dark. Opening gravitational window on will let us go further than any alternative. Gravity own messenger: Gravitational waves, ripples fabric spacetime. They...
Euclid will be the first space mission to survey most of extragalactic sky in 0.95-2.02 $\mu$m range, a 5$\sigma$ point-source median depth 24.4 AB mag. This unique photometric data set find wide use beyond Euclid's core science. In this paper, we present accurate computations Y_E, J_E and H_E passbands used by Near-Infrared Spectrometer Photometer (NISP), associated system. We pay particular attention passband variations field view, accounting among others for spatially variable filter...
We investigate the importance of lensing magnification for estimates galaxy clustering and its cross-correlation with shear photometric sample Euclid. Using updated specifications, we study impact on constraints shift in estimation best fitting cosmological parameters that expect if this effect is neglected. follow prescriptions official Euclid Fisher matrix forecast analysis combination cosmic shear. The slope luminosity function (local count slope), which regulates amplitude magnification,...
Recent cosmic shear studies have shown that higher-order statistics (HOS) developed by independent teams now outperform standard two-point estimators in terms of statistical precision thanks to their sensitivity the non-Gaussian features large-scale structure. The aim Higher-Order Weak Lensing Statistics (HOWLS) project is assess, compare, and combine constraining power ten different HOS on a common set $Euclid$-like mocks, derived from N-body simulations. In this first paper HOWLS series,...
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...
In this paper, we describe the current status of LISA Pathfinder mission, a precursor mission aimed at demonstrating key technologies for future spacebased gravitational wave detectors, like LISA.Since much flight hardware has already been constructed and tested, will show that performance measurements analysis these components lead to an expected which is significant improvement over requirements, actually reaches requirements entire measurement band.
This paper presents a quantitative assessment of the performance upcoming LISA Pathfinder geodesic explorer mission. The findings are based on results extensive ground testing and simulation campaigns using flight hardware, control operations algorithms. show that, for central experiment measuring stray differential acceleration between test masses, will be able to verify overall noise within factor 2 requirement at 1 mHz 6 0.1 mHz. We also discuss key elements physical model disturbances,...
Forthcoming large photometric surveys for cosmology require precise and accurate redshift (photo- z ) measurements the success of their main science objectives. However, to date, no method has been able produce photo- s at required accuracy using only broad-band photometry that those will provide. An assessment strengths weaknesses current methods is a crucial step in eventual development an approach meet this challenge. We report on performance 13 code single value estimates probability...
We provide predictions of the yield $7<z<9$ quasars from Euclid wide survey, updating calculation presented in Red Book several ways. account for revisions to near-infrared filter wavelengths; we adopt steeper rates decline quasar luminosity function (QLF; $\Phi$) with redshift, $\Phi\propto10^{k(z-6)}$, $k=-0.72$, and a further rate decline, $k=-0.92$; use better models contaminating populations (MLT dwarfs compact early-type galaxies); an improved Bayesian selection method, compared colour...
The combination and cross-correlation of the upcoming $Euclid$ data with cosmic microwave background (CMB) measurements is a source great expectation since it will provide largest lever arm epochs, ranging from recombination to structure formation across entire past light cone. In this work, we present forecasts for joint analysis CMB on cosmological parameters standard model some its extensions. This work expands complements recently published based $Euclid$-specific probes, namely galaxy...
We present a new infrared survey covering the three Euclid deep fields and four other calibration using Spitzer's Infrared Array Camera (IRAC). have combined these observations with all relevant IRAC archival data of in order to produce deepest possible mosaics regions. In total, represent nearly 11% total Spitzer mission time. The resulting cover approximately 71.5deg$^2$ 3.6 4.5um bands, 21.8deg$^2$ 5.8 8um bands. They reach at least 24 AB magnitude (measured sigma, 2.5 arcsec aperture)...
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate universe, and understand stochastic gravitational-wave backgrounds their implications for early universe particle physics, from MeV Planck scale. However, range potential applications gravitational wave observations extends well beyond these objectives. This publication presents a summary state art in LISA cosmology, theory methods, identifies new opportunities use...
We present a tomographic weak lensing analysis of the Kilo Degree Survey Data Release 4 (KiDS-1000), using new pseudo angular power spectrum estimator (pseudo- C ℓ ) under development for ESA Euclid mission. Over 21 million galaxies with shape information are divided into five redshift bins, ranging from 0.1 to 1.2 in photometric redshift. measured pseudo- eight bands multipole range 76 < 1500 auto- and cross-power spectra between bins. A series tests were carried out check systematic...
Abstract The measurement of the absolute neutrino mass scale from cosmological large-scale clustering data is one key science goals Euclid mission. Such a relies on precise modelling impact neutrinos structure formation, which can be studied with N -body simulations. Here we present results major code comparison effort to establish maturity and reliability numerical methods for treating massive neutrinos. includes eleven full implementations (not all them independent), two schemes...
Euclid's photometric galaxy cluster survey has the potential to be a very competitive cosmological probe. The main probe with observations of clusters is their number count, within which halo mass function (HMF) key theoretical quantity. We present new calibration analytic HMF, at level accuracy and precision required for uncertainty in this quantity subdominant respect other sources recovering parameters from Euclid counts. Our model calibrated against suite N-body simulations using...
Primordial features, in particular oscillatory signals, imprinted the primordial power spectrum of density perturbations represent a clear window opportunity for detecting new physics at high-energy scales. Future spectroscopic and photometric measurements from $Euclid$ space mission will provide unique constraints on spectrum, thanks to redshift coverage high-accuracy measurement nonlinear scales, thus allowing us investigate deviations standard power-law spectrum. We consider two models...
Aims. We validate a semi-analytical model for the covariance of real-space two-point correlation function galaxy clusters. Methods. Using 1000 PINOCCHIO light cones mimicking expected Euclid sample clusters, we calibrated simple to accurately describe clustering covariance. Then, used this quantify likelihood-analysis response variations in covariance, and investigated impact cosmology-dependent matrix at level statistics survey Results. find that Gaussian with Poissonian shot-noise does not...
LISA Pathfinder, the second of European Space Agency's Small Missions for Advanced Research in Technology (SMART), is a dedicated technology demonstrator joint ESA/NASA Laser Interferometer Antenna (LISA) mission. The technologies required are many and extremely challenging. This coupled with fact that some flight hardware cannot be fully tested on ground due to Earth-induced noise led implementation Pathfinder mission test critical environment. essentially mimics one arm constellation by...