A5035525705- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Advanced Measurement and Metrology Techniques
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Astro and Planetary Science
- Remote Sensing in Agriculture
- Spacecraft Design and Technology
- Impact of Light on Environment and Health
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Statistical and numerical algorithms
- History and Developments in Astronomy
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
Osservatorio Astrofisico di Torino
2010-2025
University College London
2023-2024
University of Copenhagen
2024
Flatiron Health (United States)
2024
Flatiron Institute
2024
Royal Holloway University of London
2024
University of California, Davis
2024
New York University
2024
Princeton University
2024
Marconi University
2024
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...
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,...
This paper presents the specification, design, and development of Visible Camera (VIS) on European Space Agency's mission. VIS is a large optical-band imager with field view 0.54 deg$^2$ sampled at an array 609 Megapixels spatial resolution . It will be used to survey approximately 14 000 extragalactic sky measure distortion galaxies in redshift range $z=0.1$--1.5 resulting from weak gravitational lensing, one two principal cosmology probes leveraged by With photometric redshifts,...
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...
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)...
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...
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...
Context . The future Euclid space satellite mission will offer an invaluable opportunity to constrain modifications Einstein’s general relativity at cosmic scales. In this paper, we focus on modified gravity models characterised, linear scales, by a scale-independent growth of perturbations while featuring different testable types derivative screening mechanisms smaller non-linear Aims We considered three specific models, namely Jordan-Brans-Dicke, scalar-tensor theory with flat potential,...
Context. The Euclid space satellite mission will measure the large-scale clustering of galaxies at an unprecedented precision, providing a unique probe modifications to ΛCDM model. Aims. We investigated approximations needed efficiently predict matter and dark halos in context modified gravity exotic energy scenarios. examined normal branch Dvali–Gabadadze–Porrati model, Hu–Sawicki f ( R ) slowly evolving interacting massive neutrinos. For each, we tested for perturbative kernel...
Euclid is poised to survey galaxies across a cosmological volume of unprecedented size, providing observations more than billion objects distributed over third the full sky. Approximately 20 million these will have their spectroscopy available, allowing us map 3D large-scale structure Universe in great detail. This paper investigates prospects for detection cosmic voids therein and unique benefit they provide cosmology. In particular, we study imprints dynamic geometric distortions average...
The Euclid mission $-$ with its spectroscopic galaxy survey covering a sky area over $15\,000 \ \mathrm{deg}^2$ in the redshift range $0.9<z<1.8\ -$ will provide sample of tens thousands cosmic voids. This paper explores for first time constraining power void size function on properties dark energy (DE) from mock catalogue, official Flagship simulation. We identify voids light-cone, which closely matches features upcoming data set. model considering state-of-the art methodology: we rely...
We investigate the accuracy of perturbative galaxy bias expansion in view forthcoming analysis Euclid spectroscopic samples. compare performance a Eulerian using state-of-the-art prescriptions from effective field theory large-scale structure (EFTofLSS) with hybrid approach based on Lagrangian perturbation and high-resolution simulations. These models are benchmarked against comoving snapshots flagship I N -body simulation at z = (0.9, 1.2, 1.5, 1.8), which have been populated H α galaxies...
The Euclid ERO programme targeted the Perseus cluster of galaxies, gathering deep data in central region over $0.7 deg^2 $, including core up to 0.25,r_200. dataset reaches a point-source depth IE = 28.0 (YE, 25.3), AB magnitudes at $5,σ$ with FWHM mag arcsec for radially integrated galaxy profiles. exceptional and spatial resolution this wide-field multi-band enable simultaneous detection characterisation both bright galaxies low surface brightness ones, along their globular systems, from...
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...
Data from the 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 correct for biases involves calibrating shape measurement methods using image simulations known input shear. Given their high resolution, galaxies observed (HST) can, in principle, utilised emulate observations sheared galaxy images realistic morphologies. In this work, we employ GalSim...
To date, galaxy image simulations for weak lensing surveys usually approximate the light profiles of all galaxies as a single or double Sérsic profile, neglecting influence substructures and morphologies deviating from such simplified parametric characterisation. While this approximation may be sufficient previous data sets, stringent cosmic shear calibration requirements high quality in upcoming survey demand consideration effects that realistic irregular shapes have on measurement biases....