A5058095222- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Advanced optical system design
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Spacecraft Design and Technology
- Astrophysics and Star Formation Studies
- Remote Sensing in Agriculture
- Planetary Science and Exploration
- Scientific Research and Discoveries
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
- Impact of Light on Environment and Health
- History and Developments in Astronomy
Osservatorio Astrofisico di Torino
2015-2025
Université Paris-Saclay
2024
University College London
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
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...
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 Near-Infrared Spectrometer and Photometer (NISP) on board the Euclid satellite provides multiband photometry R>=450 slitless grism spectroscopy in 950-2020nm wavelength range. In this reference article we illuminate background of NISP's functional calibration requirements, describe instrument's integral components, provide all its key properties. We also sketch processes needed to understand how NISP operates is calibrated, technical potentials limitations. Links articles providing more...
We present the first long baseline mid-infrared interferometric observations of circumstellar disks surrounding Herbig Ae/Be stars. The were obtained using instrument MIDI at European Southern Observatory (ESO) Very Large Telescope Interferometer VLTI on Cerro Paranal. 102 m given by telescopes UT1 and UT3 was employed, which provides a maximum full spatial resolution 20 milli-arcsec (mas) wavelength 10 μm. signal spectrally dispersed 30, giving resolved visibility information from 8 μm to...
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,...
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...
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,...
In modern weak-lensing surveys, the common approach to correct for residual systematic biases in shear is calibrate shape measurement algorithms using simulations. These simulations must fully capture complexity of observations avoid introducing any additional bias. this paper we study importance faint galaxies below observational detection limit a survey. We simulate simplified Euclid VIS images including and excluding population, measure shift multiplicative bias between two sets with...
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...
This work considers which higher order modeling effects on the cosmic shear angular power spectra must be taken into account for Euclid . We identified relevant terms and quantified their individual cumulative impact cosmological parameter inferences from computed values of these using analytic expressions calculated estimations Fisher matrix formalism. reviewed 24 determined ones that potentially need to accounted for, namely: reduced approximation, magnification bias, source-lens...
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...
While Euclid is an ESA mission specifically designed to investigate the nature of Dark Energy and Matter, planned unprecedented combination survey area ($\sim15\,000$ deg$^2$), spatial resolution, low sky-background, depth also make excellent space observatory for study surface brightness Universe. Scientific exploitation extended structures requires dedicated calibration procedures yet be tested. We capabilities detect structure by identifying quantifying sky background sources stray-light...
ABSTRACT Next-generation telescopes, like Euclid, Rubin/LSST, and Roman, will open new windows on the Universe, allowing us to infer physical properties for tens of millions galaxies. Machine-learning methods are increasingly becoming most efficient tools handle this enormous amount data, because they often faster more accurate than traditional methods. We investigate how well redshifts, stellar masses, star-formation rates (SFRs) can be measured with deep-learning algorithms observed...
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...