S. Andreon
A5028903582- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Remote Sensing in Agriculture
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Impact of Light on Environment and Health
- Gaussian Processes and Bayesian Inference
- Statistical and numerical algorithms
- Advanced Vision and Imaging
- Calibration and Measurement Techniques
- Advanced Statistical Methods and Models
- Radio Astronomy Observations and Technology
- Spectroscopy and Chemometric Analyses
- Pulsars and Gravitational Waves Research
- Particle physics theoretical and experimental studies
Brera Astronomical Observatory
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2023
University of Zurich
2023
École Polytechnique Fédérale de Lausanne
2023
Centre de physique des particules de Marseille
2022
National Institute for Astrophysics
2006-2019
Institute for Space Astrophysics and Planetology
2019
University of Maryland, Baltimore County
2015
University of Bologna
2015
Osservatorio astronomico di Bologna
2015
We present the SEDs of a hard X-ray selected sample containing 136 sources with F2-10 keV > 10-14 erg cm-2 s-1; 132 are AGNs. The detected in 1 deg2 area XMM-Newton Medium Deep Survey where optical data from VVDS and CFHTLS infrared SWIRE survey available. Based on SED fitting technique we derive photometric redshifts σ(1 + z) = 0.11 6% outliers identify AGN signatures 83% objects. This fraction is higher than derived when spectroscopic classification remaining 17% AGNs show star-forming...
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...
In this paper we describe the first data release of Visible and Infrared Survey Telescope for Astronomy (VISTA) Deep Extragalactic Observations (VIDEO) survey. VIDEO is a ~12degree^2 survey in near-infrared Z,Y,J,H K_s bands, specifically designed to enable evolution galaxies large structures be traced as function both epoch environment from present day out z=4, active galactic nuclei (AGN) most massive up into reionization. With its depth area, will able fully explore period Universe where...
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 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 present Hubble Space Telescope imaging and grism spectroscopy in the field of distant galaxy cluster JKCS 041 using Wide Field Camera 3. confirm that is a rich derive redshift z=1.80 via spectroscopic identification 19 member galaxies, which 15 are quiescent. These centered upon diffuse X-ray emission seen by Chandra observatory. As most known with such large, spectroscopically confirmed quiescent population, it provides unique opportunity to study effect environment on properties at...
We present a sample of 29 galaxy clusters from the XMM-LSS survey over an area some 5deg2 out to redshift z=1.05. The clusters, which represent about half X-ray identified in region, follow well defined selection criteria and are all spectroscopically confirmed. For we provide luminosities temperatures as masses. cluster distribution peaks around z=0.3 T =1.5 keV, objects being groups with temperature below 2 keV. Our L-T(z) relation points toward self-similar evolution, but does not exclude...
The analysis of a sample 52 clusters with precise and hypothesis-parsimonious measurements mass, derived from caustics based on about 208 member velocities per cluster average, shows that low-mass groups are not simple scaled-down versions their massive cousins in terms stellar content: lighter have more stars unit mass. same also the content displays an intrinsic spread at given i.e. similar to each other amount they contain, even fixed mass fraction depends halo (logarithmic) slope −0.55 ±...
Galaxy cluster counts in bins of mass and redshift have been shown to be a competitive probe test cosmological models. This method requires an efficient blind detection clusters from surveys with well-known selection function robust estimates. The Euclid wide survey will cover 15000 deg$^2$ the sky optical near-infrared bands, down magnitude 24 $H$-band. resulting data make it possible detect large number galaxy spanning wide-range masses up $\sim 2$. paper presents final results Cluster...
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,...
The XMM Large Scale Structure survey (XMM-LSS) is a medium deep large area X-ray survey. Its goal to extend scale structure investigations attempted using ROSAT cluster samples two redshift bins between 0<z<1 while maintaining the precision of earlier studies. Two main goals have constrained design: evolutionary study cluster–cluster correlation function and number density. adopted observing configuration consists an equatorial mosaic 10 ks pointings, separated by covering 8° × 8°, giving...
We use a sample of 53 galaxy clusters at 0.03 < z 0.1 with available masses derived from the caustic technique and velocity dispersions computed using 208 galaxies on average per cluster, in order to investigate scaling between richness, mass dispersion. A tight richness is found, an intrinsic scatter only 0.19 dex slope one, i.e. which have twice as many are massive. When measured without any knowledge cluster or linked parameters (such r200), it can predict uncertainty 0.29+/-0.01 dex. As...
Using deep two-color near-infrared HST imaging and unbiased grism spectroscopy we present a detailed study of the z=1.803 JKCS041 cluster. Uniquely, for high redshift cluster, confirm mass $\log M=14.2$ in solar units using four different techniques based on X-ray temperature, luminosity cluster richness. is thus progenitor local system like Coma Our rich dataset abundant population 14 spectroscopically-confirmed red sequence galaxies allows us to explore past star formation history this...
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...
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...
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...
We present the morphological analysis based on Hubble Space Telescope HST-NICMOS (Near-Infrared Camera and Multi-Object Spectrometer) observations in F160W filter (λ≃ 1.6 μm) of a sample 32 early-type galaxies (ETGs) at 1 < z 2 with spectroscopic confirmation their redshift spectral type. The ETGs 〈z〉∼ 1.5 are placed (〈μ〉e, Re) plane according to Kormendy relation (KR) same slope local one but different zero-point, which accounts for evolution they undergo from z∼ 1.5–2 z= 0. best fitting...
The metal content of clusters galaxies and its relation to their stellar are revisited making use a cluster sample for which all four basic parameters homogeneously measured within consistent radii, namely core-excised mass-weighted metallicity plus total, intracluster medium (ICM) masses. For total mass M500 ≃ 1014 M⊙, nice agreement is found between iron what expected from empirical supernova yields. the same clusters, there also appears be at least as much in ICM still locked into stars...
An omnipresent feature of the multi-phase ``cosmic web'' is that warm/hot (>$10^5$ K) ionized gas pervades it. This constitutes a relevant contribution to overall universal matter budget across multiple scales, from several tens Mpc-scale IGM filaments, Mpc ICM, all way down CGM surrounding individual galaxies, on scales ~1 kpc up their respective virial radii (~100 kpc). The study hot baryonic component cosmic density represents powerful means for constraining intertwined evolution galactic...
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...