M. Roncarelli
A5049045872- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Remote Sensing in Agriculture
- Calibration and Measurement Techniques
- Radio Astronomy Observations and Technology
- Impact of Light on Environment and Health
- Dark Matter and Cosmic Phenomena
- Statistical and numerical algorithms
- Astro and Planetary Science
- Particle Detector Development and Performance
- History and Developments in Astronomy
- Advanced Vision and Imaging
- CCD and CMOS Imaging Sensors
- Superconducting and THz Device Technology
- Solar and Space Plasma Dynamics
- Gaussian Processes and Bayesian Inference
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2025
Marconi University
2023-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2023
University of Zurich
2023
École Polytechnique Fédérale de Lausanne
2023
Institut National de Physique Nucléaire et de Physique des Particules
2023
Centre National de la Recherche Scientifique
2009-2023
Lyon College
2023
Université Claude Bernard Lyon 1
2023
University of Bologna
2013-2022
The hot plasma in galaxy clusters is expected to be heated high temperatures through shocks and adiabatic compression. thermodynamical properties of the gas encode information on processes leading thermalization cluster's potential well as non-gravitational such cooling, AGN feedback kinetic energy. In this work we present radial profiles thermodynamic intracluster medium (ICM) out virial radius for a sample 12 selected from Planck all-sky survey. We determine universal density, temperature,...
We present the analysis of a local (z = 0.04 - 0.2) sample 31 galaxy clusters with aim measuring density X-ray emitting gas in cluster outskirts. compare our results numerical simulations to set constraints on azimuthal symmetry and clumping outer regions clusters. exploit large field-of-view low instrumental background ROSAT/PSPC trace intracluster out virial radius. perform stacking profiles detect signal beyond r200 measure typical scatter also compute respect mean value look for...
Aims. We present a cosmological analysis of abundances and stacked weak lensing profiles galaxy clusters, exploiting the AMICO KiDS-DR3 catalogue. The sample consists 3652 clusters with intrinsic richness λ * ≥ 20, over an effective area 377 deg 2 , in redshift range z ∈ [0.1, 0.6]. Methods. quantified purity completeness through simulations. statistical has been performed by simultaneously modelling co-moving number density scaling relation between richnesses cluster masses, assessed...
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,...
The reconstruction of galaxy cluster's gas density profiles is usually performed by assuming spherical symmetry and averaging the observed X-ray emission in circular annuli. In case a very inhomogeneous asymmetric distribution, this method has been shown to return biased results numerical simulations because n2 dependence emissivity. We propose recover true presence inhomogeneities, based on derivation azimuthal median surface brightness concentric demonstrate performance with simulations,...
Using a set of hydrodynamical simulations 62 galaxy clusters and groups we study the ICM inhomogeneities, focusing on ones large scale that, unlike clumps, are most difficult to identify. To this purpose introduce concept residual clumpiness, C_R, that quantifies large-scale inhomogeneity ICM. After showing quantity can be robustly defined for relaxed systems, characterize how it varies with radius, mass dynamical state halo. Most importantly, observe introduces an overestimate in...
We present the mass calibration for galaxy clusters detected with AMICO code in KiDS DR3 data. The cluster sample comprises $\sim$ 7000 objects and covers redshift range 0.1 < $z$ 0.6. perform a weak lensing stacked analysis by binning according to two different proxies provided AMICO, namely amplitude $A$ (measure of abundance through an optimal filter) richness $\lambda^*$ (sum membership probabilities consistent radial magnitude across redshift). For each bin, we model data as truncated...
Galaxy clusters are the endpoints of structure formation and continuously growing through merging accretion smaller structures. Numerical simulations predict that a fraction their energy content is not yet thermalized, mainly in form kinetic motions (turbulence, bulk motions). Measuring level non-thermal pressure support necessary to understand processes leading virialization gas within potential well main halo calibrate biases hydrostatic mass estimates. We present high-quality measurements...
We present the first catalogue of galaxy cluster candidates derived from third data release Kilo Degree Survey (KiDS-DR3). The sample clusters has been produced using Adaptive Matched Identifier Clustered Objects (AMICO) algorithm. In this analysis AMICO takes advantage luminosity and spatial distribution galaxies only, not considering colours. way, we prevent any selection effect related to presence or absence red-sequence in clusters. contains 7988 candidate redshift range 0.1<z<0.8 down...
We present the reconstruction of hydrostatic mass profiles in 13 X-ray luminous galaxy clusters that have been mapped their and SZ signal out to $R_{200}$ for XMM-Newton Cluster Outskirts Project (X-COP). Using gas temperature, density pressure spatially resolved (median value) 0.9 $R_{500}$, 1.8 2.3 respectively, we are able recover gravitating profile with several methods using different models. The masses recovered a relative (statistical) median error 3% at $R_{500}$ 6% $R_{200}$. By...
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...
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...
Using a set of hydrodynamical simulations nine galaxy clusters with masses in the range 1.5 × 1014 < Mvir 3.4 1015 M⊙, we have studied density, temperature and X-ray surface brightness profiles intracluster medium regions around virial radius. We analysed radial well above cluster core, physics which are still unclear matter tension between simulated observed properties, up to radius beyond, where present observations unable provide any constraints. modelled 0.3R200 3R200 power laws one...
Context. Galaxy clusters are continuously growing through the accretion of matter in their outskirts. This process induces inhomogeneities gas density distribution (clumping) which need to be taken into account recover physical properties intracluster medium (ICM) at large radii. Aims. We studied thermodynamic outskirts (R > R500) massive galaxy cluster Abell 2142 by combining Sunyaev Zel'dovich (SZ) effect with X-ray signal. Methods. combined SZ pressure profile measured Planck XMM-Newton...
We present Adaptive Matched Identifier of Clustered Objects (AMICO), a new algorithm for the detection galaxy clusters in photometric surveys. AMICO is based on Optimal Filtering technique, which allows to maximize signal-to-noise ratio (S/N) clusters. In this work, we focus iterative approach extraction cluster candidates from map produced by filter. particular, provide definition membership probability galaxies close any candidate, us remove its imprint map, allowing smaller structures. As...
Aims. We analysed the clustering of a photometric sample galaxy clusters selected from Third Data Release Kilo-Degree Survey, focusing on redshift-space two-point correlation function (2PCF). compared our measurements to theoretical predictions standard Λ cold dark matter (ΛCDM) cosmological model. Methods. measured 2PCF in cluster-centric radial range r ∈ [5, 80] h −1 Mpc, considering 4934 with richness λ * ≥ 15 redshift z [0.1, 0.6]. A Markov chain Monte Carlo analysis has been performed...
We use high-resolution hydrodynamical simulations of large-scale structure formation to study the imprints local superclusters onto full-sky Sunyaev-Zel'dovich (SZ) signals. Following (Mathis et al. 2002), initial conditions have been statistically constrained reproduce density field within a sphere 110 Mpc around Milky Way, as observed in IRAS 1.2-Jy all-sky redshift survey. As result, positions and masses prominent galaxy clusters our coincide closely with their real counterparts universe....
In this paper we investigate the power spectrum of unresolved 0.5–2 keV cosmic X-ray background (CXB) with deep Chandra 4-Msec (Ms) observations in Deep Field South (CDFS). We measured a signal that, on scales >30 arcsec, is significantly higher than shot noise and increasing angular scale. interpreted as joint contribution clustered undetected sources like active galactic nuclei (AGN), galaxies intergalactic medium (IGM). The source fluctuations accounts for ∼12 per cent extragalactic CXB....
Detecting the thermal and non-thermal emission from shocked cosmic gas surrounding large-scale structures represents a challenge for observations, as well unique window into physics of warm-hot intergalactic medium. In this work, we present synthetic radio X-ray surveys large cosmological simulations in order to assess chances jointly detecting web both frequency ranges. We then propose best observing strategies tailored existing (LOFAR, MWA XMM) or future instruments (SKA-LOW SKA-MID,...
Answers to the metal production of Universe can be found in galaxy clusters, notably within their intra-cluster medium (ICM). The X-ray Integral Field Unit (X-IFU) on board next-generation European observatory Athena (2030s) will provide necessary leap forward spatially-resolved spectroscopy required disentangle intricate mechanisms responsible for this chemical enrichment. In paper, we investigate future capabilities X-IFU probing hot gas clusters. From a test sample four clusters extracted...
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...
Context. Weak gravitational lensing offers a powerful method to investigate the projected matter density distribution within galaxy clusters, granting crucial insights into broader landscape of dark on cluster scales. Aims. In this study, we make use large photometric data set derived from publicly available Third Data Release Kilo-Degree Survey, along with associated shear signal. Our primary objective is model peculiar sharp transition in profile slope, that what commonly referred as...
Massive neutrinos are expected to influence the formation of large-scale structure Universe, depending on value their total mass, Σ mν. In particular Planck data indicate that a non-zero mν may help reconcile cosmic microwave background with Sunyaev–Zel'dovich (SZ) cluster surveys. order study impact SZ and X-ray properties we run set six very large cosmological simulations (8 h−3 Gpc3 comoving volume) include massive neutrino particle component: consider values = (0, 0.17, 0.34) eV in two...