A5053735926- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Advanced Data Storage Technologies
- Distributed and Parallel Computing Systems
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Parallel Computing and Optimization Techniques
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Scientific Computing and Data Management
- Computational Physics and Python Applications
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Lattice Boltzmann Simulation Studies
- Scientific Research and Discoveries
- Black Holes and Theoretical Physics
- Relativity and Gravitational Theory
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Simulation Techniques and Applications
- Astro and Planetary Science
- Quantum, superfluid, helium dynamics
- Algorithms and Data Compression
University of Bologna
2021-2024
Institute for Fundamental Physics of the Universe
2020-2024
Osservatorio di Astrofisica e Scienza dello Spazio
2023-2024
Trieste Astronomical Observatory
2019-2024
Ludwig-Maximilians-Universität München
2016-2020
Leibniz Supercomputing Centre
2017-2020
Excellence Cluster Universe
2017-2020
National Institute for Astrophysics
2020
ABSTRACT Dark matter self-interactions may have the capability to solve or at least mitigate small-scale problems of cosmological standard model, Lambda cold dark matter. There are a variety self-interacting models that lead distinguishable astrophysical predictions and hence varying success in explaining observations. Studies (DM) density cores on various mass scales suggest velocity-dependent scattering cross-section. In this work, we investigate how velocity dependence alters evolution DM...
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...
Context. Previous studies have revealed that the estimated probability of galaxy-galaxy strong lensing in observed galaxy clusters exceeds expectations from Λ cold dark matter cosmological model by one order magnitude. Aims. We aim to understand origin this excess analyzing a larger set simulated clusters, and investigating how theoretical vary under different adopted prescriptions numerical implementations star formation feedback simulations. Methods. performed ray-tracing analysis 324 T...
This work aims at assessing the impact of DM self-interactions on properties galaxy clusters. In particular, goal is to study angular dependence cross section by testing rare (large angle scattering) and frequent (small SIDM models with velocity-dependent sections. We re-simulate six cluster zoom-in initial conditions a dark matter only run full-physics setup simulations that includes self-consistent treatment baryon physics. test full physics either collisionless cold matter,...
We study the dependency of concentration on mass and redshift using three large N-body cosmological hydrodynamic simulations carried out by Magneticum project. constrain slope mass-concentration relation with an unprecedented range for find a negative trend plane slightly dependency, in agreement observations other numerical works. also show how correlates fossil parameter, defined as stellar ratio between central galaxy most massive satellite, observations. that haloes high parameter have...
Aims. We studied the star formation rate (SFR) in cosmological hydrodynamical simulations of galaxy (proto-)clusters redshift range 0 < z 4, comparing them to recent observational studies; we also investigated effect varying parameters model on properties such as SFR, star-formation efficiency, and gas fraction. Methods. analyse a set zoom-in centred 12 clusters. The are carried out with GADGET-3 Tree-PM smoothed-particle hydro-dynamics code which includes various subgrid models treat...
Meneghetti et al. (2020) recently reported an excess of galaxy-galaxy strong lensing (GGSL) in galaxy clusters compared to expectations from the LCDM cosmological model. Theoretical estimates GGSL probability are based on analysis numerical hydrodynamical simulations cosmology. We quantify impact resolution and AGN feedback scheme adopted predicted determine if varying these simulation properties can alleviate gap with observations. repeat cluster-size halos simulated different mass force...
Cluster cosmology can benefit from combining multi-wavelength studies. In turn, these studies a characterisation of the correlation coefficients among different mass-observable relations. this work, we aim to provide information on scatter, skewness, and covariance various relations in galaxy clusters cosmological hydrodynamic simulations. This will help future analyses improve general approach accretion histories projection effects, as well model for We identified Magneticum Box2b...
We employ a set of Magneticum cosmological hydrodynamic simulations that span over $15$ different cosmologies, and extract masses concentrations all well-resolved haloes between $z=0-1$ for critical over-densities $\Delta_\texttt{vir}, \Delta_{200c}, \Delta_{500c}, \Delta_{2500c}$ mean overdensity $\Delta_{200m}.$ provide the first mass-concentration (Mc) relation sparsity (i.e. $M_{\Delta1} - M_{\Delta2}$ mass conversion) is modelled by mass, redshift parameters $\Omega_m, \Omega_b,...
Dark matter (DM) with self-interactions is a promising solution for the small-scale problems of standard cosmological model. Here we perform first simulation frequent DM self-interactions, corresponding to small-angle scatterings. The focus our analysis lies in finding and understanding differences traditionally assumed rare (large-angle) self For this purpose, compute distribution densities, power spectrum, two-point correlation function halo subhalo mass functions. Furthermore, investigate...
We study the redshift evolution of baryon budget in a large set galaxy clusters from {\it Magneticum} suite SPH cosmological simulations. At high redshifts, we obtain "closed box" systems independently by mass on radii greater than $3R_{500,\mathrm c}$, whereas at lower only most massive halos could be considered as `"closed box". The fraction shows general decrease with and, for less objects, observe much more prominent halos. gas depletion parameter $Y_{\rm gas}$ steeper and highly...
Self-interacting dark matter (SIDM) models have the potential to solve small-scale problems that arise in cold paradigm. Simulations are a powerful tool for studying SIDM context of astrophysics, but it is numerically challenging study differential cross-sections favour small-angle scattering, as light-mediator models. Here, we present novel approach model frequent scattering based on an effective drag force, which implemented into N-body code gadget-3. In range test problems, demonstrate...
We study the distributions of baryons in massive halos ($M_{vir} > 10^{13} \ h^{-1}M_{\odot}$) $Magneticum$ suite Smoothed Particle Hydrodynamical cosmological simulations, out to unprecedented radial extent $10 R_{500,\mathrm c}$. confirm that, under action non-gravitational physical phenomena, baryon mass fraction is lower inner regions ($<R_{500,\mathrm c}$) increasingly less halos, and rises moving outwards, with values that spans from 51% (87%) around $R_{500,\mathrm c}$ 95% (100%) at...
We measure and quantify properties of galactic outflows diffuse gas at $z \geq 1$ in cosmological hydrodynamical simulations. Our novel sub-resolution model, MUPPI, implements supernova feedback using fully local properties, where the wind velocity mass loading are not given as input. find following trends = 2$ by analysing central galaxies having a stellar higher than $10^{9} M_{\odot}$. The outflow rate ($\dot{M}_{\rm out}$) exhibit positive correlations with galaxy star formation (SFR)....
In this paper, we assess the impact of numerical resolution and implementation energy input from AGN feedback models on inner structure cluster sub-haloes in hydrodynamic simulations. We compare several zoom-in re-simulations a sub-sample cluster-sized haloes studied Meneghetti et al. (2020), obtained by varying mass resolution, softening length scheme. study these different setups subhalo abundances, their radial distribution, density profiles relation between maximum circular velocity,...
ABSTRACT Galaxy cluster masses derived from observations of weak lensing suffer a number biases affecting the accuracy mass-observable relations calibrated such observations. In particular, choice centre plays prominent role in biasing inferred masses. past, empirical miscentring distributions have been used to address this issue. Using hydrodynamic simulations, we aim test mass bias predictions based on by comparing results computed directly using intracluster medium (ICM)-based centres...
We introduce a novel sub-resolution prescription to correct for the unresolved dynamical friction (DF) onto black holes (BHs) in cosmological simulations, describe BH dynamics accurately, and overcome spurious motions induced by numerical effects. implemented DF BHs code. carried out simulations of volume $(16 \ comoving Mpc )^3$ zoomed-in galaxy group cluster. assessed advantages our new technique comparison commonly adopted methods hampering displacements, namely repositioning local...
ABSTRACT We present resolved thermodynamic profiles out to 500 kpc, about r500, of the z = 1.75 galaxy cluster IDCS J1426.5+3508 with 40 kpc resolution. Thanks combination Sunyaev–Zel’dovich and X-ray data sets, becomes most distant profiles. These are derived assuming a non-parametric pressure profile very flexible model for electron density profile. The shape is flatter than universal temperature increasing radially kpc. To identify possible future evolution , we compared it its local...
Dark matter (DM) self-interactions have been proposed to solve problems on small length scales within the standard cold DM cosmology. Here, we investigate effects of in merging systems galaxies and galaxy clusters with equal unequal mass ratios. We perform N-body DM-only simulations idealized setups study that are elastic velocity-independent. go beyond commonly adopted assumption large-angle (rare) scatterings, paying attention impact small-angle (frequent) scatterings astrophysical...
INAF Trieste Astronomical Observatory (OATs) has a long tradition in information technology applied to and Astrophysical use cases, particularly for what regards computing data reduction, analysis simulations; archives management; space missions processing; design software development ground-based instruments. The ensemble of these activities, the last years, pushed need acquire new resources technologies deep competences theirs management. In this paper we describe INAF-OATs centre...
Context. Several recent studies have highlighted a discrepancy between the strong lensing (SL) properties of observed cluster galaxies and predictions Λ cold dark matter (CDM) cosmological hydrodynamical simulations. This can be interpreted as result members being more compact than their simulated counterparts. Aims. In this work, we aim at direct measurement compactness few selected galaxy-scale lenses in massive clusters, testing accuracy scaling laws adopted to describe SL models galaxy...
ABSTRACT In this study, we investigate a recent finding based on strong lensing observations, which suggests that the sub-haloes observed in clusters exhibit greater compactness compared to those predicted by ΛCDM simulations. To address discrepancy, compare cumulative sub-halo mass function and Msub–Vcirc relation between 324 simulated from $\rm \small {The\,Three\,\,Hundred}$ project, focusing hydrodynamic resimulations using {Gadget-X}$ {Gizmo-Simba}$ baryonic models. The of aligns with...
The Euclid photometric survey of galaxy clusters stands as a powerful cosmological tool, with the capacity to significantly propel our understanding Universe. Despite being subdominant dark matter and energy, baryonic component Universe holds substantial influence over structure mass clusters. This paper presents novel model that can be used precisely quantify impact baryons on virial halo masses using baryon fraction within cluster proxy for their effect. Constructed premise...
The reservoir of molecular gas (H$_{\rm 2}$) represents the fuel for star formation (SF) a galaxy. Connecting rate (SFR) to available H$_{\rm 2}$ is key accurately model SF in cosmological simulations galaxy formation. We investigate how modifying underlying modelling and description stellar feedback low-metallicity environments (LMF, i.e. feedback) cosmological, zoomed-in Milky Way-size halo influences history forming, spiral its final properties. exploit two different models compute...