A. Biviano
A5040823728- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Remote Sensing in Agriculture
- CCD and CMOS Imaging Sensors
- Spectroscopy and Laser Applications
- Impact of Light on Environment and Health
- Statistical and numerical algorithms
- Radio Astronomy Observations and Technology
- Atmospheric Ozone and Climate
- Advanced Vision and Imaging
- Astro and Planetary Science
- Spectroscopy and Chemometric Analyses
- Particle physics theoretical and experimental studies
Trieste Astronomical Observatory
2016-2025
Institute for Fundamental Physics of the Universe
2019-2025
Marconi University
2024
École Polytechnique Fédérale de Lausanne
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2023
RWTH Aachen University
2023
Centre National de la Recherche Scientifique
1994-2022
Institut d'Astrophysique de Paris
1994-2022
Sorbonne Université
2013-2022
National Institute for Astrophysics
2003-2020
Euclid is a space-based survey mission from the European Space Agency designed to understand origin of Universe's accelerating expansion. It will use cosmological probes investigate nature dark energy, matter and gravity by tracking their observational signatures on geometry universe cosmic history structure formation. The optimised for two independent primary probes: Weak gravitational Lensing (WL) Baryonic Acoustic Oscillations (BAO). payload consists 1.2 m Korsch telescope provide large...
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...
Abstract GAs Stripping Phenomena in galaxies with MUSE (GASP) is a new integral-field spectroscopic survey at the VLT aimed studying gas removal processes galaxies. We present an overview of and show first example galaxy undergoing strong stripping. GASP obtaining deep data for 114 z = 0.04–0.07 stellar masses range <?CDATA ${10}^{9.2}\mbox{--}{10}^{11.5}\,{M}_{\odot }$?> different environments (galaxy clusters groups over more than four orders magnitude halo mass). targets optical...
We present a joint shear-and-magnification weak-lensing analysis of sample 16 X-ray-regular and 4 high-magnification galaxy clusters at 0.19 ≲ z 0.69 selected from the Cluster Lensing And Supernova survey with Hubble (CLASH). Our uses wide-field multi-color imaging, taken primarily Suprime-Cam on Subaru Telescope. From stacked-shear-only X-ray-selected subsample, we detect ensemble-averaged lensing signal total signal-to-noise ratio ≃ 25 in radial range 200–3500 kpc h−1, providing integrated...
We present an analysis of the relation between masses cluster- and group-sized haloes, extracted from Λ cold dark matter (ΛCDM) cosmological N-body hydrodynamic simulations, their velocity dispersion at different redshifts z = 2 to 0. The main aim this is understand how implementation baryonic physics in simulations affects such relations, i.e. what extent use as a proxy for cluster mass determination hampered by imperfect knowledge physics. In our analysis, we several sets with implemented:...
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...
We study the efficiency and reliability of cluster mass estimators that are based on projected phase-space distribution galaxies in a region. To this aim, we analyse data-set 62 clusters extracted from concordance LCDM cosmological hydrodynamical simulation. Galaxies (or Dark Matter particles) first selected cylinders given radius (from 0.5 to 1.5 Mpc/h) ~200 Mpc/h length. Cluster members then identified by applying suitable interloper removal algorithm. Two considered: virial estimator...
Mass modelling of spherical systems through internal motions is hampered by the mass/velocity anisotropy (VA) degeneracy inherent in Jeans equation, as well lack techniques that are both fast and adaptable to realistic systems. A new method, called MAMPOSSt, which performs a maximum likelihood fit distribution observed tracers projected phase space, developed thoroughly tested. MAMPOSSt assumes shape for gravitational potential, but instead postulating function terms energy angular momentum,...
We present a new determination of the concentration–mass (c–M) relation for galaxy clusters based on our comprehensive lensing analysis 19 X-ray selected from Cluster Lensing and Supernova Survey with Hubble (CLASH). Our sample spans redshift range between 0.19 0.89. combine weak-lensing constraints Space Telescope (HST) ground-based wide-field data strong HST. The results are reconstructions surface-mass density all CLASH multi-scale grids. derivation Navarro–Frenk–White parameters yields...
We study the characteristics of galaxy cluster samples expected from European Space Agency's Euclid satellite and forecast constraints on cosmological parameters describing a variety models. The method used in this paper, based Fisher Matrix approach, is same one to provide presented Red Book (Laureijs et al.2011). describe analytical approach compute selection function photometric spectroscopic surveys. Based function, we number parameter sets corresponding different extensions standard...
We present results from a comprehensive lensing analysis in Hubble Space Telescope (HST) data of the complete Cluster Lensing And Supernova survey with cluster sample. identify previously undiscovered multiple images, allowing improved or first constraints on inner mass distributions and profiles. combine these strong weak shape measurements within HST field view (FOV) to jointly constrain distributions. The is performed two different common parameterizations (one adopts light-traces-mass...
<i>Aims. <i/>We present the results from a comprehensive spectroscopic survey of WINGS (WIde-field Nearby Galaxy-cluster Survey) clusters, program called WINGS-SPE. The WINGS-SPE sample consists 48 22 which are in southern sky and 26 north. main goals this are: (1) to study dynamics kinematics clusters their constituent galaxies, (2) explore link between spectral properties morphological evolution different density environments across wide range cluster X-ray luminosities optical...
It is well known that galaxies falling into clusters can experience gas stripping due to ram-pressure by the intra-cluster medium (ICM). The most spectacular examples are with extended tails of optically-bright stripped material as "jellyfish". We use first large homogeneous compilation jellyfish in from WINGS and OmegaWINGS surveys, follow-up MUSE observations GASP programme investigate orbital histories reconstruct their history through position vs. velocity phase- space diagrams....
We present an analysis of the MUSIC-2 N-body/hydrodynamical simulations aimed at estimating expected concentration–mass relation for CLASH (Cluster Lensing and Supernova Survey with Hubble) cluster sample. study nearly 1,400 halos simulated high spatial mass resolution. shape both their density surface-density profiles fit them a variety radial functions, including Navarro–Frenk–White (NFW), generalized NFW, Einasto profiles. derive concentrations masses from these fits. produce Chandra...
We use an unprecedented data-set of about 600 redshifts for cluster members, obtained as part a VLT/VIMOS large programme, to constrain the mass profile z=0.44 MACS J1206.2-0847 over radial range 0-5 Mpc (0-2.5 virial radii) using MAMPOSSt and Caustic methods. then add external constraints from our previous gravitational lensing analysis. invert Jeans equation obtain velocity-anisotropy profiles members. With mass-density we first determination pseudo-phase-space density profile. The...
We report the spectroscopic confirmation of 22 new multiply lensed sources behind Hubble Frontier Field (HFF) galaxy cluster MACS~J0416.1$-$2403 (MACS 0416), using archival data from Multi Unit Spectroscopic Explorer (MUSE) on VLT. Combining with previous measurements 15 other imaged sources, we obtain a sample 102 secure multiple images measured redshifts, largest to date in single strong lensing system. The newly confirmed are largely low-luminosity Lyman-$\alpha$ emitters redshift range...
We perform a comprehensive study of the total mass distribution galaxy cluster RXCJ2248 ($z=0.348$) with set high-precision strong lensing models, which take advantage extensive spectroscopic information on many multiply lensed systems. In effort to understand and quantify inherent systematics in parametric modelling, we explore collection 22 models where use different samples multiple image families, parametrizations cosmological parameters. As input for CLASH HST imaging data follow-up...
We derive an accurate mass distribution of the galaxy cluster MACS J1206.2-0847 (z=0.439) from a combined weak-lensing distortion, magnification, and strong-lensing analysis wide-field Subaru BVRIz' imaging our recent 16-band Hubble Space Telescope observations taken as part Cluster Lensing And Supernova survey with (CLASH) program. find good agreement in regions overlap between several weak strong lensing reconstructions using wide variety modeling methods, ensuring consistency. The data...
We present a detailed mass reconstruction and novel study on the substructure properties in core of Cluster Lensing And Supernova survey with Hubble (CLASH) Frontier Fields galaxy cluster MACS J0416.1−2403. show employ our extensive spectroscopic data set taken VIsible Multi-Object Spectrograph instrument as part CLASH-VLT program, to confirm spectroscopically 10 strong lensing systems select sample 175 plausible members limiting stellar log (M*/M☉) ≃ 8.6. reproduce measured positions 30...
The effect of galactic orbits on a galaxy's internal evolution within galaxy cluster environment has been the focus heated debate in recent years. To understand this connection, we use both $(0.5 \,$Gpc)$^3$ and Gpc$^3$ boxes from cosmological hydrodynamical simulation set Magneticum Pathfinder. We investigate velocity-anisotropy, phase space, orbital up to $\sim 5 \cdot 10^{5}$ resolved satellite galaxies our sample 6776 clusters with $M_{\mathrm{vir}} > 10^{14} \, \mathrm{M_{\odot}}$ at...
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...
We carry out a detailed strong lensing analysis of sub-sample eight galaxy clusters the CLASH survey, in redshift range $ z_{\rm cluster} = [0.23-0.59]$, using extensive spectroscopic information, primarily MUSE archival data complemented with CLASH-VLT measurements. Different models are tested each cluster depending on complexity its mass distribution and number detected multiple images. Four show more than five spectroscopically confirmed image families. In this sample, we do not make use...
We study the stellar mass functions (SMFs) of star-forming and quiescent galaxies in 11 galaxy clusters at 1.0<z<1.4, drawn from Gemini Observations Galaxies Rich Early Environments (GOGREEN) survey. Based on more than 500 hours Gemini/GMOS spectroscopy, deep multi-band photometry taken with a range observatories, we probe SMFs down to limit 10^9.7 Msun (10^9.5 for galaxies). At this early epoch, fraction is already highly elevated compared field same redshift. The quenched excess (QFE)...