A5091235501- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- High-pressure geophysics and materials
- Advanced X-ray Imaging Techniques
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Fluid Dynamics Simulations and Interactions
- Cosmology and Gravitation Theories
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Detector Development and Performance
- Advanced X-ray and CT Imaging
- Methane Hydrates and Related Phenomena
- Dark Matter and Cosmic Phenomena
- Geomagnetism and Paleomagnetism Studies
Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
2011-2024
National Institute for Astrophysics
2013-2024
Mylan (Switzerland)
2002
IFOM
2001
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
1999
University of Milano-Bicocca
1999
University of Milan
1998
The EPIC focal plane imaging spectrometers on XMM-Newton use CCDs to record the images and spectra of celestial X-ray sources focused by three mirrors. There is one camera at focus each mirror; two cameras contain seven MOS CCDs, while third uses twelve PN defining a circular field view 30′ diameter in case. were specially developed for EPIC, combine high quality with spectral resolution close Fano limit. A filter wheel carrying kinds transparent light blocking filter, fully closed, open...
We want to characterize the dynamical state of galaxy clusters detected with Sunyaev–Zeldovich (SZ) effect by Planck and compare them selected in X-rays survey. analysed a representative subsample SZ catalogue, containing 132 highest signal noise ratio their using as an indicator projected offset between peak X-ray emission position Brightest cluster galaxy. distribution this for SZ-selected sample three X-ray-selected samples (HIFLUGCS, MACS REXCESS). The distributions are significantly...
The Cluster HEritage project with XMM-Newton - Mass Assembly and Thermodynamics at the Endpoint of structure formation (CHEX-MATE) is a three mega-second Multi-Year Heritage Programme to obtain X-ray observations minimally-biased, signal-to-noise limited sample 118 galaxy clusters detected by Planck through Sunyaev-Zeldovich effect. programme, described in detail this paper, aims study ultimate products time mass. It composed census most recent objects have formed (Tier-1: 0.05 < z 0.2; 2 x...
Cold fronts have been observed in a large number of galaxy clusters. Understanding their nature and origin is primary importance for the investigation internal dynamics To gain insight on these features, we carry out statistical occurrence sample clusters with XMM-Newton correlate presence different cluster properties. We selected 45 starting from B55 flux limited by Edge et al. (1990) performed systematic search cold fronts. find that fraction host at least one front. are easily detected...
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...
In this work, we performed an analysis of the X-ray morphology 118 CHEX-MATE (Cluster HEritage project with XMM-Newton - Mass Assembly and Thermodynamics at Endpoint structure formation) galaxy clusters, aim to provide a classification their dynamical state. To investigate link between appearance state, considered four morphological parameters: surface brightness concentration, centroid shift, second- third-order power ratios. These indicators result be: strongly correlated each other,...
The "Cluster HEritage project with \xmm: Mass Assembly and Thermodynamics at the Endpoint of structure formation" (CHEX-MATE) is a multi-year Heritage program, to obtain homogeneous XMM-Newton observations representative sample 118 galaxy clusters. are tuned reconstruct distribution main thermodynamic quantities ICM up $R_{500}$ individual mass measurements, via hydrostatic-equilibrium equation, precision 15-20%. Temperature profiles necessary ingredient for scientific goals it thus crucial...
We present a temperature map and profile of the central part ( or 1/4 virial radius) Coma cluster. combined 5 overlapping pointings made with XMM/EPIC/MOS extracted spectra in boxes . The distribution around two galaxies is remarkably homogeneous (), contrary to previous ASCA results, suggesting that core actually relaxed state. At larger distance from cluster center we do see evidence for recent matter accretion. confirm cool area direction NGC 4921, probably due gas stripped an infalling...
We investigate the origin and nature of multiple sloshing cold fronts in core Abell 496 by direct comparison between observations dedicated hydrodynamical simulations. Our simulations model a minor merger with 4{\times}10^13M{\circ} subcluster crossing A496 from south-west to north-north-east, passing cluster south-east at pericentre distance 100 few kpc about 0.6 0.8 Gyr ago. The gas triggered can reproduce almost all observed features, e.g. characteristic spiral-like brightness residual...
We present results obtained with a new XMM-Newton observation of A2142, famous textbook example cluster multiple cold fronts, which has been studied in detail Chandra but whose large scale properties are presented here for the first time. report discovery front, most distant one ever detected galaxy cluster, at about Mpc from center to SE. Residual images, thermodynamics and metal abundance maps qualitatively agreement predictions numerical simulations sloshing phenomenon. However, scales...
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 investigate the statistical properties and origin of scatter within spatially resolved surface brightness profiles CHEX-MATE sample, formed by 118 galaxy clusters selected via SZ effect. These objects have been drawn from Planck catalogue cover a wide range masses, M$_{500}=[2-15] \times 10^{14} $M$_{\odot}$, redshift, z=[0.05,0.6]. derived emission measure determined full sample. found that there is critical scale, R$\sim 0.4 R_{500}$, which morphologically relaxed disturbed object...
We present a temperature map and profile of the central part (r < 20' or 1/4 virial radius) Coma cluster. combined 5 overlapping pointings made with XMM/EPIC/MOS extracted spectra in boxes 3.5' X 3.5'. The distribution around two galaxies is remarkably homogeneous (r<10'), contrary to previous ASCA results, suggesting that core actually relaxed state. At larger distance from cluster center we do see evidence for recent matter accretion. confirm cool area direction NGC 4921, probably...
We present the first metal abundance profiles for a representative sample of massive clusters. Our measurements extend to R 500 and are corrected systematic error plaguing previous outskirt estimates. flatten out at large radii, admittedly not new result, however radial range nature our extends its import well beyond findings. find no evidence segregation between cool-core non-cool-core systems ∼0.3 , implying that, as was found thermodynamic properties, physical state core does affect...
Context. Turbulence introduced into the intracluster medium (ICM) through cluster-merger events transfers energy to non-thermal components, and can trigger formation of diffuse synchrotron radio sources. Typical sources in form giant halos mini-halos are found merging relaxed cool-core galaxy clusters, respectively. On other hand, recent observations reveal an increasing complexity phenomenology. Aims. Abell 2142 (A2142) is a mildly disturbed cluster that exhibits uncommon thermal...
The connection between the thermal and non-thermal properties in galaxy clusters hosting radio halos seems fairly well established. However, a comprehensive analysis of such has only been done for integrated quantities (e.g. L X − P relation). In recent years, new-generation telescopes have enabled unprecedented possibility to study on spatially resolved basis. this work, we performed pilot investigate mentioned five targets by combining X-ray data from CHEX-MATE project with second release...
The intra-cluster medium is prone to turbulent motion that will contribute the non-thermal heating of gas, complicating use galaxy clusters as cosmological probes. Indirect approaches can estimate intensity and structure motions by studying associated fluctuations in gas density X-ray surface brightness. In this work, we aim constrain occurring CHEX-MATE sample obtain a detailed view their properties large population clusters. To do so, simulation-based approach parameters power spectrum...
X-ray observations of galaxy clusters are routinely used to derive radial distributions intracluster medium (ICM) thermodynamical properties, such as density and temperature. However, only allow access quantities projected on the celestial sphere, so an assumption three-dimensional distribution ICM is necessary. Usually, spherical geometry assumed. The aim this paper determine bias due approximation reconstruction profile a cluster sample intrinsic scatter profiles' particularly when...
The thermal and non-thermal components in galaxy clusters have properties that, although shaped from different physical phenomena, can share some similarities, mainly driven by their halo mass the accretion processes. Scaling relations been proven to exist for both studied X-ray (thermal) radio (non-thermal) bands. On side, integrated spatially resolved profiles shown a predictable correlated behaviour. At wavelength, such investigations are so far limited quantities (e.g. total power mass)....
X-ray astronomers often divide galaxy clusters into two classes: "cool core" (CC) and "non-cool (NCC) objects. The origin of this dichotomy has been the subject debate in recent years, between "evolutionary" models (where can evolve from CC to NCC, mainly through mergers) "primordial" state cluster is fixed "ab initio" by early mergers or pre-heating). We found that a well-defined sample (clusters GMRT Radio halo survey with available Chandra XMM-Newton data), none objects hosting giant...
We report results from a detailed study of the sloshing gas in core A496. detected low-temperature/entropy spiral feature found several cores. also that conduction between and ambient medium must be suppressed by more than one order magnitude compared with Spitzer conductivity. Intriguingly, while pattern features higher metal abundance surrounding medium, it follows relation entropy vs defined outside spiral. The most plausible explanation for this behavior is low-entropy metal-rich plasma...
Galaxy clusters are the products of structure formation through myriad physical processes that affect their growth and evolution throughout cosmic history. As a result, matter distribution within galaxy clusters, or shape, is influenced by cosmology astrophysical processes, in particular accretion new material due to gravity. We introduce an analysis method investigate 3D triaxial shapes from Cluster HEritage project with XMM-Newton -- Mass Assembly Thermodynamics at Endpoint (CHEX-MATE). In...
Combining XMM-Newton and Chandra data, we have performed a detailed study of Abell 3558. Our analysis shows that its dynamical history is more complicated than previously thought. We found some traits typical cool core clusters (surface brightness peaked at the center, metal abundance profile) others are common in merging clusters, like deviations from spherical symmetry thermodynamic quantities ICM. This last result has been achieved with new technique for deriving temperature maps images....
Context. Galaxy clusters grow through the accretion of mass over cosmic time. Their observed properties are then shaped by how baryons distribute and energy is diffused. Thus, a better understanding spatially resolved, projected thermodynamic intra-cluster medium (ICM) may provide more consistent picture act locally in shaping X-ray quantities these massive virialized or still collapsing structures. Aims. We study perturbations temperature (and density) distribution to evaluate characterize...
The crisis of the standard cooling flow model brought about by Chandra and XMM-Newton observations galaxy clusters has led to development several models that explore different heating processes in order assess whether they can quench flow. Among most appealing mechanisms are thermal conduction through buoyant gas deposited intracluster medium (ICM) active galactic nuclei (AGNs). We combine Virgo/M87 three satellites (Chandra, XMM-Newton, BeppoSAX) inspect dynamics ICM center cluster. Using...