A5103890400- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Particle Detector Development and Performance
- High-pressure geophysics and materials
- History and Developments in Astronomy
- Superconducting and THz Device Technology
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Relativity and Gravitational Theory
- Particle Accelerators and Free-Electron Lasers
Osservatorio astronomico di Bologna
2011-2024
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2015-2024
National Institute for Astrophysics
2014-2024
Institut d'Astrophysique Spatiale
2024
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2018-2021
Laboratoire d’Astrophysique de Marseille
2019-2020
Center for Astrophysics Harvard & Smithsonian
2019
Centrum Badań Kosmicznych
2018
Polish Academy of Sciences
2018
We report subarcsec-resolution X-ray imaging of the core Perseus cluster around galaxy NGC 1275 with Chandra Observatory. The ROSAT-discovered holes associated radio lobes have bright rims which are cooler than surrounding gas and not due to shocks. themselves may contain some hotter gas. map strong photoelectric absorption across Northern lobe rim a small infalling irregular galaxy, known as high velocity system. Two outer holes, one was previously known, identified recently found spurs...
This White Paper, submitted to the recent ESA call for science themes define its future large missions, advocates need a transformational leap in our understanding of two key questions astrophysics: 1) How does ordinary matter assemble into scale structures that we see today? 2) do black holes grow and shape Universe? Hot gas clusters, groups intergalactic medium dominates baryonic content local Universe. To understand astrophysical processes responsible formation assembly these structures,...
The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra} program that has imaged the central 0.5 sq.deg of field (centered at 10h, +02deg) with an effective exposure ~160ksec, and outer 0.4sq.deg. area ~80ksec. limiting source detection depths are 1.9e-16 erg cm(-2) s(-1) in Soft (0.5-2 keV) band, 7.3e(-16) cm^-2 s^-1 Hard (2-10 5.7e(-16) Full (0.5-10 band. Here we describe strategy, design execution C-COSMOS survey, present catalog 1761 point sources detected probability being...
<i>Context. <i/>Among the methods employed to measure mass of galaxy clusters, techniques based on lensing and X-ray analyses are perhaps most widely used; however, comparison between these estimates is often difficult and, in several results apparently inconsistent.<i>Aims. <i/>We aim at investigating potential biases cluster profiles.<i>Methods. performed realistic simulations observations that were subsequently analyzed using observational techniques. The resulting compared with input...
We present the XXL Survey, largest XMM programme totaling some 6.9 Ms to date and involving an international consortium of roughly 100 members. The Survey covers two extragalactic areas 25 deg2 each at a point-source sensitivity ~ 5E-15 erg/sec/cm2 in [0.5-2] keV band (completeness limit). survey's main goals are provide constraints on dark energy equation state from space-time distribution clusters galaxies serve as pathfinder for future, wide-area X-ray missions. review science objectives,...
The X-ray Integral Field Unit (X-IFU) is the high resolution spectrometer of ESA Athena observatory. Over a field view 5' equivalent diameter, it will deliver spectra from 0.2 to 12 keV with spectral 2.5 eV up 7 on ∼ 5" pixels. X-IFU based large format array super-conducting molybdenum-gold Transition Edge Sensors cooled at 90 mK, each coupled an absorber made gold and bismuth pitch 249 μm. A cryogenic anti-coincidence detector located underneath prime TES enables non background be reduced....
We introduce the THE THREE HUNDRED project, an endeavour to model 324 large galaxy clusters with full-physics hydrodynamical re-simulations. Here we present data set and study differences observations for fundamental cluster properties scaling relations. find that modelled are generally in reasonable agreement respect baryonic fractions gas relations at redshift z = 0. However, there still some (model-dependent) differences, such as central galaxies being too massive, colours (g - r) bluer...
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 examine the systematics affecting X-ray mass estimators applied to a set of five galaxy clusters resolved at high resolution in hydrodynamic simulations, including cooling, star formation and feedback processes. These simulated objects are processed through Map Simulator, X-MAS, provide Chandra-like long exposures that analysed reconstruct gas temperature, density profiles used as input. have different dynamic state: we consider hot cluster with temperature T= 11.4 keV, perturbed 3.9...
The frequently observed association between giant radio halos (RHs) and merging galaxy clusters has driven present theoretical models of non-thermal emission from clusters, which are based on the idea that energy dissipated during cluster–cluster mergers could power formation RHs. To quantitatively test merger–halo connection, we first statistical study deep data X-ray observations a complete X-ray-selected sample with luminosity ⩾5 × 1044 erg s−1 redshift 0.2 ⩽ z 0.32. Using several methods...
(Abriged) We present the analysis of baryonic content 52 X-ray luminous galaxy clusters observed with Chandra in redshift range 0.3-1.273. use deprojected surface brightness profiles and measured values gas temperature to recover total mass profiles. By assuming that are representative cosmic baryon budget, distribution cluster fraction hottest (T> 4 keV) systems as a function is used constrain cosmological parameters. discuss how our constraints affected by several systematics, namely...
In this paper we study the iron content of a sample 22 nearby hot clusters observed with BeppoSAX. We find that global mass is tightly related to cluster luminosity and relatively loose correlation between temperature follows from combination vs. correlations. The found scale linearly intracluster gas mass, implying abundance in roughly constant. This result suggests enrichment mechanisms operate at similar rate all clusters. By employing population synthesis chemical models, show associated...
We present the first results of ESO/GOODS program spectroscopy faint galaxies in Chandra Deep Field South (CDF-S). 399 spectra 303 unique targets have been obtained service mode with FORS2 spectrograph at ESO/VLT, providing 234 redshift determinations (the median distribution is 1.04). The typical uncertainty estimated to be . Galaxies color selected a way that resulting typically spans from 2. reduced and derived redshifts are released community through ESO web page...
[Abridged] We present a comparison between weak-lensing (WL) and X-ray mass estimates of sample numerically simulated clusters. The consists on the 20 most massive objects at redshift z=0.25 Mvir > 5 x 10^{14} Msun h^{-1}. They were found in cosmological simulation volume 1 h^{-3} Gpc^3, evolved framework WMAP-7 normalized cosmology. Each cluster has been resimulated higher resolution with more complex gas physics. processed it thought Skylens X-MAS to generate optical mock observations...
Context. Galaxy clusters represent valuable cosmological probes using tests that mainly rely on measurements of cluster masses and baryon fractions. X-ray observations one the main tools for uncovering these quantities.
We propose a novel method to constrain turbulence and bulk motions in massive galaxies, groups clusters, exploring both simulations observations. As emerged the recent picture of top-down multiphase condensation, hot gaseous halos are tightly linked all other phases terms cospatiality thermodynamics. While (10^7 K) perturbed by subsonic turbulence, warm (10^4 ionized neutral filaments condense out turbulent eddies. The peaks into cold molecular clouds (< 100 raining core via chaotic...
We carry out an analysis of a set cosmological SPH hydrodynamical simulations galaxy clusters and groups aimed at studying the total baryon budget in clusters, how this is shared between hot diffuse component stellar component. Using TreePM+SPH GADGET-3 code, we carried one non-radiative simulations, two sets including radiative cooling, star formation feedback from supernovae (SN), which also accounting for effect active galactic nuclei (AGN). The with twofold aim implication gas content on...
Many galaxy clusters host Megaparsec-scale radio halos, generated by ultrarelativistic electrons in the magnetized intracluster medium. Correlations between power of halos and thermal properties hosting were established last decade, including connection presence a halo cluster mergers. The X-ray luminosity redshift limited Extended GMRT Radio Halo Survey provides rich unique dataset for statistical studies halos. We uniformly analyze data sample, use new Planck SZ catalog, to revisit...
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...
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 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...