A5082342035- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Particle Detector Development and Performance
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Astro and Planetary Science
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Scientific Measurement and Uncertainty Evaluation
- Advanced X-ray Imaging Techniques
- Geophysics and Gravity Measurements
- Superconducting and THz Device Technology
- Nuclear Physics and Applications
National Institute for Astrophysics
2016-2025
Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
2010-2024
Massachusetts Institute of Technology
2018
California Institute of Technology
2018
Brera Astronomical Observatory
2006-2010
University of Milan
1988-2005
IAC (United States)
2004
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2002-2003
Mylan (Switzerland)
2002
IFOM
2001
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...
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
We present the first set of XMM-Newton EPIC observations in 2 square degree COSMOS field. The strength project is unprecedented combination a large solid angle and sensitivity over whole multiwavelength spectrum. are very efficient localizing identifying active galactic nuclei (AGN) clusters as well groups galaxies. One primary goals Cosmos survey to study co-evolution function their environment Cosmic web. Here we log observations, images summary research highlights for pass 25 pointings...
The search for diffuse non-thermal inverse Compton (IC) emission from galaxy clusters at hard X-ray energies has been undertaken with many instruments, most detections being either of low significance or controversial. Background and contamination uncertainties present in the data non-focusing observatories result lower sensitivity to IC a greater chance false detection. We 266ks NuSTAR observations Bullet cluster, detected 3-30 keV. NuSTAR's unprecedented focusing capability largely...
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....
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 have measured the spectrum of Cosmic X-ray Background (CXB) in 2-8 keV range with high throughput EPIC/MOS instrument onboard XMM-Newton. A large sample galactic latitude observations was used, covering a total solid angle 5.5 square degrees. Our study is based on very careful characterization and subtraction instrumental background, which crucial for robust measurement faintest diffuse source sky. The CXB consistent power law having photon index Gamma=1.41+/-0.06 normalization...
We have determined the cosmological evolution of density active galactic nuclei (AGNs) and their NH distribution as a function unabsorbed 2-10 keV luminosity up to redshift 4. used HELLAS2XMM sample combined with other published catalogs, yielding total 508 AGNs. Our best fit is obtained luminosity-dependent (LDDE) model where low-luminosity (LX ~ 1043 ergs s-1) AGNs peak at z 0.7, while high-luminosity > 1045 2.0. A pure (PLE) can instead be rejected. There evidence that fraction absorbed...
The scientific instrumentation on board the X-ray Astronomy Satellite BeppoSAX includes a Medium Energy Concentrator Spectrometer (MECS), operating in energy range keV, which consists of three units, each composed grazing incidence Mirror Unit and position sensitive Gas Scintillation Proportional Counter. design performance MECS instrument are here described, together with its on-ground calibration.
We present XMM-Newton European Photon Imaging Camera (EPIC) observations of the bright Seyfert 1 galaxy MCG–6-30-15, focusing on broad Fe Kα line at ∼6 keV and associated reflection continuum, which is believed to originate from inner accretion disc. find these features be extremely redshifted, indicating an origin in very central regions It seems likely that we have caught this source 'deep minimum' state first observed by Iwasawa et al. The implied concentration X-ray illumination...
Hard X-ray radiation has been detected for the first time in Coma cluster by BeppoSAX. Thanks to unprecedented sensitivity of Phoswich Detection System (PDS) instrument, source up ~80 keV. There is clear evidence (4.5 sigma) non-thermal emission excess thermal above ~25 The hard very unlikely due X Comae, Seyfert 1 galaxy present field view PDS. A spectral tail inverse Compton on CMB photons predicted clusters, like Coma, with radio halos. Combining results observations, a volume-averaged...
We report results from the analysis of 21 nearby galaxy clusters, 11 with cooling flow (CF) and 10 without flow, observed BeppoSAX. The temperature profiles both CF non-CF systems are characterized by an isothermal core extending out to ~0.2r180; beyond this radius cluster rapidly decline. Our differ those derived other authors, who found either continuously declining or substantially flat profiles. Neither nor can be modeled a polytropic profile, reason being that at which break is much...
We present results from the photometric and spectroscopic identification of 122 X-ray sources recently discovered by XMM-Newton in 2-10 keV band (the HELLAS2XMM 1dF sample). Their flux cover range 8E-15-4E-13 cgs total area surveyed is 0.9 deg2. About 20% hard selected have an to optical ratio (X/O) ten times or more higher than that optically AGN. Unlike faint found ultra-deep Chandra surveys, which reach (and optical) fluxes one order magnitude lower survey sources, many extreme X/O our...
When selecting flux-limited cluster samples, the detection efficiency of X-ray instruments is not same for centrally-peaked and flat objects, which introduces a bias in samples. We quantify this effect case well-known sample, HIFLUGCS. simulate population clusters with various surface-brightness profiles, use instrumental characteristics ROSAT All-Sky Survey (RASS) to select samples similar HIFLUGCS sample predict expected bias. For comparison, we also estimate observationally using...
Aims. We measure radial temperature profiles as far out possible for a sample of ≈50 hot, intermediate redshift galaxy clusters, selected from the XMM-Newton archive, keeping systematic errors under control.
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...
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 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...
The X-ray Integral Field Unit (X-IFU) on board the Advanced Telescope for High-ENergy Astrophysics (Athena) will provide spatially resolved high-resolution spectroscopy from 0.2 to 12 keV, with 5 arc second pixels over a field of view minute equivalent diameter and spectral resolution 2.5 eV up 7 keV. In this paper, we first review core scientific objectives Athena, driving main performance parameters X-IFU, namely resolution, view, effective area, count rate capabilities, instrumental...
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...
We characterized the population of galaxy clusters detected with SZ effect Planck, by measuring cool core state objects in a well-defined subsample Planck catalogue. used as indicator concentration parameter Santos et al. (2008). The fraction is $29 \pm 4 \%$ and does not show significant indications evolution redshift range covered our sample. compare distribution sample one X-ray selected MACS (Mann & Ebeling, 2011): distributions are significantly different much higher ($59 5 \%$). Since...