Simonetta Puccetti
A5011270437- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Mechanics and Biomechanics Studies
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Calibration and Measurement Techniques
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Neutrino Physics Research
- Astrophysics and Star Formation Studies
- Advanced X-ray Imaging Techniques
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- X-ray Spectroscopy and Fluorescence Analysis
- CCD and CMOS Imaging Sensors
- Dark Matter and Cosmic Phenomena
- Advanced X-ray and CT Imaging
National Institute for Astrophysics
2006-2024
Agenzia Spaziale Italiana
2015-2024
Geophysical Laboratory
2024
Institute for Space Astrophysics and Planetology
2022-2024
Boston University
2024
University of Pisa
2022-2023
Space (Italy)
2022
Marshall Space Flight Center
2021
University of Cagliari
2021
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2021
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...
The COSMOS-Legacy survey is a 4.6 Ms Chandra program that has imaged 2.2 deg$^2$ of the COSMOS field with an effective exposure $\simeq$160 ks over central 1.5 and $\simeq$80 in remaining area. combination 56 new observations, obtained as X-ray Visionary Project, previous C-COSMOS survey. We describe reduction analysis observations properties 2273 point sources detected above spurious probability 2$\times 10^{-5}$. also present updated data. whole includes 4016 (3814, 2920 2440 full, soft...
Spinning up an extragalactic neutron star Ultraluminous x-ray sources (ULXs) are strange objects in other galaxies that cannot be explained by conventional accretion onto stellar-mass objects. This has led to exotic interpretations, such as the long-sought intermediate-mass black holes. Israel et al. observed a ULX nearby galaxy NGC 5907 and found it is instead star. The spinning accreting material so fast its spin period quickly accelerating. only way can consume enough explain these...
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...
Bolometric luminosities and Eddington ratios of both X-ray selected broad-line (Type-1) narrow-line (Type-2) AGN from the XMM-Newton survey in COSMOS field are presented. The sample is composed by 929 (382 Type-1 547 Type-2 AGN) it covers a wide range redshifts, absorbing column densities. About 65% sources spectroscopically identified as either or (83% 52% respectively), while accurate photometric redshifts available for rest sample. study such large with high quality multi-wavelength...
We present the calibration of Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray satellite. used Crab as primary effective area calibrator and constructed a piece-wise linear spline function to modify vignetting response. The achieved residuals for all off-axis angles energies, compared assumed spectrum, are typically better than ±2% up 40 keV 5%–10% above due limited counting statistics. An empirical adjustment theoretical two-dimensional point-spread (PSF) was found using several strong...
In this paper, we release accurate photometric redshifts for 1692 counterparts to Chandra sources in the central square degree of Cosmic Evolution Survey (COSMOS) field. The availability a large training set spectroscopic that extends faint magnitudes enabled comparable highest quality results presently available normal galaxies. We demonstrate morphologically extended, X-ray without optical variability are more accurately described by library galaxies (corrected emission lines) than active...
The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, program that has imaged the central 0.9 deg2 of field down to limiting depths 1.9 × 10−16 erg cm−2 s−1 in soft (0.5–2 keV) band, 7.3 hard (2–10 and 5.7 full (0.5–10 band. In this paper we report i, K, 3.6 μm identifications 1761 X-ray point sources. We use likelihood ratio technique derive association optical/infrared counterparts for 97% For most remaining 3%, presence multiple or faintness possible counterpart prevented unique...
We present the best sensitivity and angular resolution maps of molecular disk outflow Mrk 231, as traced by CO observations obtained with IRAM/PdBI, we analyze archival Chandra NuSTAR observations. constrain physical properties both outflow, presence a highly-ionized ultra-fast nuclear wind, their connection. The has size ~1 kpc, extends in all directions around nucleus, being more prominent along south-west to north-east direction, suggesting wide-angle biconical geometry. maximum projected...
While X-ray Spectroscopy, Timing and Imaging have improved verymuch since 1962, when the first astronomical non-solar source was discovered, especially with launch of Newton/X-ray Multi-Mirror Mission, Rossi/X-ray Explorer Chandra/Advanced Astrophysics Facility, progress polarimetry has been meager. This is in part due to lack sensitive polarization detectors, fate approved missions because celestial sources appeared less polarized than expected. Only one positive measurement available until...
A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and accretes onto hole, which heats the sufficiently to emit x-rays. We report polarimetric observation of XRB Cygnus X-1 using Imaging Polarimetry Explorer. The electric field position angle aligns with outflowing jet, indicating that jet launched inner emitting region. polarization degree (4.01+-0.20)% at 2 8 kiloelectronvolts, implying accretion disk viewed closer edge-on than orbit. observations reveal...
Abstract Most of the light from blazars, active galactic nuclei with jets magnetized plasma that point nearly along line sight, is produced by high-energy particles, up to around 1 TeV. Although are known be ultimately powered a supermassive black hole, how particles accelerated such high energies has been an unanswered question. The process must related magnetic field, which can probed observations polarization jets. Measurements radio optical polarization—the only range available until...
ABSTRACT We present an X-ray spectropolarimetric analysis of the bright Seyfert galaxy NGC 4151. The source has been observed with Imaging Polarimetry Explorer (IXPE) for 700 ks, complemented simultaneous XMM–Newton (50 ks) and NuSTAR (100 pointings. A polarization degree Π = 4.9 ± 1.1 per cent angle Ψ 86° 7° east north (68 confidence level) are measured in 2–8 keV energy range. shows that could be entirely due to reflection. Given low reflection flux IXPE band, this requires, however, a...
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...
<i>Context. <i/>The COSMOS survey is a multiwavelength aimed to study the evolution of galaxies, AGN and large scale structures. Within this XMM-COSMOS powerful tool detect galaxy clusters. The deep X-ray over full 2 deg<sup>2<sup/> area. It consists 55 XMM-<i>Newton<i/> pointings for total exposure ~1.5 Ms with an average vignetting-corrected depth 40 ks across field view sky coverage 2.13 deg<sup>2<sup/>.<i>Aims. <i/>We present catalogue point-like sources detected EPIC CCD cameras,...
The COSMOS survey is a multiwavelength aimed to study the evolution of galaxies, AGN and large scale structure. XMM-COSMOS deep X-ray over full 2 deg2 area. It consists 55 XMM-Newton pointings for total exposure ~1.5 Ms with an average vignetting corrected depth 40 ks across field view sky coverage 2.13 deg2. We present catalogue point-like sources detected EPIC CCD cameras, logN-logS relations colour-colour diagrams. analysis was performed in 0.5-2 keV, 2-10 keV 5-10 energy bands....
We make use of deep HST, VLT, Spitzer, and Chandra data on the Deep Field-South to constrain number Compton-thick AGNs in this field. show that sources with high 24 μm-to-optical flux ratios red colors form a distinct source population, their infrared luminosity is dominated by AGN emission. Analysis X-ray properties these extreme shows most them (80% ± 15%) are indeed likely be highly obscured, AGNs. The infrared-selected, 5.8 μm higher than 1044.2 ergs s−1 turns out similar X-ray-selected,...
(abridged) We take advantage of the deep Chandra and Spitzer coverage a large area (more than 10 times covered by fields, CDFs in COSMOS field, to extend search highly obscured, Compton-thick active nuclei higher luminosity. These sources have low surface density samples can be provided only through surveys, like survey. analyze X-ray properties MIPS with 24$\mu$m fluxes 550$\mu$Jy. For not directly detected images we produce stacked soft hard X-rays bands. To estimate fraction AGN source...
We compute the effect of galactic absorption on active nucleus (AGN) emission in a cosmological context by including physical model for AGN feeding and feedback semianalytic galaxy formation. This is based interactions as triggers accretion expanding blast waves mechanism to propagate outwards energy injected into interstellar medium at center galaxies. first test our against observed number density AGNs with different intrinsic luminosities function redshift. The yields "downsizing"...
We report the results of a multi-band observing campaign on famous blazar 3C 279 conducted during phase increased activity from 2013 December to 2014 April, including first observations it with NuSTAR. The $\gamma$-ray emission source measured by Fermi-LAT showed multiple distinct flares reaching highest flux level in this object since beginning Fermi mission, $F(E > 100\,{\rm MeV})$ $10^{-5}$ photons cm$^{-2}$ s$^{-1}$, and doubling time scale as short 2 hours. spectrum one was very hard,...
We report on observations of NGC1068 with NuSTAR, which provide the best constraints to date its $>10$~keV spectral shape. find no strong variability over past two decades, consistent Compton-thick AGN classification. The combined Chandra, XMM-Newton, and Swift-BAT dataset offers new insights into complex reflected emission. critical combination high signal-to-noise NuSTAR data a spatial decomposition Chandra allow us break several model degeneracies greatly aid physical interpretation. When...