Matteo Bachetti
A5073598248- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Mechanics and Biomechanics Studies
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Advanced X-ray Imaging Techniques
- Geophysics and Gravity Measurements
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Neutrino Physics Research
- Scientific Measurement and Uncertainty Evaluation
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Calibration and Measurement Techniques
Osservatorio Astronomico di Cagliari
2015-2024
Institute for Space Astrophysics and Planetology
2023-2024
Centre National de la Recherche Scientifique
2011-2024
Observatoire astronomique de Strasbourg
2023-2024
Astronomical Observatory of Rome
2023
National Institute for Astrophysics
2014-2022
Marshall Space Flight Center
2021-2022
Massachusetts Institute of Technology
2022
Istituto Nazionale di Fisica Nucleare
2021
California Institute of Technology
2019-2021
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we summarize features in recent major release, version 5.0, updates on Project. We then discuss supporting a broader ecosystem interoperable packages, including connections with several...
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...
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we an overview organization project summarize features in package, recent major release, version 2.0. We then describe infrastructure designed facilitate support a broader ecosystem...
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...
Launched on 2021 December 9, the Imaging X-ray Polarimetry Explorer (IXPE) is a NASA Small Mission in collaboration with Italian Space Agency (ASI). The mission will open new window of investigation—imaging x-ray polarimetry. observatory features three identical telescopes, each consisting mirror module assembly polarization-sensitive imaging detector at focus. A coilable boom, deployed orbit, provides necessary 4-m focal length. utilizes three-axis-stabilized spacecraft, which services such...
XIPE, the X-ray Imaging Polarimetry Explorer, is a mission dedicated to Astronomy. At time of writing XIPE in competitive phase A as fourth medium size ESA (M4). It promises reopen polarimetry window high energy Astrophysics after more than 4 decades thanks detector that efficiently exploits photoelectric effect and optics with large effective area. uniqueness time-spectrally-spatially- resolved breakthrough astrophysics fundamental physics. Indeed payload consists three Gas Pixel Detectors...
Abstract We discovered 2.8 s pulsations in the X-ray emission of ultraluminous source (ULX) M51 ULX-7 within UNSEeN project, which was designed to hunt for new pulsating ULXs (PULXs) with XMM-Newton. The pulse shape is sinusoidal, and large variations its amplitude were observed even single exposures (pulsed fraction from less than 5% 20%). Source variable, generally at an luminosity between 10 39 40 erg −1 , located outskirts spiral galaxy M51a a distance 8.6 Mpc. According our analysis,...
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...
Abstract We report on an observational campaign the bright black hole (BH) X-ray binary Swift J1727.8–1613 centered around five observations by Imaging Polarimetry Explorer. These track for first time evolution of polarization a BH across hard to soft state transition. The 2–8 keV degree decreased from ∼4% ∼3% observations, but angle remained oriented in north–south direction throughout. Based with Australia Telescope Compact Array, we find that intrinsic 7.25 GHz radio aligns polarization....
We present broadband X-ray analyses of a sample bright ultraluminous sources with the goal investigating spectral similarity this population to known ULX pulsars, M82 X-2, NGC7793 P13 and NGC5907 ULX. perform phase-resolved analysis XMM-Newton+NuSTAR dataset ULX, finding that pulsed emission from accretion column in source exhibits similar shape seen both X-2 P13, is responsible for excess observed at highest energies when spectra are fit disk models. then demonstrate 'hard' excesses all...
We report the detection of weak pulsations from archetypal ultraluminous X-ray source (ULX) NGC 1313 X-2. Acceleration searches reveal sinusoidal in segments two out six new deep observations this object, with a period $\sim$ 1.5 s and pulsed fraction 5%. use Monte Carlo simulations to demonstrate that individual detections are unlikely originate false Poisson noise given their very close frequencies; strong similarity other detected ULXs also argues they real. The presence large bubble...
The black hole binary Cygnus X-1 was observed in late-2012 with the Nuclear Spectroscopic Telescope Array (NuSTAR) and Suzaku, providing spectral coverage over ~1-300 keV range. source soft state a multi-temperature blackbody, power-law, reflection components along absorption from highly ionized material system. high throughput of NuSTAR allows for very quality measurement complex iron line region as well rest component. is clearly broadened well-described by relativistic blurring model, an...
We present the results of NuSTAR and XMM-Newton observations two ultraluminous X-ray sources (ULX) NGC 1313 X-1 X-2. The combined spectral bandpass satellites enables us to produce first spectrum between 0.3 30 keV, while X-2 is not significantly detected by above 10 keV. data demonstrate that has a clear cutoff whose presence was only marginally detectable with previous observations. This rules out interpretation as black hole in standard low/hard state, it deeper than predicted for...
Ultraluminous pulsars are a definite proof that persistent super-Eddington accretion occurs in nature. They support the scenario according to which most X-ray Sources (ULXs) accretors of stellar mass rather than sub-Eddington intermediate black holes. An important prediction theories supercritical is existence powerful outflows moderately ionized gas at mildly relativistic speeds. In practice, spectral resolution gratings such as RGS onboard XMM-Newton required resolve their observational...
We present results from the coordinated broadband X-ray observations of extreme ultraluminous source Holmberg IX X-1 performed by NuSTAR, XMM-Newton and Suzaku in late 2012. These provide first high-quality spectra above 10 keV to date, extending coverage this remarkable up ~30 keV. Broadband were undertaken at two epochs, between which exhibited both flux strong spectral variability, increasing luminosity Lx = (1.90+/-0.03)e40 erg/s (3.35+/-0.03)e40 erg/s. Neither epoch exhibits a spectrum...
Due to be launched in late 2021, the Imaging X-Ray Polarimetry Explorer (IXPE) is a NASA Small mission designed perform polarization measurements 2-8 keV band, complemented with imaging, spectroscopy and timing capabilities. At heart of focal plane set three polarization-sensitive Gas Pixel Detectors (GPD), each based on custom ASIC acting as charge-collecting anode. In this paper we shall review design, manufacturing, test IXPE focal-plane detectors, particular emphasis connection between...
Aims: In light of recent discoveries pulsating ULXs and recently introduced models, that propose neutron stars (NSs) as the central engines ULXs, we revisit (XMM-Newton NuSTAR) spectra eighteen well known in search indications favor this new hypothesis. Results: We confirm the, previously noted, presence low energy (<6 keV) spectral rollover argue it could be interpreted thermal emission. The are described by a double model consisting "hot" (>1 "cool" (<0.7 multicolor black body (MCB). Under...
ABSTRACT The 6.67 hr periodicity and the variable X-ray flux of central compact object (CCO) at center supernova remnant RCW 103, named 1E 161348–5055, have been always difficult to interpret within standard scenarios an isolated neutron star (NS) or a binary system. On 2016 June 22, Burst Alert Telescope (BAT) on board Swift detected magnetar-like short burst from direction also coincident with large long-term outburst. Here, we report Chandra , Nuclear Spectroscopic Array (BAT XRT)...