Stefano Tugliani
A5068841023- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Radiation Detection and Scintillator Technologies
- Radio Astronomy Observations and Technology
- Mechanics and Biomechanics Studies
- Nuclear Physics and Applications
- Neutrino Physics Research
- Advanced Semiconductor Detectors and Materials
- Particle Accelerators and Free-Electron Lasers
- Magnetic Field Sensors Techniques
- High-pressure geophysics and materials
- Plasma Diagnostics and Applications
- Medical Imaging Techniques and Applications
- GaN-based semiconductor devices and materials
- Particle physics theoretical and experimental studies
- Semiconductor materials and interfaces
- Solar and Space Plasma Dynamics
- Superconducting and THz Device Technology
- Semiconductor materials and devices
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2023-2024
University of Turin
2023-2024
University of Genoa
2022
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....
Abstract We report the first detection of X-ray polarization bright transient Swift J1727.8−1613 with Imaging Polarimetry Explorer. The observation was performed at beginning 2023 discovery outburst, when source resided in hard state. find a time- and energy-averaged degree 4.1% ± 0.2% angle 2.°2 1.°3 (errors 68% confidence level; this translates to ∼20 σ significance detection). This finding suggests that hot corona emitting bulk detected X-rays is elongated, rather than spherical....
Abstract Observations of linear polarization in the 2–8 keV energy range with Imaging X-ray Polarimetry Explorer (IXPE) explore magnetic field geometry and dynamics regions generating nonthermal radiation relativistic jets blazars. These jets, particularly blazars whose spectral distribution peaks at energies, emit X-rays via synchrotron from high-energy particles within jet. IXPE observations X-ray-selected BL Lac–type blazar 1ES 1959+650 on 2022 May 3–4 showed a significant degree Π x =...
Aims. We aim to probe the magnetic field geometry and particle acceleration mechanism in relativistic jets of supermassive black holes. Methods. conducted a polarimetry campaign from radio X-ray wavelengths high-synchrotron-peak (HSP) blazar Mrk 421, including Imaging Polarimetry Explorer (IXPE) measurements 2022 December 6–8. During IXPE observation, we also monitored 421 using Swift -XRT obtained single observation with XMM-Newton improve spectral analysis. The time-averaged polarization...
Abstract How astrophysical systems translate the kinetic energy of bulk motion into acceleration particles to very high energies is a pressing question. SS 433 microquasar that emits TeV γ -rays indicating presence high-energy particles. A region hard X-ray emission in eastern lobe was recently identified as an site. We observed this with Imaging Polarimetry Explorer and measured polarization degree range 38%–77%. The indicates magnetic field has well-ordered component if X-rays are due...
We report on a campaign the bright black hole X-ray binary Swift J1727.8$-$1613 centered around five observations by Imaging Polarimetry Explorer (IXPE). This is first time it has been possible to trace evolution of polarization across hard soft state transition. The 2--8 keV degree slowly decreased from $\sim$4\% $\sim$3\% observations, but remained in North-South direction throughout. Using Australia Telescope Compact Array (ATCA), we measure intrinsic 7.25 GHz radio align same direction....
Iridium films grown by pulsed laser deposition (PLD) show different critical temperatures ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T<sub>c</sub></i> ), which can be almost twice the of bulk. This difference is related to thickness and conditions. To understand this effect, we grew with configuration parameters: focusing, distance Ir target, time. We then measured analyzed film structural measurements X-ray diffraction (XRD), looking...
We present our study on the reconstruction of photoelectron tracks in gas pixel detectors used for astrophysical X-ray polarimetry. Our work aims to maximize performance convolutional neural networks (CNNs) predict impact point incoming X-rays from image track. A very high precision position is achieved thanks introduction an artificial sharpening process images. find that providing CNN-predicted as input state-of-the-art analytic analysis improves modulation factor ($\sim 1 \%$ at 3 keV and...
Observations of linear polarization in the 2-8 keV energy range with Imaging X-ray Polarimetry Explorer (IXPE) explore magnetic field geometry and dynamics regions generating non-thermal radiation relativistic jets blazars. These jets, particularly blazars whose spectral distribution peaks at energies, emit X-rays via synchrotron from high-energy particles within jet. IXPE observations selected BL Lac-type blazar 1ES 1959+650 2022 May 3-4 showed a significant degree $Π_\mathrm{x} = 8.0\% \pm...
The X-ray Calibration Facility (XCF) is a table-top, open-design irradiation setup for research, available at the Physics Department of University Turin. It offers beams photons different energies and with various spatial polarization configurations. These characteristics allow XCF to be suitable facility calibration test energy, position sensitive detectors.
We report the first detection of X-ray polarization bright transient Swift J1727.8-1613 with Imaging Polarimetry Explorer. The observation was performed at beginning 2023 discovery outburst, when source resided in hard state. find a time- and energy-averaged degree 4.1%+/-0.2% angle 2.2+/-1.3 degrees (errors 68% confidence level; this translates to about 20-sigma significance detection). This finding suggests that hot corona emitting bulk detected X-rays is elongated, rather than spherical....
We conducted a polarimetry campaign from radio to X-ray wavelengths of the high-synchrotron-peak (HSP) blazar Mrk 421, including Imaging Polarimetry Explorer (IXPE) measurements on 2022 December 6-8. detected polarization 421 with degree $\Pi_{\rm X}$=14$\pm$1$\%$ and an electric-vector position angle $\psi_{\rm X}$=107$\pm$3$^{\circ}$ in 2-8 keV band. From time variability analysis, we find significant episodic variation X}$. During 7 months first IXPE pointing May, X}$ varied across range...
We present our study on the reconstruction of photoelectron tracks in gas pixel detectors used for astrophysical X-ray polarimetry. Our work aims to maximize performance convolutional neural networks (CNNs) predict impact point incoming X-rays from image track. A very high precision position is achieved thanks introduction an artificial sharpening process images. find that providing CNN-predicted as input state-of-the-art analytic analysis improves modulation factor ($\sim 1 \%$ at 3 keV and...
How astrophysical systems translate the kinetic energy of bulk motion into acceleration particles to very high energies is a pressing question. SS 433 microquasar that emits TeV gamma-rays indicating presence high-energy particles. A region hard X-ray emission in eastern lobe was recently identified as an site. We observed this with Imaging Polarimetry Explorer and measured polarization degree range 38% 77%. The indicates magnetic field has well ordered component if X-rays are due...
We present the first X-ray polarimetric study of dipping accreting neutron star 4U 1624$-$49 with Imaging Polarimetry Explorer (IXPE). report a detection polarization in non-dip time intervals confidence level 99.99%. find an average degree (PD) $3.1\pm0.7$% and angle $81\pm6$ degrees east north 2-8 keV band. upper limit on PD 22% during dips 95% confidence. The increases energy, reaching from $3.0\pm0.9$% 4-6 band to $6\pm2$% 6-8 This indicates likely arises Comptonization. high observed is...