Yongwei Dong
A5083253170- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Astro and Planetary Science
- Nuclear Physics and Applications
- Astronomical Observations and Instrumentation
- SAS software applications and methods
- Particle physics theoretical and experimental studies
- Advanced SAR Imaging Techniques
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Superconducting and THz Device Technology
- Stellar, planetary, and galactic studies
- Radar Systems and Signal Processing
- Inertial Sensor and Navigation
- Advanced Photonic Communication Systems
- Mechanics and Biomechanics Studies
- Geophysics and Gravity Measurements
- Microwave Imaging and Scattering Analysis
- Particle Accelerators and Free-Electron Lasers
Wenzhou Medical University
2025
Chinese Academy of Sciences
2015-2024
Institute of High Energy Physics
2014-2024
Purple Mountain Observatory
2024
University of Science and Technology of China
2024
Aerospace Information Research Institute
2022-2023
Institute of Electronics
2013-2021
University of Chinese Academy of Sciences
2017-2020
National Astronomical Observatories
2020
University of Pisa
2017
eXTP is a science mission designed to study the state of matter under extreme conditions density, gravity and magnetism. Primary goals are determination equation at supra-nuclear measurement QED effects in highly magnetized star, accretion strong-field regime gravity. targets include isolated binary neutron stars, strong magnetic field systems like magnetars, stellar-mass supermassive black holes. The carries unique unprecedented suite state-of-the-art scientific instruments enabling for...
We present the X-ray timing results of new black hole candidate (BHC) MAXI J1535-571 during its 2017 outburst from Hard Modulation Telescope (\emph{Insight}-HXMT) observations taken September 6 to 23. Following definitions given by \citet{Belloni2010}, we find that source exhibits state transitions Low/Hard (LHS) Intermediate (HIMS) and eventually Soft (SIMS). Quasi-periodic oscillations (QPOs) are found in intermediate states, which suggest different types QPOs. With large effective area...
The High Energy cosmic-Radiation Detection (HERD) facility is one of several space astronomy payloads the cosmic lighthouse program onboard China's Space Station, which planned for operation starting around 2020 about 10 years. main scientific objectives HERD are indirect dark matter search, precise ray spectrum and composition measurements up to knee energy, high energy gamma-ray monitoring survey. composed a 3-D cubic calorimeter (CALO) surrounded by microstrip silicon trackers (STKs) from...
Abstract Fast radio bursts (FRBs) are short pulses observed in band from cosmological distances, some of which emit repeating bursts. The physical origins these mysterious events have been subject to wide speculations and heated debates. One class models invoke soft gamma-ray repeaters (SGRs), or magnetars, as the sources FRBs. Magnetars rotating neutron stars with extremely strong magnetic field can sporadically X-ray (keV) (sub-MeV) duration 102 s 102 s. However, even though bright no...
The next generation of synthetic aperture radar (SAR) systems will need transmit and receive analog signals over a wide frequency range with large bandwidth to fulfil the increasing demands. Since performance digital microwave component is deteriorated at frequency, radio (RF) front-end capability conversion needed for beyond few gigahertz. However, widely employed RF mixers, inherent imperfect I-V characteristics nonlinear devices, generates many undesired mixing spurs, which restricts on...
We report on analysis of observations the bright transient X-ray pulsar \src obtained during its 2017-2018 giant outburst with Insight-HXMT, \emph{NuSTAR}, and \textit{Swift} observatories. focus discovery a sharp state transition timing spectral properties source at super-Eddington accretion rates, which we associate disk to radiation pressure dominated (RPD) state, first ever directly observed for magnetized neutron star. This occurs slightly higher luminosity compared already reported...
In this work, we report the in-orbit demonstration of X-ray pulsar navigation with Insight-Hard Modulation Telescope (Insight-HXMT), which was launched on Jun. 15th, 2017. The new method 'Significance Enhancement Pulse-profile Orbit-dynamics' (SEPO) is adopted to determine orbit observations only one pulsar. test, Crab chosen and observed by Insight-HXMT from Aug. 31th Sept. 5th in Using 5-day-long observation data, determined successfully three telescopes onboard - High Energy (HE), Medium...
Abstract The ability of the side-on transition radiation detector (TRD) for High Energy Radiation Detector (HERD) to accurately calibrate energy cosmic ray depends on precision in measuring and identifying Transition (TR) photons. This requires maximizing transmittance TR photons sensitive volume collection resulting electrons by detector. An optimization field cage is necessary both aspects. In response need high photon from side a uniform electric compact structure TRD, dual-width strip...
Pulsar navigation, which utilizes pulsar observations to determine the position or orbit of a spacecraft, has raised interests many countries. Several projects, such as NICER, have been proposed. POLAR on-board TG-2 space station China worked for about half year and its main task is measure polarization gamma-ray bursts. can also detect photons from pulsars due large effective area (about 200 cm2) wide field view (more than 2π Sr). In this work we report our first results testing navigation...
Corona cooling was detected previously from stacking a series of short type-I bursts occurred during the low/had state atoll outburst. Type-I are hence regarded as sharp probe to our better understanding on basic property corona. The launch first Chinese X-ray satellite Insight-HXMT has large detection area at hard X-rays which provide almost unique chance move further in this research field. We report corona by single burst showing up {\bf flare} 4U 1636-536. This duration $\sim$13 seconds...
We study the evolution of temporal properties MAXI 1820+070 during 2018 outburst in its hard state from MJD 58190 to 58289 with Insight-HXMT a broad energy band 1-150 keV. find different behaviors hardness ratio, fractional rms and time lag before after 58257, suggesting transition occurred at around this point. The observed lags between soft photons 1-5 keV higher bands, up 150 keV, are frequency-dependent: low-frequency range, 2-10 mHz, both timescale dozens seconds but without clear trend...
No robust detection of prompt electromagnetic counterparts to fast radio bursts (FRBs) has yet been obtained, in spite several multi-wavelength searches carried out so far. Specifically, X/gamma-ray are predicted by some models. We planned on searching for gamma-ray the Insight-Hard X-ray Modulation Telescope (Insight-HXMT) data, taking advantage unique combination large effective area keV-MeV energy range and sub-ms time resolution. selected 39 FRBs that were promptly visible from...
Abstract We performed the broadband (1–100 keV) spectral analysis of first Galactic Be ultraluminous X-ray pulsar (BeULX) Swift J0243.6+6124 observed by Insight-HXMT during 2017−2018 outburst. The results show transitions at two typical luminosities, roughly consistently with those reported previously via pure timing analysis. find that spectrum evolves and becomes softer has higher cutoff energies until luminosity reaches L 1 (∼1.5 × 10 38 erg s −1 ). Afterwards harder lower increases to 2...