Da-Wei Han
A5107212170- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- CCD and CMOS Imaging Sensors
- Astrophysics and Cosmic Phenomena
- Advanced X-ray Imaging Techniques
- Calibration and Measurement Techniques
- Nuclear Physics and Applications
- Adaptive optics and wavefront sensing
- High-pressure geophysics and materials
- Infrared Target Detection Methodologies
- Geophysics and Gravity Measurements
- Superconducting Materials and Applications
- Stellar, planetary, and galactic studies
- Particle Accelerators and Free-Electron Lasers
- Semiconductor Quantum Structures and Devices
- Advanced X-ray and CT Imaging
- Radiation Effects in Electronics
- Advanced Frequency and Time Standards
- Image Processing Techniques and Applications
- Sensor Technology and Measurement Systems
- Musculoskeletal pain and rehabilitation
- X-ray Spectroscopy and Fluorescence Analysis
- Mechanics and Biomechanics Studies
Chinese Academy of Sciences
2010-2025
Institute of High Energy Physics
2014-2025
Xidian University
2025
Wenzhou Medical University
2024
University of Chinese Academy of Sciences
2024
GRB 221009A is the brightest gamma-ray burst ever detected since discovery of this kind energetic explosions. However, an accurate measurement prompt emission properties very challenging due to its exceptional brightness. With joint observations \textit{Insight}-HXMT and GECAM-C, we made unprecedentedly during first $\sim$1800 s 221009A, including precursor, main (ME, which dominates in flux), flaring early afterglow, hard X-ray soft band from $\sim$ 10 keV 6 MeV. Based on GECAM-C...
The origin(s) and mechanism(s) of fast radio bursts (FRBs), which are short pulses from cosmological distances, have remained a major puzzle since their discovery. We report strong Quasi-Periodic Oscillation(QPO) 40 Hz in the X-ray burst magnetar SGR J1935+2154 associated with FRB 200428, significantly detected Hard Modulation Telescope (Insight-HXMT) also hinted by Konus-Wind data. QPOs only been rarely detected; our 3.4 sigma (p-value is 2.9e-4) detection QPO reported here reveals...
Abstract The Follow-up X-ray Telescope (FXT) is one of the two main scientific instruments on board Einstein Probe astronomical satellite, which was launched in 2024 January. FXT focuses energy range 0.3–10 keV and mainly conducts follow-up observations transients burst sources. It consists units completely independent optical system detector (FXT-A FXT-B). focal plane adopts PNCCD provided by Max Planck Institute for Extraterrestrial Physics. designed to have three operating modes with...
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...
The Einstein Probe (EP) is an X-ray astronomical mission mainly devoting to time-domain astronomy. There are two main scientific payloads onboard EP, the Wide Field Telescope (WXT) based on lobster eye optics and Follow-up (FXT). FXT contains Wolter-1 mirrors with a pnCCD detector each focus. total effective area about 600 cm2 energy range 0.3-10 keV. cooled by pulse tube cooler enables high-resolution spectroscopy imaging combined excellent time resolution. It will also have several working...
Millisecond pulsars (MSPs) are known for their long-term stability. Using six years of observations from the Neutron Star Interior Composition Explorer (NICER), we have conducted an in-depth analysis X-ray timing results MSPs: PSRs B1937+21, B1821-24, J0437-4715, J0030+0451, J0218+4232, and J2124-3358. The stability parameter σz has been calculated, revealing remarkable precision on order 10−14 B1937+21 10−13 J0030+0451 over a timescale 1000 days. These findings underscore feasibility...
Abstract We present the observational results from a detailed timing analysis of black hole candidate EXO 1846–031 during its outburst in 2019 with observations Insight -HXMT, NICER and MAXI . This can be classified roughly into four different states. Type-C quasi-periodic oscillations (QPOs) observed by (about 0.1–6 Hz) -HXMT 0.7–8 are also reported this work. Meanwhile, we study various physical quantities related to QPO frequency. The rms–frequency relationship energy band 1–10 keV...
Abstract The recently discovered neutron star transient Swift J0243.6+6124 has been monitored by the Hard X-ray Modulation Telescope . Based on obtained data, we investigate broadband spectrum of source throughout outburst. We estimate flux and search for possible cyclotron line in spectrum. However, no evidence line-like features is found up to 150 keV. In absence any its energy spectrum, magnetic field based observed spin evolution applying two accretion torque models. both cases, get...