A5112581244- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- CCD and CMOS Imaging Sensors
- Gamma-ray bursts and supernovae
- Advanced X-ray and CT Imaging
- Advanced Semiconductor Detectors and Materials
- Pulsars and Gravitational Waves Research
- Calibration and Measurement Techniques
- Astrophysics and Star Formation Studies
- Medical Imaging Techniques and Applications
- High-pressure geophysics and materials
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Radiation Detection and Scintillator Technologies
- Adaptive optics and wavefront sensing
- Advanced Electron Microscopy Techniques and Applications
- Galaxies: Formation, Evolution, Phenomena
- Radiation Effects in Electronics
- Nuclear Physics and Applications
- Photocathodes and Microchannel Plates
- Advanced Materials and Mechanics
- Geological and Geochemical Analysis
- Diatoms and Algae Research
- Spacecraft Design and Technology
National Astronomical Observatories
2011-2024
University of Chinese Academy of Sciences
2018-2024
Chinese Academy of Sciences
2011-2024
Tsinghua University
2008-2009
Abstract The Einstein Probe (EP) is an interdisciplinary mission of time-domain and X-ray astronomy. Equipped with a wide-field lobster-eye focusing imager, EP will discover cosmic transients monitor the variability known sources in 0.5–4 keV, at combination detecting sensitivity cadence that not accessible to previous current monitoring missions. can perform quick characterisation or outbursts Wolter-I telescope onboard. In this paper, science objectives are presented. expected enlarge...
The Einstein Probe (EP) is a mission designed to monitor the sky in soft X-ray band. It will perform systematic surveys and characterisation of high-energy transients monitoring variable objects at unprecedented sensitivity cadences. has large instantaneous field-of-view (3,600 sq. deg.), that realised via lobster-eye micro-pore focusing optics. EP also carries conventional telescope with larger effective area followup observations precise positioning newly-discovered transients. Alerts for...
Abstract The Lobster Eye Imager for Astronomy (LEIA) detected a new X-ray transient on 2022 November 7, identified as superflare event occurring nearby K-type giant star HD 251108. flux increase was also in follow-up observations at X-ray, UV, and optical wavelengths. flare lasted about 40 days soft observations, reaching peak luminosity of ∼1.1 × 10 34 erg s −1 0.5–4.0 keV, which is roughly 60 times the quiescent luminosity. Optical brightening observed only one night. light curve well...
The Einstein Probe (EP) is a small satellite dedicated to time-domain astronomy monitor the sky in soft X-ray band. It mission led by Chinese Academy of Sciences and developed its space science programme with international collaboration. Its wide-field imaging capability achieved using established technology micro-pore lobster-eye focusing optics. Complementary this deep follow-up enabled Wolter-I type telescope. EP also capable fast transient alerts triggering downlink, aiming at...
ABSTRACT The central engine that powers gamma-ray bursts (GRBs), the most powerful explosions in universe, is still not identified. Besides hyper-accreting black holes, rapidly spinning and highly magnetized neutron stars, known as millisecond magnetars, have been suggested to power both long short GRBs. presence of a magnetar following compact star mergers particular interest it would provide essential constraints on poorly understood equation state for stars. Indirect indications these...
Using a cross-correlation method, we study the X-ray halo of Cyg X-3. Two components dust distributions are needed to explain time lags derived by method. Assuming distance as 1.7 kpc for Cygnus OB2 association (a richest OB in local Galaxy) and another uniform distribution, get $7.2^{+0.3}_{-0.5}$ (68$%$ confidence level) When using estimation 1.38 or 1.82 kpc, inferred X-3 is $3.4^{+0.2}_{-0.2}$ $9.3^{+0.6}_{-0.4}$ respectively. The uncertainty mainly related OB2, which may be improved...
Scientific Complementary Metal Oxide Semiconductor (sCMOS) sensors are finding increasingly more applications in astronomical observations, thanks to their advantages over charge-coupled devices (CCDs) such as a higher readout frame rate, radiation tolerance, and working temperature. In this work, we investigate the performance at individual pixel level of large-format sCMOS sensor, GSENSE1516BSI, which has 4096 * pixels, each 15 {\mu}m size. To achieve this, three areas on consisting 99...
In recent years, the performance of Scientifc Complementary Metal Oxide Semiconductor (sCMOS) sensors has been improved signifcantly. Compared with CCD sensors, sCMOS have various advantages, making them potentially better devices for optical and X-ray detection, especially in time-domain astronomy. After a series tests we proposed new dedicated high-speed, large-format detector 2016 cooperating Gpixel Inc. This sensor physical size 6 cm by cm, an array 4096 pixels pixel 15 um. The frame...
The nature of the minute-to-hour long Fast X-ray Transients (FXTs) localised by telescopes such as Chandra, Swift, and XMM-Newton remains mysterious, with numerous models suggested for events. Here, we report multi-wavelength observations EP240315a, a 1600 s transient detected Einstein Probe, showing it to have redshift z=4.859. We measure low column density neutral hydrogen, indicating that event is embedded in low-density environment, further supported direct detection leaking ionising...
Abstract Since the idea of bionic Lobster eye micropore optics was put forward, possibility focusing hard X-rays by this new lightweight X-ray has been proposed. Limited technological conditions aspect ratio (≥500), low surface roughness (≤1 nm) and difficulty applying metal coatings inside such narrow square channels, high quality these have not realized. This work demonstrates test results for an Ultra-high (500:1) iridium-coated with microchannel plate technology atomic layer deposition...
Einstein Probe (EP) is a proposed small scientific satellite dedicated to time-domain astrophysics working in the soft X-ray band. It will discover transients and monitor variable objects 0.5-4 keV, for which it employ very large instantaneous field-of-view (60° × 60°), along with moderate spatial resolution (FWHM ∼ 5 arcmin). Its wide-field imaging capability be achieved by using established technology novel lobster-eye optics. In this paper, we present Monte-Carlo simulations focusing...
Complementary metal-oxide-semiconductor (CMOS) sensors are a competitive choice for future X-ray astronomy missions. Typically, CMOS on space astronomical telescopes exposed to high dose of irradiation. We investigate the impact irradiation performance two scientific (sCMOS) between −30 ° C and 20 at gain mode (7.5 × ), including bias map, readout noise, dark current, conversion gain, energy resolution. The irradiated with 50 MeV protons total 5.3 1010 p · cm − 2. After exposure, various...
China's Einstein Probe (EP) mission is designed for time-domain astrophysics with energy band of 0.5-4 keV. The payloads EP include a wide-field X-ray telescope (WXT) and follow-up (FXT). field view (FOV) WXT about 3600 square degrees sensitivity at least 10 times better than traditional all-sky monitors applying collimators or coded-masks. Back-side illuminated scientific CMOS (BSI sCMOS) the best choice after several types detectors are investigated. In this work, we study BSI sCMOS...
Wide-field X-ray Telescope (WXT) is a survey instrument of Einstein Probe, small-class mission dedicated to time-domain high-energy astrophysics discover transients and monitor variable objects in the 0.5-4.0keV X-rays.We aim characterize performance Qualification Model (QM) Probe -to determine half-energy width (HEW) on-axis off-axis, energydependent efficiency.The WXT optics assembly, consisting 36 Micro Pore Optic (MPO) chips divided into four 3x3 MPO sectors which focus onto separate...
In recent years, scientific CMOS (sCMOS) sensors have found increasing applications to X-ray detection, including Xray astronomical observations. order examine the performance of sCMOS sensors, we developed cameras based on sensors. Two cameras, CNX22 and CNX 66, been using with a photosensitive area 2 cm × 6 cm, respectively. The designs are presented in this paper. camera has frame rate 48 fps, whereas CNX66 currently 20 that can be boosted 100 fps future. operating temperature sensor...
Complementary metal-oxide-semiconductor (CMOS) detectors are a competitive choice for current and upcoming astronomical missions. To understand the performance variations of CMOS in space environment, we investigate total ionizing dose effects on custom-made large-format X-ray detectors. Three detector samples were irradiated with Co60 source 70 105 krad. We test compare these before after irradiation. After irradiation, dark increases by roughly 20∼100 times, readout noise from 3 e− to 6...
Lobster eye x ray micro pore optics (MPO) is a novel bionic optical technology with unique microchannel structure. All square microchannels point to the same spherical center position, providing wide field of view and high focusing imaging capabilities. Enhancing performance MPO has been significant challenge. This study introduces what we believe approach using stiffener staggered-square honeycomb structure design enhance properties devices. The test results show that multifiber enhances...