A5003321872- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Computational Physics and Python Applications
- Quantum Chromodynamics and Particle Interactions
- Astrophysical Phenomena and Observations
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Structural Analysis of Composite Materials
- Planetary Science and Exploration
- Advanced Optical Sensing Technologies
- Engineering and Materials Science Studies
- Atmospheric aerosols and clouds
- Distributed and Parallel Computing Systems
- Radiomics and Machine Learning in Medical Imaging
- AI in cancer detection
- Space Science and Extraterrestrial Life
- Advanced Algorithms and Applications
Xidian University
2025
Barnard College
2023-2024
Columbia University
2023-2024
China Agricultural University
2024
University of California, Los Angeles
2020-2023
University of Illinois Urbana-Champaign
2014-2023
Universidad Veritas
2020-2022
Tsinghua University
2020
The University of Adelaide
2017-2019
Center for Teaching Thinking
2019
The Galactic Center (GC) region hosts a variety of powerful astronomical sources and rare astrophysical processes that emit large flux non-thermal radiation. inner 375 pc x 600 region, called the Central Molecular Zone, is home to supermassive black hole Sagittarius A*, massive cloud complexes, particle accelerators such as supernova remnants. We present results our improved analysis very-high-energy (VHE) gamma-ray emission above 2 TeV from GC using 125 hours data taken with VERITAS...
Abstract Dark matter is a key piece of the current cosmological scenario, with weakly interacting massive particles (WIMPs) leading dark candidate. WIMPs have not been detected in their conventional parameter space (100 GeV ≲ M χ 100 TeV), mass range accessible Imaging Atmospheric Cherenkov Telescopes. As ultraheavy (UHDM; ≳ TeV) has suggested as an underexplored alternative to WIMP paradigm, we search for indirect annihilation signal higher (up 30 PeV) VERITAS γ -ray observatory. With 216...
Abstract We use the Very Energetic Radiation Imaging telescope Array System (VERITAS) imaging air Cherenkov array to obtain first measured angular diameter of β UMa at visual wavelengths using stellar intensity interferometry (SII) and independently constrain limb-darkened diameter. The age Ursa Major moving group has been assessed from ages its members, including nuclear member Merak ( UMa), an A1-type subgiant, by comparing effective temperature luminosity constraints model evolution...
The delineation of bone tumor boundaries is a critical issue in the field medical image segmentation due to unique positioning these tumors and complexity associated surgical procedures. In recent years, researchers have made significant strides determining through computer version methods. Doctors can achieve precise localization using U-Net network or improvements. However, boundary models based on single-modal images makes it challenging capture complete characteristics tumor. this paper,...
Abstract Assuming Galactic cosmic rays originate in supernovae and the winds of massive stars, starburst galaxies should produce very-high-energy (VHE; E > 100 GeV) gamma-ray emission via interaction their copious quantities with large reservoirs dense gas within galaxies. Such VHE was detected by VERITAS from galaxy M82 2008–09. An extensive, multiyear campaign followed these initial observations, yielding a total 254 hr good-quality data on M82. Leveraging modern analysis techniques...
Abstract While the sources of diffuse astrophysical neutrino flux detected by IceCube Neutrino Observatory are still largely unknown, one promising methods to improve our understanding them is investigating potential temporal and spatial correlations between alerts electromagnetic radiation from blazars. We report on multiwavelength target-of-opportunity observations blazar B3 2247+381, taken in response an multiplet alert for a cluster muon events compatible with source location 2022 May 20...
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 report on multiwavelength target-of-opportunity observations of the blazar PKS 0735+178, located 2.°2 away from best-fit position IceCube neutrino event IceCube-211208A detected 2021 December 8. The source was in a high-flux state optical, ultraviolet, X-ray, and GeV γ -ray bands around time event, exhibiting daily variability soft X-ray flux. data Swift-XRT NuSTAR characterize transition between low-energy high-energy components broadband spectral energy distribution (SED),...
Abstract The ground-based gamma-ray observatory Very Energetic Radiation Imaging Telescope Array System (VERITAS, https://veritas.sao.arizona.edu/ ) is sensitive to photons of astrophysical origin with energies in the range between ≈85 GeV and ≈30 TeV. instrument consists four 12 m diameter imaging Cherenkov telescopes operating at Fred Lawrence Whipple Observatory southern Arizona. VERITAS started four-telescope operations 2007 collects about 1100 hr good-weather data per year....
Abstract The radio source 3C 264, hosted by the giant elliptical galaxy NGC 3862, was observed with Very Energetic Radiation Imaging Telescope Array System (VERITAS) between 2017 February and 2019 May. These deep observations resulted in discovery of very high energy (VHE; E > 100 GeV) γ -ray emission from this active galaxy. An analysis ∼57 hr quality-selected live time yields a detection at position source, corresponding to statistical significance 7.8 standard deviations above...
The results of gamma-ray observations the binary system HESS J0632+057 collected during 450 hours over 15 years, between 2004 and 2019, are presented. Data taken with atmospheric Cherenkov telescopes H.E.S.S., MAGIC, VERITAS at energies above 350 GeV were used together X-ray obtained Swift-XRT, Chandra, XMM-Newton, NuSTAR, Suzaku. Some these accompanied by measurements H{\alpha} emission line. A significant detection modulation VHE fluxes a period 316.7+-4.4 days is reported, consistent...
We report the detection of very high energy gamma-ray emission from blazar S3 1227+25 (VER J1230+253) with Very Energetic Radiation Imaging Telescope Array System (VERITAS). VERITAS observations source were triggered by a hard-spectrum GeV flare on May 15, 2015 Fermi-Large Area (LAT). A combined five-hour exposure 16th and 18th resulted in strong 13$\sigma$ differential photon spectral index, $\Gamma$ = 3.8 $\pm$ 0.4, flux level at 9% Crab Nebula above 120 GeV. This also target opportunity...
HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m1"><mml:mo><</mml:mo><mml:mn>1</mml:mn><mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow><mml:mrow><mml:mo>″</mml:mo></mml:mrow></mml:msup></mml:math> full width at half maximum) and broad spectral coverage (0.2–80 keV) with an effective area far superior to current facilities (including XMM -Newton NuSTAR ) enable revolutionary new...
Geminga is the first pulsar around which a remarkable gamma-ray halo extending over few degrees was discovered at TeV energies by MILAGRO and HAWC later H.E.S.S., Fermi -LAT in GeV band. More middle-aged pulsars have exhibited halos, they are now recognised as an emerging class of Galactic sources. The emission appears late evolution stage pulsars, most plausibly explained inverse Compton scattering CMB interstellar photons relativistic electrons positrons escaping from wind nebulae. These...
Abstract In 2017 February, the blazar OJ 287 underwent a period of intense multiwavelength activity. It reached new historic peak in soft X-ray (0.3–10 keV) band, as measured by Swift Telescope. This event coincides with very-high-energy (VHE) γ -ray outburst that led VERITAS to detect emission above 100 GeV, detection significance 10 σ (from 2016 December 9 March 31). The time-averaged VHE spectrum was consistent power law (Γ = −3.81 ± 0.26) and an integral flux corresponding ∼2.4% Crab...
We report on the search for very-high-energy gamma-ray emission from regions around three nearby supersonic pulsars (PSR B0355+54, PSR J0357+3205 and J1740+1000) that exhibit long X-ray tails. To date there is no clear detection of TeV any pulsar tail prominent in or radio. provide upper limits flux, luminosity, also compare these with other wind nebulae detected X-rays model predictions. find at least one tails likely to be observations are a factor 2-3 more sensitive. The analysis...
Superluminous supernovae (SLSNe) are a rare class of stellar explosions with luminosities ~10-100 times greater than ordinary core-collapse supernovae. One popular model to explain the enhanced optical output hydrogen-poor (Type I) SLSNe invokes energy injection from rapidly spinning magnetar. A prediction in this case is that high-energy gamma rays, generated wind nebula magnetar, could escape through expanding supernova ejecta at late (months or more after peak). This paper presents search...
The Breakthrough Listen Initiative is conducting a program using multiple telescopes around the world to search for "technosignatures": artificial transmitters of extraterrestrial origin from beyond our solar system. VERITAS Collaboration joined this in 2018, and provides capability one particular technosignature: optical pulses few nanoseconds duration detectable over interstellar distances. We report here on analysis results dedicated observations targets conducted 2019 2020 archival data...
We report on a long-lasting, elevated gamma-ray flux state from VER J0521+211 observed by VERITAS, MAGIC, and Fermi-LAT in 2013 2014. The peak integral above 200 GeV measured with the nightly-binned light curve is $(8.8 \pm 0.4) \times 10^{-7} \;\text{ph}\;\text{m}^{-2}\; \text{s}^{-1}$, or ~37% of Crab Nebula flux. Multiwavelength observations X-ray, UV, optical instruments are also presented. A moderate correlation between X-ray TeV fluxes was observed, spectrum appeared harder when...
Abstract Blazars are known for their variability on a wide range of timescales at all wavelengths. Most studies TeV gamma-ray blazars focus short timescales, especially during flares. With decade observations from the Fermi -LAT and VERITAS, we present an extensive study long-term multiwavelength radio-to-gamma-ray flux-density variability, with addition couple short-time radio-structure optical polarization blazar 1ES 1215+303 ( z = 0.130), its emission 100 MeV to 30 TeV. Multiple strong...
HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m1"><mml:mo><</mml:mo><mml:mn>1</mml:mn><mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow><mml:mrow><mml:mo>″</mml:mo></mml:mrow></mml:msup></mml:math> FWHM) and broad spectral coverage (0.2–80 keV) with an effective area far superior to current facilities (including XMM-Newton NuSTAR) enable revolutionary new insights into variety of...
We use the VERITAS imaging air Cherenkov Telescope (IACT) array to obtain first measured angular diameter of $β$ UMa at visual wavelengths using stellar intensity interferometry (SII) and independently constrain limb-darkened diameter. The age Ursa Major moving group has been assessed from ages its members, including nuclear member Merak ($β$ UMa), an A1-type subgiant, by comparing effective temperature luminosity constraints model evolution tracks. Previous interferometric angular-diameter...