A5051674275- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Mechanics and Biomechanics Studies
- High-pressure geophysics and materials
- Impact of Technology on Adolescents
- IoT and Edge/Fog Computing
- Network Security and Intrusion Detection
- Astronomical Observations and Instrumentation
- Advanced X-ray Imaging Techniques
- Behavioral Health and Interventions
- Music Therapy and Health
- Bullying, Victimization, and Aggression
- Blockchain Technology Applications and Security
- Traffic control and management
- Technology Adoption and User Behaviour
- Evacuation and Crowd Dynamics
- Privacy-Preserving Technologies in Data
- Neuroendocrine regulation and behavior
- Child Development and Digital Technology
- Particle Detector Development and Performance
- Adaptive optics and wavefront sensing
Southeast University
2023-2025
Tianjin University
2019-2024
Goddard Space Flight Center
1994-2021
University of Michigan
2019
Huazhong University of Science and Technology
2019
Yangtze University
2006-2012
East China Normal University
2004
MCG−6-30-15, at a distance of 37 Mpc (z = 0.008), is the archetypical Seyfert 1 galaxy showing very broad Fe Kα emission. We present results from joint NuSTAR and XMM-Newton observational campaign that, for first time, allows sensitive, time-resolved spectral analysis 0.35 keV up to 80 keV. The strong variability source best explained in terms intrinsic X-ray flux variations context light-bending model: primary, variable emission reprocessed by accretion disk, which produces secondary, less...
We present a broad band spectral analysis of the joint XMM-Newton and NuSTAR observational campaign Narrow Line Seyfert 1 SWIFT J2127.4+5654, consisting 300 ks performed during three orbits. detect relativistic broadened iron K$\alpha$ line originating from innermost regions accretion disc surrounding central black hole, which we infer an intermediate spin $a$=$0.58^{+0.11}_{-0.17}$. The intrinsic spectrum is steep ($\Gamma=2.08\pm0.01$) as commonly found in galaxies, while cutoff energy...
We present the first broadband 0.3-25.0 kev X-ray observations of bright ultraluminous source (ULX) Holmberg II X-1, performed by NuSTAR, XMM-Newton and Suzaku in September 2013. The NuSTAR data provide X-1 above 10 keV, reveal a very steep high-energy spectrum, similar to other ULXs observed date. These further demonstrate that exhibit spectral states are not typically seen Galactic black hole binaries. Comparison with sources implies accretes at high fraction its Eddington accretion rate,...
We present results obtained from two broadband X-ray observations of the extreme ultraluminous source (ULX) NGC 5907 ULX1, known to have a peak luminosity ∼5 × 1040 erg s−1. These XMM-Newton and NuSTAR observations, separated by only ∼4 days, revealed an level short-term flux variability. In first epoch, ULX1 was undetected NuSTAR, weakly detected (if at all) with XMM-Newton, while in second clearly high both missions. This implies increase ∼2 orders magnitude or more during this day window....
ABSTRACT SS433 is the only Galactic binary system known to persistently accrete at highly super-critical (or hyper-critical) rates, similar those in tidal disruption events, and likely needed explain rapid growth of very high redshift quasars containing massive SMBHs. Probing inner regions X-rays crucial understanding this system, accretion general, but challenging due obscuration by surrounding wind, driven from flow. NuSTAR observed hard X-ray band across multiple phases its 162 d...
We present the results from coordinated X-ray observations of ultraluminous source NGC 5204 X-1 performed by Nuclear Spectroscopic Telescope Array and XMM-Newton in early 2013. These provide first detection above , extending broadband coverage to . The were carried out two epochs separated approximately 10 days, showed little spectral variation with an observed luminosity erg s−1. spectrum robustly confirms presence a clear downturn seen some previous observations. This cutoff is...
To provide the census of sources contributing to X-ray background peak above 10 keV, NuSTAR is performing extragalactic surveys using a three-tier "wedding cake" approach. We present survey COSMOS field, medium sensitivity and area tier, covering 1.7 deg2 overlapping with both Chandra XMM-Newton data. This consists 121 observations for total exposure ~3 Ms. fully exploit these data, we developed new detection strategy, carefully tested through extensive simulations. The at 20% completeness...
We present NuSTAR observations of the bright Seyfert 2 galaxy NGC 2110 obtained in 2012, when source was at highest flux level ever observed, and 2013, a more typical level. include archival from other X-ray satellites, namely XMM-Newton, Suzaku, BeppoSAX, Chandra Swift. Simultaneous Swift broad band spectra (in 3-80 keV range) indicate cutoff energy $E_{\rm c}>210$ keV, with no detectable contribution Compton reflection. is one very few sources where evidence for distant thick scattering...
In this paper we report the results of an X-ray monitoring campaign on heavily obscured Seyfert galaxy Markarian 3 carried out between fall 2014 and spring 2015 with NuSTAR, Suzaku XMM-Newton. The hard spectrum is variable all time scales probed by our campaign, down to a few days. observed continuum variability due intrinsically primary seen in transmission through large, but still Compton-thin column density (N_H~0.8-1.1$\times$10$^{24}$ cm$^{-2}$). If arranged spherical-toroidal geometry,...
The behavior of quasi-periodic oscillations (QPOs) at frequencies near 1 kHz in the X-ray emission from neutron star binary 4U 1820-30 has been interpreted as evidence for existence marginally stable orbit, a key prediction strong-field general relativity. signature orbit is saturation QPO frequency (assumed to track inner disk radius) versus mass accretion rate. Previous studies have used count rate an indicator However, known not correlate robustly with or other sources. Here, we examine...
Abstract The social network is a structure made up of individuals who are tied by links. With the rapid development information technology, online networking services and microblogging service received lot attention. Social networks provide comprehensive communication platform interaction, knowledge sharing, dissemination to people, etc. They also bring significant impact on people’s working style interpersonal communication. Drawing from trait theory, regulatory focus followership political...
Due to the increasing need protect public security, this article studies security traffic patrolling (STP) problem, where a collection of police officers plan patrol around city. In STP, policy should not only take drivers' opportunistic behaviors into consideration but also satisfy frequency constraints such that hot-spot regions are patrolled at least once every several periods. Existing randomized methods efficient in reducing law violations can probabilistic manner. Traditional planning...
view Abstract Citations (5) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Search for Low-Energy Neutrinos from Galactic Gamma-Ray Sources Fukuda, Y. ; Hayakawa, T. Inoue, K. Ishida, Kajita, Koshio, Nakahata, M. Nakamura, Sakai, A. Shiozawa, Suzuki, J. Totsuka, Mori, Hirata, S. Kihara, Oyama, Yamada, Koshiba, Nishijima, Kajimura, Suda, Takei, H. Koga, Miyano, Miyata, Hara, Kishi, N. Nagashima, Takita, Yoshimoto, Kaneyuki, Takeuchi, Tanimori,...
Abstract NASA's NuSTAR observatory is the first focusing hard X-ray telescope. Launched in June 2012, sensitive 3–79 keV range with unprecedented ~17″ FWHM angular resolution above 12 keV, a result of its multilayer-coated optics and 10-m focal length. With large effective area (900 cm 2 at 10 keV), has point-source sensitivity ~100 times better than previous telescopes. Here we describe planned work on rotation-powered pulsars magnetars during nominal 2-yr baseline mission that just commenced.