A5077110011- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Superconducting Materials and Applications
- Neutrino Physics Research
- Advanced X-ray Imaging Techniques
- Advanced Semiconductor Detectors and Materials
- T-cell and B-cell Immunology
- Galaxies: Formation, Evolution, Phenomena
- Dark Matter and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Recommender Systems and Techniques
- Image Retrieval and Classification Techniques
- Monoclonal and Polyclonal Antibodies Research
Shandong Jiaotong University
2024
Chungbuk National University
2017-2024
Heilongjiang University of Science and Technology
2022-2023
Compact Imaging (United States)
2023
Barnard College
2021
New York University Abu Dhabi
2021
University of Manitoba
2021
Los Alamos National Laboratory
2021
Queen's University
2021
North Carolina State University
2021
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
We present the calibration of Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray satellite. used Crab as primary effective area calibrator and constructed a piece-wise linear spline function to modify vignetting response. The achieved residuals for all off-axis angles energies, compared assumed spectrum, are typically better than ±2% up 40 keV 5%–10% above due limited counting statistics. An empirical adjustment theoretical two-dimensional point-spread (PSF) was found using several strong...
We report the discovery of 3.76 s pulsations from a new burst source near Sgr A* observed by NuSTAR observatory. The strong signal SGR J1745−29 presents complex pulse profile modulated with pulsed fraction 27% ± 3% in 3–10 keV band. Two observations spaced nine days apart yield spin-down rate =(6.5 1.4) × 10−12. This implies magnetic field B = 1.6 1014 G, power =5 1033 erg s−1, and characteristic age P/2 =9 103 yr for rotating dipole model. However, current may be erratic, especially during...
Stellar metals shine toward our eyes only Taking a different look at familiar star may still yield surprises. Boggs et al. trained the x-ray vision of NuSTAR observatory on well-studied supernova 1987A. Core-collapse explosions such as SN 1987A produce titanium isotope, 44 Ti, whose radioactive decay yields hard emission lines. All associated with 44Ti appears to be from material moving us, none away. This implies that explosion was not symmetric. These findings help explain mechanics and...
The <i>Nuclear Spectroscopic Telescope Array (NuSTAR)</i> is a NASA Small Explorer mission that will carry the first focusing hard X-ray (6 - 80 keV) telescope to orbit. <i>NuSTAR</i> offer factor 50 100 sensitivity improvement compared previous collimated or coded mask imagers have operated in this energy band. In addition, provides sub-arcminute imaging with good spectral resolution over 12-arcminute eld of view. After launch, out two-year primary science focuses on four key programs:...
We present broadband (3–78 keV) NuSTAR X-ray imaging and spectroscopy of the Crab nebula pulsar. show that while phase-averaged spatially integrated + pulsar spectrum is a power law in this energy band, resolved finds break at ∼9 keV spectral photon index torus structure with steepening characterized by ΔΓ ∼ 0.25. also confirm previously reported pulsed spectrum, quantify it broken ∼12 0.27. maps inner 100'' remnant measure size as function seven bands. These results find rate shrinkage can...
We present the X-ray timing and spectral evolution of Galactic Center magnetar SGR J1745-2900 for first ~4 months post-discovery using data obtained with Nuclear Spectroscopic Telescope Array (NuSTAR)} Swift observatories. Our analysis reveals a large increase in spin-down rate by factor 2.60 +/- 0.07 over our span. further show that change spin was likely coincident bright burst observed 2013 June Swift, if so, there no accompanying discontinuity frequency. find source 3-10 keV flux has...
We describe the fabrication of two NuSTAR flight optics modules. The modules are glass-graphiteepoxy composite structures to be employed for first time in space-based X-ray by NuSTAR, a NASA Small Explorer schedule launch February 2012. discuss manufacturing process, qualification and environmental testing performed, briefly results performance integration alignment completed into instrument is described as module thermal shields.
We report NuSTAR observations of the millisecond pulsar–low-mass X-ray binary (LMXB) transition system PSR J1023+0038 from 2013 June and October, before after formation an accretion disk around neutron star. Between 10 12, a few days to two weeks radio disappearance pulsar, 3–79 keV spectrum was well fit by simple power law with photon index (at 90% confidence) luminosity 7.4 ± 0.4 × 1032 erg s−1. Significant orbital modulation observed fraction 36% 10%. During October 19–21 observation, is...
The hard X-ray emission from magnetars and other isolated neutron stars remains under-explored. An instrument with higher sensitivity to X-rays is critical understanding the physics of star magnetospheres also relationship between Fast Radio Bursts (FRBs). High required determine number tails, track transient non-thermal these sources for years post-outburst. This would enable previously impossible studies faint middle-aged rotation-powered pulsars (RPPs), detailed phase-resolved...
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission was launched on 2012 June 13 and is the first focusing high-energy X-ray telescope in orbit operating above ~10 keV. NuSTAR flies two co-aligned Wolter-I conical approximation optics, coated with Pt/C W/Si multilayers, combined a focal length of 10.14 meters this enables operation from 3-79 optics focus onto plane arrays, each consisting 4 CdZnTe pixel detectors, for field view 12.5 arcminutes. inherently low background associated...
Abstract HAWC J1826−128 is one of the brightest Galactic TeV γ -ray sources detected by High Altitude Water Cherenkov (HAWC) observatory, with photon energies extending up to nearly ∼100 TeV. This source spatially coincides H.E.S.S. HESS J1826−130 and “Eel” pulsar wind nebula (PWN), which associated GeV PSR J1826−1256. In X-ray band, Chandra XMM-Newton revealed that Eel PWN composed both a compact (∼15″) diffuse emission (∼6′ × 2′) away from pulsar. Our NuSTAR observation hard ∼20 keV...
We report on a 350-ks NuSTAR observation of the magnetar 1E 1841-045 taken in 2013 September. During observation, detected six bursts short duration, with $T_{90}<1$ s. An elevated level emission tail is after brightest burst, persisting for $\sim$1 ks. The showed power-law decay temporal index 0.5 before returning to persistent level. long also provided detailed phase-resolved spectra X-ray source. By comparing spectrum that previously reported, we find source hard-band has been stable over...
We model millisecond pulsars winds colliding with radiatively-driven companion in black widow and redback systems. For the redbacks, geometry of this intrabinary shock (IBS) is quite sensitive to expected equatorial concentration pulsar outflow. thus analytically extend IBS thin-shock models $\sim \sin^{2n}\theta$ winds. compute synchrotron emission from such shocks, including build-up cooling particle population as it accelerates along IBS. reasonable parameters, flux dominates binary X-ray...
We report the detection of eight bright X-ray bursts from 6.5 s magnetar 1E 1048.1−5937, during a 2013 July observation campaign with Nuclear Spectroscopic Telescope Array. study morphological and spectral properties these their evolution time. The resulted in count rate increases by orders magnitude, sometimes limited detector dead time, showed blackbody spectra kT ∼ 6–8 keV T90 duration 1–4 s, similar to earlier detected source. find that tail can be modeled an absorbed temperature...
We present NuSTAR high-energy X-ray observations of the pulsar wind nebula (PWN)/supernova remnant G21.5−0.9. detect integrated emission from up to ∼40 keV, and resolve individual spatial features over a broad band for first time. The morphology seen by agrees well with that XMM-Newton Chandra below 10 keV. At high energies, clearly detects non-thermal ∼20 keV extends along eastern northern rim supernova shell. broadband images demonstrate North Spur Eastern Limb results predominantly...
We present temporal and spectral analysis of simultaneous 0.5-79 keV Swift-XRT NuSTAR observations the magnetar 4U 0142+61. The pulse profile changes significantly with photon energy between 3 35 keV. fraction increases energy, reaching a value ~20%, similar to that observed in 1E 1841-045 much lower than ~80% 2259+586. do not detect 55-ks phase modulation reported previous Suzaku-HXD observations. phase-averaged spectrum 0142+61 above 20 is dominated by hard power law index, $\Gamma$ ~...
The Nuclear Spectroscopic Telescope Array (NuSTAR) is a NASA satellite mission scheduled for launch in 2011. Using focusing optics with multilayer coating enhanced reflectivity of hard X-rays (6-79 keV), NuSTAR will provide combination clarity, sensitivity and spectral resolution surpassing the largest observatories this band by orders magnitude. This advance allow to test theories how heavy elements are born, discover collapsed stars black holes on all scales explore most extreme physical...
The Nuclear Spectroscopic Telescope Array (NuSTAR) is a NASA Small Explorer mission scheduled for launch in February 2012. NuSTAR will deploy two imaging CdZnTe spectrometers the 6-79 keV energy band. optics utilize multilayer-coated, thermally-slumped glass integrated into titanium-glass-epoxy-graphite composite structure, along with an extendable mast, to obtain 10.15 meter focal length. Using this approach, subarcminute large effective area over its entire NuSTAR's conic-approximation...
We report new spectral and temporal observations of the magnetar 1E 1841-045 in Kes 73 supernova remnant obtained with Nuclear Spectroscopic Telescope Array (NuSTAR). Combined Swift archival XMM-Newton Chandra observations, phase-averaged spectrum is well characterized by a blackbody plus double power-law model, agreement previous, multi-mission X-ray results. However, we are unable to reproduce results reported using Suzaku observations. The pulsed fraction source found increase photon...
We report on NuSTAR, XMM-Newton, and Swift observations of the gamma-ray binary 1FGL J1018.6–5856. measure orbital period to be 16.544 ± 0.008 days using data spanning 1900 days. The is different from 2011 measurement which was used in previous X-ray study An et al. ∼400 data, but consistent with a new solution reported 2014. light curve folded qualitatively similar that previously, having spike at phase 0 broad sinusoidal modulation. flux enhancement occurs more regularly time than...
We report on spectral and timing properties of the magnetar CXOU J164710.2−455216 in massive star cluster Westerlund 1. Using 11 archival observations obtained with Chandra XMM-Newton over approximately 1000 days after source's 2006 outburst, we study flux evolution source. show that hardness source, as quantified by ratio, blackbody temperature, or power-law photon index, shows a clear correlation 2–10 keV absorption-corrected component decayed faster than for first ∼100 days. also measure...
NuSTAR observed G1.9+0.3, the youngest known supernova remnant in Milky Way, for 350 ks and detected emission up to ∼30 keV. The remnant's X-ray morphology does not change significantly across energy range from 3 20 A combined fit between Chandra shows that spectrum steepens with energy. spectral shape can be well fitted synchrotron a power-law electron distribution an exponential cutoff no additional features. It also described by purely phenomenological model such as broken power law or...
We report on new broad band spectral and temporal observations of the magnetar 1E 2259+586, which is located in supernova remnant CTB 109. Our data were obtained simultaneously with Nuclear Spectroscopic Telescope Array (NuSTAR) Swift, cover energy range from 0.5–79 keV. present pulse profiles various bands compare them to previous RXTE results. The NuSTAR show pulsations above 20 keV for first time we evidence that one pulses double-peaked profile shifts position energy. pulsed fraction...