A5090787464- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Seismic Waves and Analysis
- Astrophysical Phenomena and Observations
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Earthquake Detection and Analysis
Yunnan University
2015-2022
Abstract 1LHAASO J0249+6022 is an extended very-high-energy γ -ray source discovered by the Large High-Altitude Air Shower Observatory. Based on nearly 16.1 yr of data from Fermi Area Telescope, we report probable emission in 0.03–1 TeV energy range. The results show that its spectrum can be well fitted a single power law with index 1.54 ± 0.17, and integral photon flux (4.28 1.03) × 10 −11 photons cm −2 s −1 . We also considered theoretically whether nonthermal could originate pulsar wind...
The light curves (LCs) and phase-averaged spectra of pulsed γ-ray emissions from three millisecond pulsars are studied in the striped wind model. In model, assumptions made: (i) photons mainly produced a finite region outside cylinder, (ii) relativistic electrons satisfy distribution power law with an exponential cut-off, (iii) inverse Compton process is main mechanism γ-rays production. Markov Chain Monte Carlo (MCMC) method used to look for best fits inclination angle view angle, which two...
Three gamma-ray millisecond pulsars (MSPs), PSR J1939+2134, J1959+2048, and J0034-0534, have been confirmed to a common feature of phase-aligned in radio bands. With geometric (two-pole caustic) model physical outer gap (revised 3D model) three dimensional (3D) retarded magnetic dipole with perturbation field, the observed features these MSPs are studied. In order obtained best-fitting parameters, Markov chain Monte Carlo technique is used reasonable GeV band light curves for given. Our...
ABSTRACT Pulsed γ-ray properties of 22 millisecond pulsars (MSPs) with double peaks are studied in the revised versions outer gap (OG) and stripped wind (SW) models. The major differences between these two models magnetic field structures, production sites, radiation mechanisms. In models, light curves MSPs calculated through a Markov chain Monte Carlo (MCMC) method to pick best-fitting model parameters. Our results indicate that (1) both can reproduce observed double-peak structures well,...
Motivated by the Fermi observations of some γ-ray pulsars in which phases radio and peaks are almost same, we investigate outer gap model a retarded dipole with current-induced magnetic field apply it to explain pulsed properties Crab pulsar. Our results show that observed energy-dependent light curves, align curve phase averaged spectrum for pulsar, reproduced well.
Trajectories and radiation of the accelerating electrons are studied in pulsar magnetosphere approximated as electromagnetic field Deutsch's solutions. Because accelerated rapidly to ultra-relativistic velocity near neutron star surface, electron vector (and then its trajectory) is derived from balance between Lorentz force reaction force, which makes pitch angle trajectories magnetic lines nonzero most part magnetosphere. In such a case, spectral energy distributions (SEDs)...