Magnetic field reconnection and high-energy emission from accreting neutron stars

1993 ◽  
Author(s):  
Marco Tavani ◽  
Edison Liang
Keyword(s):  
Magnetic Field ◽  
Neutron Stars ◽  
High Energy ◽  
Energy Emission ◽  
High Energy Emission

scholarly journals Observational Manifestations of Young Neutron Stars: Spin-powered Pulsars

2004 ◽  
Vol 218 ◽  
pp. 13-20 ◽  
Author(s):  
Michael Kramer
Keyword(s):  
Neutron Stars ◽  
Gamma Ray ◽  
High Energy ◽  
Electromagnetic Spectrum ◽  
Crab Pulsar ◽  
Pulsar Emission ◽  
Energy Emission ◽  
Radio Frequencies ◽  
High Energy Emission

The largest number of known young neutron stars axe observed as spin-powered pulsars. While the majority of those are detected at radio frequencies, an increasing number can be studied in other parts of the electromagnetic spectrum as well. The Crab pulsar is the prototype of a young pulsar which can be observed from radio to gamma-ray frequencies, providing a red thread of discussion during a tour through the pulsar properties observed across the electromagnetic spectrum. The basic observational features of pulsar emission are presented, preparing the ground for more detailed reviews given in these proceedings. Here, particular attention will be paid to those emission features which may provide a link between the radio and high-energy emission processes.

scholarly journals The high-energy emission from HD 93129A near periastron

2020 ◽  
Vol 494 (4) ◽  
pp. 6043-6052
Author(s):  
S del Palacio ◽  
F García ◽  
D Altamirano ◽  
R H Barbá ◽  
V Bosch-Ramon ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Energy ◽  
X Ray ◽  
Energy Emission ◽  
Collision Region ◽  
Upper Limits ◽  
The Galaxy ◽  
Radiative Model ◽  
Γ Ray ◽  
High Energy Emission

ABSTRACT We conducted an observational campaign towards one of the most massive and luminous colliding wind binaries in the Galaxy, HD 93129A, close to its periastron passage in 2018. During this time the source was predicted to be in its maximum of high-energy emission. Here we present our data analysis from the X-ray satellites Chandra and NuSTAR and the γ-ray satellite AGILE. High-energy emission coincident with HD 93129A was detected in the X-ray band up to ∼18 keV, whereas in the γ-ray band only upper limits were obtained. We interpret the derived fluxes using a non-thermal radiative model for the wind-collision region. We establish a conservative upper limit for the fraction of the wind kinetic power that is converted into relativistic electron acceleration, fNT,e < 0.02. In addition, we set a lower limit for the magnetic field in the wind-collision region as BWCR > 0.3 G. We also argue a putative interpretation of the emission from which we estimate fNT,e ≈ 0.006 and BWCR ≈ 0.5 G. We conclude that multiwavelength, dedicated observing campaigns during carefully selected epochs are a powerful tool for characterizing the relativistic particle content and magnetic field intensity in colliding wind binaries.

THE HIGH ENERGY EMISSION MORPHOLOGIES AND PHASE-RESOLVED SPECTRA OF PULSARS

2001 ◽  
Vol 16 (29) ◽  
pp. 4659-4712
Author(s):  
K. S. CHENG ◽  
S. F. KO ◽  
H. Y. LIE ◽  
L. ZHANG
Keyword(s):  
Magnetic Field ◽  
Three Dimensional ◽  
Rotation Period ◽  
High Energy ◽  
Radius Of Curvature ◽  
Photon Density ◽  
Stellar Rotation ◽  
Nonthermal Radiation ◽  
Energy Emission ◽  
High Energy Emission

There has been much progress in detecting and understanding high-energy (~1 keV–10 GeV) radiation from rotation powered pulsars. Strong evidence indicates that the nonthermal radiation is emitted from the outer magnetosphere. The local properties in the magnetosphere, e.g. retarded relativistic effect, the strength of the magnetic field, radius of curvature, soft photon density, time of flight for photons etc., make the observed light curves and spectra of high energy radiation from pulsars not only depend on pulsar parameters, i.e. the stellar rotation period and the dipole magnetic field, but also depend on the inclination angle and the view angle. Three-dimensional outer magnetospheric models must be used to understand the complicated observed high energy emission morphologies and phase-dependent spectra of pulsars. Some basic properties of pulsars, recent observed results and other pulsar related phenomena are also reviewed.

scholarly journals Magnetars: the explosive character of a small class of strongly magnetized neutron stars

2013 ◽  
Vol 9 (S302) ◽  
pp. 429-434
Author(s):  
Nanda Rea
Keyword(s):  
Neutron Stars ◽  
Current Knowledge ◽  
High Energy ◽  
Small Sample ◽  
Small Class ◽  
Energy Emission ◽  
Crucial Information ◽  
High Energy Emission ◽  
The Universe

AbstractI will review our current knowledge on the most magnetic objects in the Universe, a small sample of neutron stars called magnetars. The powerful persistent high energy emission and the flares from these strongly magnetized (1015 Gauss) neutron stars are providing crucial information about the physics involved at these extremes conditions, reserving us many unexpected surprises.

scholarly journals Gamma-ray pulsar light curves as probes of magnetospheric structure

2016 ◽  
Vol 82 (3) ◽  
Author(s):  
A. K. Harding
Keyword(s):  
Magnetic Field ◽  
Gamma Ray ◽  
High Energy ◽  
Field Structure ◽  
Light Curves ◽  
Pulsar Magnetosphere ◽  
Magnetic Field Structure ◽  
Energy Emission ◽  
Emission Models ◽  
High Energy Emission

The large number of ${\it\gamma}$-ray pulsars discovered by the Fermi Gamma-Ray Space Telescope since its launch in 2008 dwarfs the handful that were previously known. The variety of observed light curves makes possible a tomography of both the ensemble-averaged field structure and the high-energy emission regions of a pulsar magnetosphere. Fitting the ${\it\gamma}$-ray pulsar light curves with model magnetospheres and emission models has revealed that most of the high-energy emission, and the particles acceleration, takes place near or beyond the light cylinder, near the current sheet. As pulsar magnetosphere models become more sophisticated, it is possible to probe magnetic field structure and emission that are self-consistently determined. Light curve modelling will continue to be a powerful tool for constraining the pulsar magnetosphere physics.

High‐Energy Emission from the TeV Blazar Markarian 501 during Multiwavelength Observations in 1996

1999 ◽  
Vol 514 (1) ◽  
pp. 138-147 ◽  
Author(s):  
J. Kataoka ◽  
J. R. Mattox ◽  
J. Quinn ◽  
H. Kubo ◽  
F. Makino ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Emission ◽  
High Energy Emission ◽  
Multiwavelength Observations
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