PULSED HIGH-ENERGY EMISSION AND PHASE-RESOLVED SPECTRA BY INVERSE COMPTON SCATTERING IN A PULSAR STRIPED WIND

2008 ◽  
Vol 17 (10) ◽  
pp. 1969-1976
Author(s):  
JÉRÔME PÉTRI ◽  
JOHN G. KIRK
Keyword(s):  
Gamma Ray ◽  
Direct Consequence ◽  
High Energy ◽  
Light Curves ◽  
Inverse Compton Scattering ◽  
Energy Emission ◽  
Inverse Compton ◽  
Pulse Structure ◽  
And Behavior ◽  
High Energy Emission

To date, seven gamma-ray pulsars are known, showing pulsed emission up to tens of GeV and associated light-curves with a double-pulse structure. We study this pulsed high-energy emission in the framework of the striped wind model. By numerical integration of the time-dependent emissivity in the current sheets, we compute the phase-dependent spectral variability of the inverse Compton radiation. Several light curves and spectra are presented. The pulses are a direct consequence of relativistic beaming. Our model is able to explain some of the high-energy (10 MeV–10 GeV) spectral features and behavior of several gamma-ray pulsars, such as Geminga and Vela.

scholarly journals Clustering of LAT light curves: a clue to the origin of high-energy emission in gamma-ray bursts

2014 ◽  
Vol 443 (4) ◽  
pp. 3578-3585 ◽  
Author(s):  
L. Nava ◽  
G. Vianello ◽  
N. Omodei ◽  
G. Ghisellini ◽  
G. Ghirlanda ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Energy Emission ◽  
High Energy Emission

scholarly journals MODELS FOR GAMMA-RAY PRODUCTION IN LOW-MASS MICROQUASARS

2008 ◽  
Vol 17 (10) ◽  
pp. 1903-1908 ◽  
Author(s):  
G. S. VILA ◽  
G. E. ROMERO
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
High Mass ◽  
Energy Emission ◽  
High Energy Tail ◽  
Inverse Compton ◽  
External Sources ◽  
Low Mass ◽  
High Energy Emission ◽  
Relativistic Particles

Unlike high-mass gamma-ray binaries, low-mass microquasars lack external sources of radiation and matter that could produce high-energy emission through interactions with relativistic particles. In this work, we consider the synchrotron emission of protons and leptons that populate the jet of a low-mass microquasar. In our model photohadronic and inverse Compton (IC) interactions with synchrotron photons produced by both protons and leptons result in a high-energy tail of the spectrum. We also estimate the contribution from secondary pairs injected through photopair production. The high-energy emission is dominated by radiation of hadronic origin, so we can call these objects "proton microquasars".

Into the Belly of the Beast

2011 ◽  
Author(s):  
Joshua S. Bloom
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Common Elements ◽  
Physical Processes ◽  
Energy Emission ◽  
Central Engine ◽  
High Energy Emission

This chapter discusses the definition, emission, and central engine of gamma-ray bursts (GRBs). Before the afterglow era, GRBs were essentially defined by observations of their high-energy emission. The landscape of such observations—the light curves and spectra of the events—exhibits at once great diversity and elements of commonality that bind different events together. GRBs are like fingerprints: no two are alike, but they share common properties. Those common elements provide strong constraints both on the nature of the “engine” that supplies the energy to the event and the physical processes that drive the emission we see. Since the 1990s, GRB monitors in space have observed more than one hundred GRBs. Since 2004, the NASA GRB satellite called Swift has been discovering GRBs at a rate of about two per week.

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.

scholarly journals HIGH-ENERGY EMISSION OF GRB 130427A: EVIDENCE FOR INVERSE COMPTON RADIATION

2013 ◽  
Vol 776 (2) ◽  
pp. 95 ◽  
Author(s):  
Yi-Zhong Fan ◽  
P. H. T. Tam ◽  
Fu-Wen Zhang ◽  
Yun-Feng Liang ◽  
Hao-Ning He ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Emission ◽  
Inverse Compton ◽  
High Energy Emission

scholarly journals CONSTRAINING THE HIGH-ENERGY EMISSION FROM GAMMA-RAY BURSTS WITHFERMI

2012 ◽  
Vol 754 (2) ◽  
pp. 121 ◽  
Author(s):  
◽  
M. Ackermann ◽  
M. Ajello ◽  
L. Baldini ◽  
G. Barbiellini ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Energy Emission ◽  
High Energy Emission

scholarly journals Upper limits on the high-energy emission from gamma-ray bursts observed by AGILE-GRID

2012 ◽  
Vol 547 ◽  
pp. A95 ◽  
Author(s):  
F. Longo ◽  
E. Moretti ◽  
L. Nava ◽  
R. Desiante ◽  
M. Olivo ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Energy Emission ◽  
Upper Limits ◽  
High Energy Emission
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