AAS 207th Meeting, 8-12 January 2006
Session 151 GRB: Theory, X-rays, and Catalogs
Oral, Wednesday, 10:00-11:30am, January 11, 2006, Wilson A/B

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[151.02] Compton Spectrum from Poynting Flux Accelerated e+e- Plasma.

S Sugiyama (Rice University), Edison Liang Collaboration, Koichi Noguchi Collaboration, Hideaki Takabe Collaboration

We report the Compton scattering emission from the Poynting flux acceleration of electron-positron plasma simulated by the 2 1/2 dimensional particle-in-cell(PIC) code. We study the intense electromagnetic pulse loaded with e+-e- plasma interacting with ambient blackbody soft photons. Driven by the strong electromagnetic field, the particles can be accelerated to ultrarelativistic energies with a power-low momentum distribution, resulting in the development of a power-low spectrum of photons via Compton scattering, (photon index is roughly -1.5-2.5). This is consistent with the Gamma-ray, X-ray power-law spectrum from the long duration GRBs. The emission has also strong angle dependence: the emission from 3-8 degree from the Poynting flux direction is harder than from the other angles. We will show these and other remarkable properties of Poynting flux acceleration and Compton spectral output, and discuss the agreement with the observed properties of GRBs and XRFs.

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