Radiation from Relativistic Poynting Jets and Collisionless Shocks

Details Radiation from Relativistic Poynting Jets and Collisionless Shocks Radiation from Relativistic Poynting Jets and Collisionless Shocks

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922305l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #223.05; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present PIC simulation results of radiation from particles accelerated by Poynting jets (electromagnetic-dominated directed outflows) and relativistic collisionless shocks, both popular paradigms for gamma-ray burst (GRB) prompt emissions. We show how the radiation power output, polarization, and spectra depend on the ejecta Lorentz factor, magnetic field, ion loading and density contrast between ejecta and upstream matter. We find that in all cases the intrinsic radiation output of the highest energy particles is many orders of magnitude below that of classical synchrotron radiation because these particles are accelerated to first order by forces parallel, not perpendicular, to their momentum. We also show results for inverse Comptonization of blackbody soft photons, and discuss their implications for interpreting GRB light curves and spectra.

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