Multi-Band Light Curves from Two-Dimensional Simulations of Gamma-Ray Burst Afterglows

Details Multi-Band Light Curves from Two-Dimensional Simulations of Gamma-Ray Burst Afterglows Multi-Band Light Curves from Two-Dimensional Simulations of Gamma-Ray Burst Afterglows

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21520701m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #207.01; Bulletin of the American Astronomical Society, Vol. 42, p.310

Astronomy and Astrophysics

Astronomy

Scientific paper

The dynamics of gamma-ray burst outflows is inherently multi-dimensional. 1.) We present high resolution two-dimensional relativistic hydrodynamics simulations of GRBs in the afterglow phase using adaptive mesh refinement (AMR). Using standard synchrotron radiation models, we compute multi-band light curves, from the radio to X-ray, directly from the 2D hydrodynamics simulation data. We will present on-axis light curves for both constant density and wind media. We will also present off-axis light curves relevant for searches for orphan afterglows. We find that jet breaks are smoothed due to both off-axis viewing and wind media effects. 2.) Non-thermal radiation mechanisms in GRB afterglows require substantial magnetic field strengths. In turbulence driven by shear instabilities in relativistic magnetized gas, we demonstrate that magnetic field is naturally amplified to half a percent of the total energy (epsilon B = 0.005). We will show high resolution three dimensional relativistic MHD simulations of this process as well as particle in cell (PIC) simulations of mildly relativistic collisionless shocks.

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