Probing The Shock Environs In Blazars and Gamma-Ray Bursts using the Fermi GST

Details Probing The Shock Environs In Blazars and Gamma-Ray Bursts using the Fermi GST Probing The Shock Environs In Blazars and Gamma-Ray Bursts using the Fermi GST

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3308b&link_type=abstract

American Astronomical Society, HEAD meeting #11, #33.08; Bulletin of the American Astronomical Society, Vol. 41, p.706

Astronomy and Astrophysics

Astronomy

Scientific paper

A developing Fermi legacy for gamma-ray burst and blazar science is the ability of the LAT to pin down the power-law index of the high energy portion of emission in these sources, and therefore also the index of the underlying non-thermal particle population. This provides, for the first time, clean diagnostics on the shock acceleration environment in the jets/outflows in these extragalactic sources. This paper highlights how such broadband Fermi spectra can be used to probe diffusive acceleration in relativistic, oblique, MHD shocks in bursts and blazars. The key characteristics of relativistic shock acceleration are outlined, using both Monte Carlo simulation techniques and analytic solutions of the diffusion-convection equation, in both subluminal and superluminal regimes. These include a discussion of an interesting regime of flat distribution generation due to shock drift acceleration that is potentially quite pertinent to flat spectrum blazars. Injection efficiencies into the acceleration process are also addressed. Informative constraints on the frequency of particle scattering and the level of field turbulence, important environmental quantities for relativistic shock studies, are identified using the Fermi observations of selected energetic blazars such as PKS 2155-304 and Mrk 421 with TeV-band detections, and bursts GRB 080916c and GRB 090510.

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