On the primary energy distribution and the EBL limits from TeV Blazars

Details On the primary energy distribution and the EBL limits from TeV Blazars On the primary energy distribution and the EBL limits from TeV Blazars

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..506m&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc

Astronomy and Astrophysics

Astronomy

Quasars, Particle Acceleration, Planetary Bow Shocks, Interplanetary Shocks

Scientific paper

Knowledge of the acceleration of charged particles in astrophysical shock waves and their consequent emission is crucial on testing the astroparticle physical conditions occurring in environments such as Blazars. In the present work, we discuss how the variation of the primary energy spectral index of accelerated electrons, which may occur in mild or extreme relativistic shocks of Blazars, may consequently affect the limits of the extragalactic absorption models. While in the past the electron spectrum was traditionally assumed to follow an E-2 spectrum below the cooling break energy, our and other recent models of diffusive acceleration result in energy spectra with varying spectral indexes such as E-1.0 up to E-2.5, which pose critical physical constraints. In this work, we re-examine the limit on the extragalactic background light (EBL) set by the H.E.S.S. While the latter assumed that electron spectra cannot be flatter than dN/dE~E-1.5, here we give a relaxed limit on the EBL by allowing for spectra as flat as E-1.0 corresponding to more specific shock parameters, in contrast to previous works.

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