Active galactic nuclei jets and multiple oblique shock acceleration: starved spectra

Author： Meli A.   Biermann P. L.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|556|issue|A88-A88

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.556, Iss.issue, 2013-08, pp. : A88-A88

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Context. Shocks in jets and hot spots of active galactic nuclei (AGN) are one prominent class of possible sources of very high-energy cosmic-ray particles (above 1018 eV). Extrapolating their spectrum to their plausible injection energy from some shock implies an enormous hidden energy for a spectrum of index ~−2. Some analyses suggest the particles’ injection spectrum at source to be as steep as −2.4 to −2.7, which exacerbates the problem, by a factor of 106. Nevertheless, it seems implausible that more than at the very best 1/3 of the jet energy goes into the required flux of energetic particles, thus one would need to allow for the possibility that there is an energy problem, which we would like to address in this work.

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