Acceleration mechanism in Blazar jets.

Details Acceleration mechanism in Blazar jets. Acceleration mechanism in Blazar jets.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.563m&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.563-566

Astronomy and Astrophysics

Astrophysics

1

Acceleration Of Particles, Galaxies: Active, Galaxies: Jets

Scientific paper

We present a model of a possible acceleration mechanism responsible for the heating of pair plasmas in Blazar jets. We focus on the effect of the anisotropic Inverse Compton (IC) cooling of pairs on soft photons coming from an accretion disk. We use a two flow configuration where the relativistic electron-positron beam in bulk motion is embedded in a subrelativistic electron-proton jet. The IC cooling will build up an anisotropic distribution and lead to the streaming of the pairs in the MHD medium. Consequently, plasma instabilities can be generated and heat the relativistic particles. In the inner parts of the jet the medium is optically thick to the pair production. As far as the relativistic particle population is densified two distinct regimes may appear. A first ``non relativistic'' regime where the MHD medium is energetically dominant and where both Langmuir and Alfven waves contribute to a stochastic acceleration of pairs. The solution of the stationary Fokker-Planck equation leads to a power-law distribution of the relativistic particle distribution with an index equals to 2. A second ``relativistic'' regime where the pair plasma is dense enough and where the ambient cold protons trigger a back streaming instability of the pair plasma Alfven waves. Even if the complete non-linear theory remains to be done, estimations of both bulk Lorentz factor and internal energy of the pair plasma are derived in term of the compactness of the source. This encouraging primilary work will be followed by a more complete description of these two regimes, including the effect of the pair creation and their annihilation.

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