Nonthermal Properties of Relativistic Jets in Blazars

Details Nonthermal Properties of Relativistic Jets in Blazars Nonthermal Properties of Relativistic Jets in Blazars

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085...50m&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, Gamma-Ray, Quasars, Active Or Peculiar Galaxies, Objects, And Systems, Galactic Nuclei, Circumnuclear Matter, And Bulges

Scientific paper

We discuss the non thermal properties of blazars in a unification perspective. The different spectral energy distributions (SED) from the IR to X-ray and GeV and TeV gamma-rays can be understood on the basis of rather simple radiation mechanisms involving a single population of high energy electrons and occurring in a region with bulk Lorentz factor of order 10. This accounts also for the main correlations observed between optical, X-ray and gamma-ray intensities in the best monitored objects. The radio emission from the former region is strongly sel-fabsorbed. The observed delays of radio flares with respect to optical flares confirm this picture. Fast variability is difficult to account unless extremely high Lorentz factors are invoked, possibly concerning only parts of a structured jet.
The overall regularities of the SEDs with the double peaks shifting to higher energies with decreasing jet powers are confirmed by new data. High power jets are associated with optically thick accretion disks providing seeds for external Compton scattering and strong radiative cooling of the electrons. Low power jets propagate in a cleaner ambient allowing higher energies to be reached by the electron population and radiate mainly via synchrotron self-Compton. All these properties may ultimately correspond to a decreasing level of fueling of the central black hole.

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