The effect of expansion on high-energy emission from AGN jets

Details The effect of expansion on high-energy emission from AGN jets The effect of expansion on high-energy emission from AGN jets

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..921..150p&link_type=abstract

THE FIRST GLAST SYMPOSIUM. AIP Conference Proceedings, Volume 921, pp. 150-152 (2007).

Physics

Active And Peculiar Galaxies And Related Systems, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We present a detailed study of the impact of jet expansion on the emission properties of blazars, in particular their lightcurves, based on the notion that the radiation is produced in an emission zone that is travelling down the jet. Using analytical estimates and numerical studies with a particular model of particle energization, we conclude that AGN jets must be very well collimated with opening angles smaller than about 1 mrad, if the emission seen over a few days is caused by an emission zone that travels down the jet. Our preliminary findings based on TeV-band lightcurves suggest that either this condition is not met or an unknown very efficient mechanism collimates the jets of AGN. GLAST will provide well-sampled blazar lightcurves that permit a more accurate statistical analysis.

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