Models of variability in blazar jets

Details Models of variability in blazar jets Models of variability in blazar jets

1999-03-18

arxiv.org/abs/astro-ph/9903280v1

Astronomy and Astrophysics

Astrophysics

12 pages, 6 figures. To appear in "Frontier objects in astrophysics", (Vulcano workshop 1998) eds F. Giovanelli, G. Mannocchi

Scientific paper

We present the expected variability features in the context of the Synchro- Self-Compton (SSC) model of emission from Active Galactic Nuclei (AGNs) and show that the homogeneous SSC model describes well the observed multi- wavelength spectrum and variability of objects such as Mkn 421 and Mkn 501; however in order to explain the very fast flaring timescales occasionally observed from these objects one should use a laminar, rather than spherical, source geometry. This picture leads naturally to a shock-in- jet model which we approach as a site of diffusive particle acceleration. We show that this acceleration scheme can explain certain characteristic features of AGN X-ray spectra and provides us with further observational tests.

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