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Rapid Variability of Gamma-Ray Blazars

Published online by Cambridge University Press:  14 August 2015

M. Salvati ,
M. Spada  and
F. Pacini
M. Salvati
Affiliation:
Osservatorio Astrofisico di Arcetri L. E. Fermi 5 1-50125 Firenze Italy
M. Spada
Affiliation:
Dipartimento di Astronomia e Scienza dello Spazio Università di Firenze L. E. Fermi 5 1-50125 Firenze Italy
F. Pacini
Affiliation:
Osservatorio Astrofisico di Arcetri and Dipartimento di Astronomia e Scienza dello Spazio L. E. Fermi 5 1-50125 Firenze Italy

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This paper is devoted to a discussion of the rapid variability observed in γ-ray blazars. We do this in the framework of a widely accepted scenario, according to which the blazar emission arises from a jet, i.e. a continuous flow of relativistic fluid, with perturbations occasionally superimposed. The jet is assumed to have a bulk Lorentz factor Γ ≫ 1, and length z and radius r such that r ã z/Γ.

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