Modelling the variability of 1ES1218+30.4

Abstract

The blazar 1ES1218+30.4 has been previously detected by the VERITAS and MAGIC telescopes in the very high energies. The new detection of VERITAS from December 2008 to April 2009 proves that 1ES1218+30.4 is not static, but shows short-time variability. We show that the time variability may be explained in the context of a self-consistent synchrotron-self Compton model, while the long time observation do not necessarily require a time-resolved treatment. The kinetic equations for electrons and photons in a plasma blob are solved numerically including Fermi acceleration for electrons as well as synchrotron radiation and Compton scattering. The light curve observed by VERITAS can be reproduced in our model by assuming a changing level of electron injection compared to the constant state of 1ES1218+30.4. The multiwavelength behaviour during an outburst becomes comprehensible by the model. The long time measurements of VERITAS are still explainable via a constant emission in the SSC context, but the short outbursts each require a time-resolved treatment.

4 pages, 3 figures; accepted in A&A; AA/2010/14299

References in corpus (8)

• Fermi observations of TeV-selected AGN
• Six years of BeppoSAX observations of blazars: a spectral catalog
• Discovery of VHE gamma-ray emission from 1ES1218+30.4
• SWIFT observations of TeV BL Lac objects
• Discovery of Variability in the Very High Energy Gamma-Ray Emission of 1ES 1218+304 with VERITAS
• Synchrotron and Synchrotron Self-Compton Spectral Signatures and Blazar Emission Models
• Spectral modelling of 1 ES 1218+30.4
• Modelling the steady state spectral energy distribution of the BL-Lac Object PKS 2155-304 using a selfconsistent SSC model

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