Journal Article

Modelling rapid TeV variability of PKS 2155−304

K. Katarzyński, J.-P. Lenain, A. Zech, C. Boisson and H. Sol

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 390, issue 1, pages 371-376
Published in print October 2008 | ISSN: 0035-8711
Published online October 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13753.x
Modelling rapid TeV variability of PKS 2155−304

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We present theoretical modelling for the very rapid TeV variability of PKS 2155−304 observed recently by the High Energy Spectroscopic System (HESS) experiment. To explain the light curve, where at least five flaring events were well observed, we assume five independent components of a jet that are characterized by slightly different physical parameters. An additional, significantly larger component is used to explain the emission of the source at long time-scales. This component dominates the emission in the X-ray range, whereas the other components are dominant in the TeV range. The model used for our simulation describes precisely the evolution of the particle energy spectrum inside each component and takes into account light travel time effects. We show that a relatively simple synchrotron self-Compton scenario may explain this very rapid variability. Moreover, we find that absorption of the TeV emission inside the components due to the pair creation process is negligible.

Keywords: radiative transfer; BL Lacertae objects: individual: PKS 2155−304

Journal Article.  4944 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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