EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 452/3 Article
Free access article

Issue A&A
Volume 452, Number 3, June IV 2006
Page(s) 743 - 749
Section Astrophysical processes
DOI http://dx.doi.org/10.1051/0004-6361:20035604



A&A 452, 743-749 (2006)
DOI: 10.1051/0004-6361:20035604

Channelled relativistic outflows in active galactic nuclei: analytic solutions for the evolution of particle spectra

C. Schuster1, I. Lerche1, 2, R. Schlickeiser1 and M. Pohl3

1  Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, Germany
    e-mail: rsch@tp4.rub.de
2  Institut für Geophysik und Geologie, Universität Leipzig, Germany
3  Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011

(Received 31 October 2003 / Accepted 4 November 2005)

Abstract
Context.Calculations of highly energetic neutrino and TeV $\gamma$-ray emission from relativistic jets of Active Galactic Nuclei (AGN) are often based on a model that involves a collimated relativistic blast wave, in which the spectral evolution of energetic particles is determined by the interplay between the particle injection by sweep up of the interstellar medium, energy losses by radiation and diffusive escape.
Aims.To date such models only have been solved numerically because of the highly non-linear nature of the time-dependent equations describing particle spectra and bulk energy loss. However it is difficult to see how parameters and groupings of parameters influence the resulting numerical solutions, except through intensive investigations of many numerical simulations. Therefore analytic solutions are particularly helpful.
Methods.We provide exact mathematical solutions to a very broad class of AGN type models. By selecting different functional behaviors of parameter values, we cover a large compendium of possible situations. The comparison of the exact solutions with observational information can help to improve our understanding of the evolution of individual AGN. Exact solutions can also be used to provide controls on the appropropriateness and accuracy of numerical programs used to solve the equations.
Results.We provide an analytical description of the evolution of proton spectra according to the pick-up model. We analyze the behavior of the particle spectra in the plasma frame. The solutions are determined by two competing processes: the deceleration of the jet plasmoid and particle cooling via radiation.


Key words: methods: analytical -- radiation mechanisms: non-thermal -- galaxies: jets -- galaxies: active -- plasmas -- gamma rays: theory



© ESO 2006


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.