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          Institute: MPI für Kernphysik     Collection: Theoretical Astrophysics     Display Documents

ID: 43783.0, MPI für Kernphysik / Theoretical Astrophysics
Modelling the TeV gamma-ray spectra of two low redshift AGNs: Mkn 501 and Mkn 421
Authors:Mastichiadis, A.; Konopelko, A.; Kirk, J. G.; deJager, O. C.; Stecker, F. W.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Astrophysical Journal
Issue / Number:2
Start Page:851
End Page:859
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We discuss the results of modelling the TeV gamma-ray spectra of two AGNs, Mkn 501 and Mkn 421 that have almost the same redshifts: z=0.031 and z=0.034, respectively. The effect of intergalactic gamma-ray absorption is treated as an uncertainty in the measurement of the intrinsic spectrum. Although the objects differ, we obtain satisfactory fits for both of them in a synchrotron self-Compton scenario. Compared to previous models, our fits are characterised by higher values of the Doppler factor (>= 50) and an electron injection spectrum extending to higher energies (Gmax = 1.5x10^5). In the case of Mkn 421, the observed difference in spectral slope in X-rays and TeV gamma-rays between the high and low states can be explained as a variation of a single parameter - the maximum energy Gmax mc^2 at which electrons are injected.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group H. J. Völk/Theoretical Astrophysics (F. Aharonian, J. Kirk)
External Affiliations:(2) Department of Physics, University of Athens, Panepistimiopolis, GR 15783,
Zografos, Greece, Unit for Space Physics, Potchefstroom University, 2520, South Africa
Laboratory of High Energy Astrophysics, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
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