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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents



ID: 56179.0, MPI für Kernphysik / High-Energy Astrophysics
Modelling the TeV gamma-ray spectra of two low redshift AGNs: Mkn 501 and Mkn 421.
Authors:Konopelko, A.; Mastichiadis, A.; Kirk, J.G.; de Jager, O.C.; Stecker, F.W.
Language:English
Date of Publication (YYYY-MM-DD):2003-11-10
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Volume:597
Issue / Number:2, Part 1
Start Page:851
End Page:859
Copyright:The American Astronomical Society. All rights reserved
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We discuss the results of modeling the TeV γ-ray spectra of two active galactic nuclei, Mrk 501 and Mrk 421, that have almost the same redshifts: z = 0.031 and 0.034, respectively. The effect of intergalactic γ-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 characterized by higher values of the Doppler factor (δ ≥ 50) and an electron injection spectrum extending to higher energies (γmax ≥ 1.5 × 105). In the case of Mrk 421, the observed difference in spectral slope in X-rays and TeV γ-rays between the high and low states can be explained as a variation of a single parameter—the maximum energy γmaxmc2 at which electrons are injected.
Free Keywords:BL Lacertae objects: individual (Markarian 421, Markarian 501)—galaxies: active—gamma rays: observations
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
External Affiliations:Department of Physics, University of Athens, Panepistimiopolis, GR 15783 Athens, Zografos, Greece
Unit for Space Physics, Potchefstroom University, Potchefstroom 2520, South Africa
NASA Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Code 662, Greenbelt, MD 20771
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