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Modelling the TeV gamma-ray spectra of two low redshift AGNs: Mkn 501 and Mkn 421

MPS-Authors
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Konopelko,  A.
Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Kirk,  J. G.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Mastichiadis, A., Konopelko, A., Kirk, J. G., deJager, O. C., & Stecker, F. W. (2003). Modelling the TeV gamma-ray spectra of two low redshift AGNs: Mkn 501 and Mkn 421. Astrophysical Journal, 597(2), 851-859.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-80D2-8
Abstract
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.