The new model of fitting the spectral energy distributions of Mkn 421 and Mkn 501

TL;DR

This paper introduces a new multi-zone model for fitting the spectral energy distributions of TeV blazars Mkn 421 and Mkn 501, addressing limitations of the traditional one-zone SSC model by incorporating proton acceleration and different emission regions.

Contribution

The paper proposes a novel multi-zone model that better fits the SEDs of blazars by separating low and high energy emissions and relaxing Doppler factor constraints.

Findings

Successful fitting of Mkn 501 SED in April 1997

Successful fitting of Mkn 421 SED in March 2001

Addresses high energy tail fitting issues of previous models

Abstract

The spectral energy distribution (SED) of TeV blazars has a double-humped shape that is usually interpreted as Synchrotron Self Compton (SSC) model. The one zone SSC model is used broadly but cannot fit the high energy tail of SED very well. It need bulk Lorentz factor which is conflict with the observation. Furthermore one zone SSC model can not explain the entire spectrum. In the paper, we propose a new model that the high energy emission is produced by the accelerated protons in the blob with a small size and high magnetic field, the low energy radiation comes from the electrons in the expanded blob. Because the high and low energy photons are not produced at the same time, the requirement of large Doppler factor from pair production is relaxed. We present the fitting results of the SEDs for Mkn 501 during April 1997 and Mkn 421 during March 2001 respectively.