We present a one-zone homogeneous lepton-hadronic model and obtain steady-state spectra by solving the time-dependent equations to study a plausible origin of hard TeV spectra in PKS 2155–304. In this model, we assume a steady electron and proton injection rate in the source and solve the non-linear time-dependent kinematic equations that self-consistently consist of proton-photon interaction, synchrotron radiation of electron/positron pairs and proton, inverse Compton scattering, and synchrotron self-absorption. We employ this model to reproduce the multi-wavelength spectrum of PKS 2155–304, then find that the possible bump located at E ∼ 1 TeV which may originate from the synchrotron radiation of secondary electrons produced by Bethe-Heitler pair production, resulting in the hard TeV spectrum.

我们提出了一个单区均匀轻子-强子模型，并通过求解时间相关方程获得稳态光谱，以研究 PKS 2155-304 中硬 TeV 光谱的合理起源。在这个模型中，我们假设源中的电子和质子注入速率稳定，并求解非线性的时间相关运动学方程，该方程自洽地由质子-光子相互作用、电子/正电子对和质子的同步辐射、逆康普顿组成散射和同步加速器自吸收。我们利用该模型再现了 PKS 2155-304 的多波长光谱，然后发现可能位于E ∼ 1 TeV 的凸块可能源于 Bethe-Heitler 对产生的二次电子的同步辐射，导致硬 TeV 谱。