半人马座A核心发射的Gamma-ray通量：一个难题得到解决
Gamma-ray fluxes from the core emission of Centaurus A: A puzzle solved
摘要：
在分析了四年的费米数据后，报告了射电星系半人马座A中的高能成分。该分量的光谱通过具有4 GeV的断裂能量的断裂幂律来描述，并且在以下和以上光谱指数分别为$α_1$ =2.74 $\pm$ 0.03和$α_2$ =2.09 $\pm$ 0.20。H.E.S.S.还探测到TeV能量的微弱$γ$射线通量。在本文中，我们表明，在GeV-TeV能量的光谱描述通过同步自康普顿发射到几个GeV（$\sim$ 4 GeV）和$π^0$衰变产物到TeV的能量，虽然由μ子的同步辐射的发射可能有助于在GeV能量的光谱，如果他们迅速加速。康普顿γ射线天文台报道了加速质子与两种粒子群的种子光子相互作用产生μ子和$π^0$，一种粒子群处于中间态发射，能量峰值为0.15 MeV，另一种粒子群处于低能态发射，能量峰值为0.59 MeV。此外，我们还证明了超高能宇宙射线的观测和半人马座A附近非高能中微子的探测可以通过这些相互作用来解释，假设质子谱扩展到超高能。
英文摘要：
A high-energy component in the radio galaxy Centaurus A was reported after analyzing four years of Fermi data. The spectrum of this component is described by means of a broken power law with a break energy of 4 GeV and, below and above spectral indices of $α_1$=2.74$\pm$0.03 and $α_2$=2.09$\pm$0.20, respectively. Also a faint $γ$-ray flux at TeV energies was detected by H.E.S.S.. In this paper we show that the spectrum at GeV-TeV energies is described through synchrotron self-Compton emission up to a few GeV ($\sim$ 4 GeV) and $π^0$ decay products up to TeV energies, although the emission of synchrotron radiation by muons could contribute to the spectrum at GeV energies, if they are rapidly accelerated. Muons and $π^0$s are generated in the interactions of accelerated protons with two populations of seed photons which were reported by Compton Gamma-Ray Observatory: one population at intermediate state emission with energy peak of 0.15 MeV and another at low state emission with energy peak of 0.59 MeV. In addition, we show that the reported observations of ultra-high-energy cosmic rays and non high-energy neutrino detection around Centaurus A can be explained through these interactions, assuming that proton spectrum is extended up to ultra-high-energies.
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