Geodesic
On the origin of high energy $\gamma$-rays from giant radio lobes of Centaurus~A
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2012), pp. 62-66

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Recently the Fermi LAT collaboration reported on the detection of high energy $\gamma$-ray signal from giant lobes of the radio galaxy Centaurus A. It is shown that if the $\gamma$-rays had originated from the inverse-Compton scattering of cosmic microwave background photons for the equipartition magnetic field of 2 $\mu G$, the Fermi LAT would not detect $\gamma$-rays from the lobes of Centaurus A. However, the detected $\gamma$-rays may be produced in hadronic interactions, namely in interactions of high energy protons with low density plasma followed with the production of pions, the neutral component decaying into $2 \gamma$-quanta. In this article we study the hadronic origin of $\gamma$-rays, and estimate the total energy of protons assuming a power-law proton distribution with an exponential cut-off.
Keywords: Centaurus A, gamma-rays, radio galaxy lobes. 
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N. V. Sahakyan. On the origin of high energy $\gamma$-rays from giant radio lobes of  Centaurus~A. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2012), pp. 62-66. http://geodesic.mathdoc.fr/item/UZERU_2012_2_a9/