Gamma Rays from Centaurus A

Abstract

Centaurus A, the cosmic ray accelerator a few Mpc away from us is possibly one of the nearest sources of extremely high energy cosmic rays. We investigate whether the gamma ray data currently available from Centaurus A in the GeV-TeV energy band can be explained with only proton proton interactions. We show that for a single power law proton spectrum, mechanisms of $\gamma$-ray production other than proton proton interactions are needed inside this radio-galaxy to explain the gamma ray flux observed by EGRET, upper limits by H.E.S.S./CANGAROO-III and the correlated extremely energetic cosmic ray events observed by the Pierre Auger experiment. In future with better $\gamma$-ray data, simultaneous observation with $\gamma$-ray and cosmic ray detectors, it would be possible to carry out such studies on different sources in more detail.

7 pages, JCAP in press

References in corpus (3)

• Observations of Selected AGN with H.E.S.S
• Corrected Table for the Parametric Coefficients for the Optical Depth of the Universe to Gamma-rays at Various Redshifts
• TeV gamma-rays from photo-disintegration/de-excitation of cosmic-ray nuclei

Cited by in corpus (1)

• Ultra High Energy Cosmic Rays from Black Hole Jets of Radio Galaxies