Non-thermal pair model for the radio-galaxy Centaurus A

Details Non-thermal pair model for the radio-galaxy Centaurus A Non-thermal pair model for the radio-galaxy Centaurus A

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...331l..57m&link_type=abstract

Astronomy and Astrophysics, v.331, p.L57-L60 (1998)

Astronomy and Astrophysics

Astrophysics

13

Galaxies: Active, Galaxies: Individual Cen A, Radiation Mechanisms: Nonthermal, Gamma-Rays: Theory

Scientific paper

In this letter we consider the production of hard X-ray spectrum of the radio galaxy Centaurus A by a relativistic electron-positron beam scattering soft photons coming from an accretion disk. The spectral break of order of 0.7 observed at ~ 120 keV in the 1991 high emission state is explained by gamma -gamma absorption of soft gamma-ray photons. The misaligned nature of the relativistic jet explains a redshifted spectral break with regard to pair creation energy threshold. We fit the data with a jet direction making an angle of 80 degr with the line of sight. We also consider lower Thomson optical depth solutions, and we apply them to the 1992-1994 low state of activity of the source.

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