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Centaurus A at Hard X-Rays and Soft Gamma-Rays

Published online by Cambridge University Press:  02 January 2013

H. Steinle
H. Steinle
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching,Germany. Email: [email protected]
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Abstract

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Cen A, at a distance of less than 4 Mpc, is the nearest radio-loud AGN. Its emission is detected from radio to very-high energy gamma-rays. Despite the fact that Cen A is one of the best studied extragalactic objects the origin of its hard X-ray and soft gamma-ray emission (100 keV <E< 50 MeV) is still uncertain. Observations with high spatial resolution in the adjacent soft X-ray and hard gamma-ray regimes suggest that several distinct components such as a Seyfert-like nucleus, relativistic jets, and even luminous X-ray binaries within Cen A may contribute to the total emission in the MeV regime that has been detected with low spatial resolution. As the Spectral Energy Distribution of Cen A has its second maximum around 1 MeV, this energy range plays an important role in modeling the emission of (this) AGN. As there will be no satellite mission in the near future that will cover this energies with higher spatial resolution and better sensitivity, an overview of all existing hard X-ray and soft gamma-ray measurements of Cen A is presented here defining the present knowledge on Cen A in the MeV energy range.

Keywords

galaxies: individual (NGC 5128, Centaurus A)X-rays: galaxiesgamma rays: observations
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 27 , Special Issue 4: The Many Faces of Centaurus A , 2010 , pp. 431 - 438
Copyright
Copyright © Astronomical Society of Australia 2010

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