Hard X-ray observation of Centaurus A

Details Hard X-ray observation of Centaurus A Hard X-ray observation of Centaurus A

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..105u&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 105-108.

Astronomy and Astrophysics

Astronomy

4

Active Galactic Nuclei, X Ray Astronomy, X Ray Sources, Astronomical Models, Emission Spectra, Radio Emission, X Ray Spectra

Scientific paper

The nearby active-nucleus galaxy Centaurus A was observed on May 17, 1989 with the POKER experiment in the energy range 15-150 keV. During the observation the source was in a low emission state at an average intensity of 2.25 x 10 exp -4/ph sq cm s keV at 30 keV and showed a quite hard spectrum compatible with a power law fit with a spectral slope of alpha = 1.60. Our data confirm the scenario suggesting Cen A to be one of the strongly variable high energy emitters with intensity variability of one order of magnitude or more. Nevertheless, our spectral measurement, collected during a quiescent state, confirms the presence of a quite constant spectral slope, with a 'canonical' value of about 1.6 in photon index, in good agreement with the radio emission. Finally our data set supports the hypothesis that the same emission mechanism is responsible for the power law emission in the radio and hard X-rays wavelengths, confirming SSC models.

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