One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays

Details One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays

1998-11-19

arxiv.org/abs/astro-ph/9811301v1

Astronomy and Astrophysics

Astrophysics

4 pages. Accepted for publication in Astronomy & Astrophysics Letters

Scientific paper

The Circinus Galaxy has been observed, for the first time above 10 keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1--10 keV spectrum is apparent in the PDS data. The most likely explanation is that we are observing the nucleus through a column density of about 4x10**24 cm-2, i.e. large enough to completely block the radiation below 10 keV but small enough to permit partial transmission above this energy.

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