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

G. Matt, M. G. Uainazzi, R. Maiolino, S. Molendi, G. C. Perola, L. A. Antonelli, L. Bassani, W. N. Brandt, A. C. Fabian, F. Fiore, K. Iwasawa, G. Malaguti, A. Marconi, J. Poutanen

Research output: Contribution to journalReview articlepeer-review

83 Scopus citations

Abstract

The Circinus Galaxy has been observed, for the first time above 10keV, 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 ∼ 4 × 1024 cm-2, i.e. large enough to completely block the radiation below 10 keV but small enough to permit partial transmission above this energy.

Original languageEnglish (US)
Pages (from-to)L39-L42
JournalAstronomy and Astrophysics
Volume341
Issue number2
StatePublished - Dec 1 1999

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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