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Mapping the circumnuclear matter of NGC1068 in X-rays

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arxiv astro-ph/9910193 v1 pith:IMIUAJHB submitted 1999-10-11 astro-ph

M.Guainazzi (1) , S.Molendi (2) , P.Vignati (2) , G.Matt (3) , K.Iwasawa (4) ((1) Astrophysics Division , SSD of ESA , Noordwijk , NL; (2) IFC "Occhialini" C.N.R.
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Milano I; (3) Universita' degli Studi "Roma 3" I; (4) University of Cambridge UK)
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keywords variationngc1068allowsalongan-energyapartarchetypicalband
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An-energy dependent variation of the X-ray emission from the archetypical "Compton-thick'' Seyfert 2 galaxy NGC1068 has been observed between two BeppoSAX observations, performed one year apart. This variation (at the 2.6 sigma level) is highest in the 3--10 keV band and declines towards lower and higher energies. The most straightforward explanation is a variation of the primary nuclear continuum, which is scattered along our line of sight by an electron plasma. If this is indeed the case, this evidence allows us to obtain the first direct estimate of the location of the scattering medium, at ~1 pc from the nucleus.

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