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arxiv: astro-ph/9712248 · v1 · pith:PCUI2CKYnew · submitted 1997-12-18 · 🌌 astro-ph

1H0419-577: a two-state Seyfert Galaxy?

M.Guainazzi (1) , A.Comastri , G.Stirpe (2) , W.N.Brandt (3) , A.Parmar (4) , E.M.Puchnarewicz (5) ((1) Beppo-SAX SDC , Roma , Italy
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(2) Osservatorio Astronomico di Bologna (3) Dep. of Astron. & Astophys. Penn State Un. U.S.A. (4) SSD/ESTEC. Noordwijk The Netherlands (5) Mullard Space Science Laboratory Un. College London Dorking U.K.)
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keywords h0419-577lineobservationradio-quietseyfertspectrumbehaviorbepposax
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The preliminary results of the BeppoSAX observation of the radio-quiet AGN 1H0419-577 are presented. Despite its broad line optical spectrum, the intermediate X-ray spectrum (i.e. 2--10 keV) is flatter than typically observed in Seyfert 1s and no iron line is significantly detected. Even more intriguingly, a 1992 ROSAT pointed observation suggests a dramatic (~ 1) change in the spectral shape for E < 2 keV. Such behavior is briefly discussed in the framework of our current understanding of Comptonization scenarios in the nuclear regions of radio-quiet AGN.

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