The swan song: the disappearance of the nucleus of NGC 4051 and the echo of its past glory

(2)IAS/CNR; 3); (3)Osservatorio Astronomico di Roma; 4); (4)BeppoSAX-SDC; (5)Universita' di Roma 3; (6)University of Southampton; (7)Harvard-Smithsonian CfA; (8)University of Crete; A.Fruscione (7)

arxiv: astro-ph/9807213 · v2 · submitted 1998-07-21 · 🌌 astro-ph

The swan song: the disappearance of the nucleus of NGC 4051 and the echo of its past glory

M.Guainazzi (1) , F.Nicastro (2 , 3) , F.Fiore (3 , 4) , G.Matt (5) , I.McHardy (6) , A.Orr (1)

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P.Barr (1) A.Fruscione (7) I.Papadakis (8) A.N.Parmar (1) P.Uttley (9) G.C.Perola (5) L.Piro (2) ((1)Astrophysics Division ESTEC NL (2)IAS/CNR I (3)Osservatorio Astronomico di Roma (4)BeppoSAX-SDC (5)Universita' di Roma 3 (6)University of Southampton UK (7)Harvard-Smithsonian CfA USA (8)University of Crete GR)

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keywords nucleusobservedactivealongassumingaveragebepposaxbest

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BeppoSAX observed the low-luminous Seyfert 1 Galaxy NGC4051 in a ultra-dim X-ray state. The 2-10 keV flux (1.26 x 10^{-12} erg/cm^2/s) was about 20 times fainter than its historical average value, and remained steady along the whole observation (~2.3 days). The observed flat spectrum (\Gamma ~ 0.8) and intense iron line (EW ~600 eV) are best explained assuming that the active nucleus has switched off, leaving only a residual reflection component visible.

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The swan song: the disappearance of the nucleus of NGC 4051 and the echo of its past glory

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