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BeppoSAX observed the Seyfert 1 galaxy NGC 3783 for ~ 5 days from 1998 June 6to 1998 June 10. The average flux during the observation was F(2-10 keV) ~ 6 X10^{-11} erg cm^-2 s^-1. The long exposure provided a very high qualityspectrum that exhibits all the typical features of Seyfert 1s. The high energycut-off of the intrinsic continuum, at E_c=340+560/-107 keV, was detected forthe first time in this object. During the observation the source showed modestflux variations (~ 20% in 2-10 keV) and spectral variability that can becompletely explained by a change of the intrinsic slope \Delta\Gamma ~ 0.1. NGC3783 is one of the few Seyfert 1s that exhibits a soft emission component inthe BeppoSAX spectrum. This soft excess is well reproduced by a black bodycomponent with temperature kT ~ 0.2 keV. A warm absorber is also required tofit the soft X-ray spectrum. Both reprocessing features, the Compton reflectionhump and the Fe emission line, were detected in our observation. In addition toa narrow iron line (as observed by Chandra) a broad component with sigma=0.72+1.28/-0.27 keV and EW=115+/-76 eV, is required to fit the line. The observedCompton hump and the Fe line are well reproduced with the ionized(lg(xi)=2.73+0.04/-0.05) disc reflection model of Ross & Fabian. In this casethe soft excess observed below 2 keV can be accounted for by the discemissivity and no additional soft X-rays component is required to fit thespectrum.Comment: 13 pages, 14 figures, accepted for publication in A&

The BeppoSAX broad-band spectrum and variability of the Seyfert 1 NGC 3783