The complex 0 . 1 – 200 keV spectrum of the Seyfert 1 Galaxy NGC 4593

We report on the first observation of the Seyfert 1 galaxy NGC 4593 in the 0.1–200 keV band, performed with the BeppoSAX observatory. Its spectral components are for the first time simultaneously measured: a power-law with photon spectral index Γ ' 1.9; the Compton-reflection of the primary power-law; a moderately broad (σ > 60 eV) Kα fluorescent line from neutral iron; and an absorption edge, whose threshold energy is consistent with K-shell photoionization from Ovii. The amount of reflection and the iron line properties are consistent with both being produced in a plane-parallel, X-ray illuminated relativistic accretion disc surrounding the nuclear black hole, seen at an inclination of ' 30◦. Any cutoff of the intrinsic continuum is constrained to lay above 150 keV. The claim for a strongly variable soft excess is dismissed by our data and by a reanalysis of archival ASCA and ROSAT data.