X-ray spectral components from a broad band BeppoSAX observation of the Seyfert galaxy IC 4329A

From the spectral analysis of a broadband (0.1-200 keV) BeppoSAX observatio n of the Seyfert 1 galaxy IC 4329A, the main results obtained are: a) the a mount of reflection, together with the intensity of the iron K line, indica te a geometry with a solid angle substantially less than 2 pi; b) the power law is affected by a cut off with e-folding energy about 270 keV, the four th individual object so far where this property has been firmly detected; c ) two absorption features at about 0.7 and 1 keV are found, the first corre sponding to a blend of O VI and O VII, the other to a combination of FeL an d NeK edges. Compared to an earlier ASCA observation, when the source was 3 0% fainter, the values of both the relative amount of reflection and the wa rm absorber ionization degree are significantly lower: the comparison is su ggestive of sizeable delay effects in this object, due to geometrical facto rs in the reflection, and to relaxation to equilibrium states in the ioniza tion of the absorber.