An enshrouded AGN in the merging starburst system Arp~299 revealed by   BeppoSAX
  Using a long (=150 ksec), broad-band (0.1--40 keV) BeppoSAX observation of the merging starburst system Arp 299 (=IC 694 + NGC 3690) we found the first unambiguous evidence of the presence of a deeply buried (N_H = 2.5E24 cm-2) AGN having an intrinsic luminosity of L(0.5-100 keV) = 1.9E43 cgs. The X-ray spectral properties of this AGN are discussed in detail as well as the thermal component detected at soft X-ray energies which, most likely, is associated with the starburst. 
R. Della Ceca, L. Ballo, F. Tavecchio, L. Maraschi, P.O. Petrucci, L.   Bassani, M. Cappi, M. Dadina, A. Franceschini, G. Ma...