An XMM-Newton Survey of Ultra-Luminous Infrared Galaxies
V. Braito, A. Franceschini, R. Della Ceca, L. Bassani, M. Cappi, P. Malaguti, G. G. C. Palumbo, M. Persic, G. Risaliti, M. Salvati, P. Severgnini
Abstract
We present preliminary results of XMM-Newton observations of 5 Ultra-luminous Infrared Galaxies (ULIRGs), part of a mini-survey program dedicated to 10 ULIRGs selected from the bright IRAS sample. For 3 of them (IRAS 20551-4250, IRAS 19254-7245 and Mkn 231) we find strong evidence for the presence of a hidden AGN, while for two others (IRAS 20110-4156 IRAS 22491-1808) the S/N ratio of the data does not allow us to be conclusive. In particular, we have detected a strong Fe-K line in the X-ray spectra of IRAS19254-7245, with an equivalent width (~2 keV) suggestive that most of the energy source in this object is due to a deeply buried AGN.
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