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XMM-Newton view of galaxy pairs: activation of quiescent black holes?

We report on XMM-Newton observations of three nearby galaxy pairs, AM0707-273, AM1211-465, and AM2040-674. All six galaxies were previously classified as HII galaxies based on optical and IR spectroscopic analysis. All galaxies were detected with XMM-Newton and each member was isolated and analyzed independently. The X-ray spectra reveal strong evidence of AGN activity in the NE member of AM1211-465 pair. We measured a luminosity of 1.94 +0.11 −0.15 × 10 42 erg/s in the 2–10 keV band and the presence of a neutral FeKα line with a confidence level of 98.8%. The high nH value, 2.2 ± 0.2 × 10 22 cm −2 , would explain the misclassification of the source. Marginal evidence of AGN nature was found in the X-ray spectra of AM1211-465SW and AM0707-273E. The X-ray emission of the three remaining galaxies can be explained by starburst activity.