XMM-Newton view of galaxy pairs: activation of quiescent black holes? E. Jiménez-Bailón, N. Loiseau, M. Guainazzi, G. Matt, D. Rosa-González, E. Piconcelli and M. Santos-Lleó A&A, 469 3 (2007) 881-889 Published online: 02 May 2007 DOI: 10.1051/0004-6361:20066761