Activity of the Seyfert galaxy neighbours E. Koulouridis, M. Plionis, V. Chavushyan, D. Dultzin, Y. Krongold, I. Georgantopoulos and J. León-Tavares A&A, 552 (2013) A135 Published online: 17 April 2013 DOI: 10.1051/0004-6361/201219606