The XMM-Newton view of the X-ray halo and jet of NGC 6251 R. M. Sambruna, M. Gliozzi, D. Donato, F. Tavecchio, C. C. Cheung and R. F. Mushotzky A&A, 414 3 (2004) 885-894 Published online: 27 January 2004 DOI: 10.1051/0004-6361:20031657