The host galaxy of the BL Lacertae object 1ES 0647+250 and its imaging redshift J. K. Kotilainen, T. Hyvönen, R. Falomo, A. Treves and M. Uslenghi A&A, 534 (2011) L2 Published online: 23 September 2011 DOI: 10.1051/0004-6361/201117800