Very deep spectroscopy of the Coma cluster line of sight: exploring new territories C. Adami, V. Le Brun, A. Biviano, F. Durret, F. Lamareille, R. Pelló, O. Ilbert, A. Mazure, R. Trilling and M. P. Ulmer A&A, 507 3 (2009) 1225-1241 Published online: 01 October 2009 DOI: 10.1051/0004-6361/200912228