The dust coma of the active Centaur P/2004 A1 (LONEOS): a CO-driven environment? E. Mazzotta Epifani, P. Palumbo, M. T. Capria, G. Cremonese, M. Fulle and L. Colangeli A&A, 460 3 (2006) 935-944 Published online: 13 September 2006 DOI: 10.1051/0004-6361:20065189