Dark energy and extended dark matter halos A. D. Chernin, P. Teerikorpi, M. J. Valtonen, V. P. Dolgachev, L. M. Domozhilova and G. G. Byrd A&A, 539 (2012) A4 Published online: 17 February 2012 DOI: 10.1051/0004-6361/201117143