Radially extended kinematics and stellar populations of the massive ellipticals NGC 1600, NGC 4125, and NGC 7619 - Constraints on the outer dark halo density profileS. B. Pu, R. P. Saglia, M. H. Fabricius, J. Thomas, R. Bender and Z. HanA&A, 516 (2010) A4DOI: https://doi.org/10.1051/0004-6361/201014395