1205.6864 (Roeland P. van der Marel et al.)

The M31 Velocity Vector. II. Radial Orbit Towards the Milky Way and Implied Local Group Mass    [PDF]

Roeland P. van der Marel, Mark Fardal, Gurtina Besla, Rachael L. Beaton, Sangmo Tony Sohn, Jay Anderson, Tom Brown, Puragra Guhathakurta