M31 Transverse Velocity and Local Group Mass from Satellite Kinematics

@article{vanderMarel2007M31TV,
  title={M31 Transverse Velocity and Local Group Mass from Satellite Kinematics},
  author={Roeland P. van der Marel and Puragra Guhathakurta},
  journal={The Astrophysical Journal},
  year={2007},
  volume={678},
  pages={187 - 199}
}
We present several different statistical methods to determine the transverse velocity vector of M31. The underlying assumptions are that the M31 satellites on average follow the motion of M31 through space and that the galaxies in the outer parts of the Local Group on average follow the motion of the Local Group barycenter through space. We apply the methods to the line-of-sight velocities of 17 M31 satellites, to the proper motions of the two satellites M33 and IC 10, and to the line-of-sight… 

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