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[19.04] Solving for Total Masses of Galaxies using Numerical Action Method

E.J. Shaya (GSFC, RITSS & U. of Maryland), S.D. Phelps (Technion Inst., Israel), P.J.E. Peebles (Princeton U.), R.B. Tully (IfA/U. of Hawaii)

We will describe a new technique within the category of Numerical Action Methods in which one solves for acceptable individual total masses of galaxies along with the orbits in an expanding cosmology. We will present calculations done on simulated regions of radius ~5 Mpc around the Milky Way that provide an understanding of the sensitivity of mass determinations on errors in distances and redshifts. In preparation for proper motion measurements to be provided by Space Interferometry Mission (SIM), we examine improvements in mass determinations when proper motions further constrain the orbit solutions.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.