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Title: THE MASS OF THE MILKY WAY AND M31 USING THE METHOD OF LEAST ACTION

We constrain the most likely range of masses for the Milky Way (MW) and M31 using an application of the numerical action method (NAM) that optimizes the fit to observed parameters over a large ensemble of NAM-generated solutions. Our 95% confidence level mass ranges, 1.5-4.5 × 10{sup 12} M{sub ☉} for MW and 1.5-5.5 × 10{sup 12} M{sub ☉} for M31, are consistent with the upper range of estimates from other methods and suggests that a larger proportion of the total mass becomes detectable when the peculiar motions of many nearby satellites are taken into account in the dynamical analysis. We test the method against simulated Local Group catalogs extracted from the Millennium Run to confirm that mass predictions are consistent with actual galaxy halo masses.
Authors:
 [1] ;  [2] ;  [3]
  1. Physics Department, Technion, Haifa 32000 (Israel)
  2. Physics Department and the Asher Space Science Institute, Technion, Haifa 32000 (Israel)
  3. Departement de Physique Theorique and Center for Astroparticle Physics, Universite de Geneva, CH-1211 Geneva (Switzerland)
Publication Date:
OSTI Identifier:
22270833
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 775; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; CALCULATION METHODS; COMPUTERIZED SIMULATION; COSMOLOGY; MASS; MILKY WAY