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The Local Galactic Escape Velocity1

Published online by Cambridge University Press:  04 August 2017

Bruce W. Carney
Affiliation:
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27514, USA
David W. Latham
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA

Abstract

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From a new photometric and spectroscopic survey of high proper motion stars, combined with previously published work, we find that the local value of the escape velocity from the Galaxy exceeds 500 km s−1. This gives direct dynamical evidence that the total Galactic mass exceeds the mass inside the solar orbit by a factor of at least five.