Wandering Stars: An Origin of Escaped Populations

Details Wandering Stars: An Origin of Escaped Populations Wandering Stars: An Origin of Escaped Populations

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1240..301t&link_type=abstract

HUNTING FOR THE DARK: THE HIDDEN SIDE OF GALAXY FORMATION. Edited by Victor P. Debattista and Cristina C. Popescu AIP Conferen

Physics

Gravitation, Tides, Galaxies, Stellar Motion, Relativity And Gravitation, Galaxy Mergers, Collisions, And Tidal Interactions, Dwarf Galaxies, Satellite Orbits

Scientific paper

In [1], we show it is possible to create a wandering/escaped stellar population via a single gravitational interaction between a satellite galaxy and a Milky-Way size galaxy. We also find we can generate a larger escaping population by increasing the size (mass) of the satellite, or the eccentricity of its orbit. The energetic impulse that creates this population is the tidal force experienced by the particles trailing the satellite at perigalacticon. We predict a population of individual stars which have become unbound during the evolution of the Milky Way and which have existed several virial radii outside it for several Gigayears. They can be either energetically unbound (escapers) or bound (wandering).

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