Memory in Mergers Major and Minor

Details Memory in Mergers Major and Minor Memory in Mergers Major and Minor

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aspc...92..415b&link_type=abstract

Formation of the Galactic Halo...Inside and Out, ASP Conference Series, Vol. 92, 1996, Heather Morrison and Ata Sarajedini, eds.

Mathematics

Dynamical Systems

22

Scientific paper

Evolution of stellar-dynamical systems is reversible; given enough information on the phase-space structure of a merged system, its past history may be recovered. In mergers of equal-mass galaxies, kinematic memories of the progenitor disks partly survive violent relaxation. Dissipation introduces an irreversible element into galactic mergers, but in practice many stellar memories are left intact. Unequal-mass mergers are less disruptive of primary disks; in 3:1 encounters up to half the remnants retain disk-like kinematics. Accretion of satellite galaxies seems a viable process for producing the stellar halo, and also for heating the thick disk, of the Milky Way galaxy.

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