Change in Mass and Energy of Galaxies through Mutual Encounters

Details Change in Mass and Energy of Galaxies through Mutual Encounters Change in Mass and Energy of Galaxies through Mutual Encounters

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...511..625f&link_type=abstract

The Astrophysical Journal, Volume 511, Issue 2, pp. 625-638.

Astronomy and Astrophysics

Astronomy

9

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Evolution, Galaxies: Interactions, Galaxies: Kinematics And Dynamics, Methods: Numerical

Scientific paper

We present the result of a systematic study of the evolution of galaxies through their encounters. We performed a series of numerical experiments of encounters of two galaxies and determined how the change of mass and binding energy depends on galaxy models and collision parameters. Using both numerical experiments and analytic theory, we found that the relation between the relative change of energy delta_E and that of mass delta_M of one galaxy per unit time is expressed as delta_E~=1.5delta_M if the evolution is solely due to encounters. This result suggests that when galaxies in a cluster evolve mainly through frequent encounters with each other, a relation sigma^4~M develops between the mass M and the velocity dispersion sigma of the galaxies. If we assume that M/L is constant, this relation is equivalent to the Faber-Jackson relation, sigma^4~L, which is observed for elliptical galaxies in a cluster of galaxies.This agreement with observations suggests that the encounters of galaxies play an important role in the evolution of galaxies in clusters.

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