Flyby - Numerical experiments on a galaxy orbiting within a galaxy cluster

Details Flyby - Numerical experiments on a galaxy orbiting within a galaxy cluster Flyby - Numerical experiments on a galaxy orbiting within a galaxy cluster

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167...41m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 41-52.

Astronomy and Astrophysics

Astrophysics

30

Disk Galaxies, Galactic Clusters, Globular Clusters, Orbits, Stellar Systems, Angular Momentum, Dwarf Galaxies, Energy Transfer, Missing Mass (Astrophysics), Stellar Motions

Scientific paper

Dynamical effects on a self-consistent stellar system in orbit around an attracting force center have been studied by means of numerical experiments. Globular clusters in the Galaxy, galaxies within a cluster, and dwarf spheroidal galaxies in orbit around our Galaxy are examples of this dynamical problem. Stars within the galaxy move in the combined self-consistent and external (cluster) force fields, in an accelerated frame, and the galaxy orbit is integrated at the same time. The principal result found is that, in practice, a spherical galaxy either suffers little mass loss (less than 1 percent) or is totally disrupted. A disruption criterion based on the ratio of tidal stress to internal stress within the galaxy describes the results succinctly. This criterion is used to discuss the distribution of dark mass in galaxy clusters. A galaxy envelope expands, rather than being tidally truncated, following a flyby. Spiral galaxies can show tidal damage after flying past the cluster center, even without a close encounter with another galaxy.

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