Mathematics – Logic
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt.........5g&link_type=abstract
Thesis (PhD). PRINCETON UNIVERSITY, Source DAI-B 60/04, p. 1649, Oct 1999, 114 pages.
Mathematics
Logic
8
Cluster Galaxies
Scientific paper
This dissertation focuses on the problem of tidal effects on the evolution of galaxies in clusters. The topic is motivated by the wealth of observational evidence, collected using both the Hubble Space Telescope and ground-based telescopes, that a strong morphological evolution of galaxies has occurred in clusters between redshift 0.5 and now. A possible theoretical explanation involves tidal interactions between galaxies and the evolving potential of the cluster, including the interactions between galaxies themselves. Large particle- mesh simulations are performed to generate cosmologically viable clusters of galaxies in three different models of structure formation. The tidal field from these clusters is used to model the dynamics of individual galaxies using a high resolution N-body code. The results demonstrate that large spiral galaxies retain their stellar disks but in a significantly thickened form. A large fraction of the gas may be lost due to interaction with the intracluster media or in interpenetrating collisions with other galaxies. As the disks become gravitationally stable, the remaining gas is unlikely to form new stars. Dark matter halos are stripped at a radius of about 30 kpc, regardless of their initial size. The effect of the tidal interactions is to transform a spiral galaxy into an S0, but not elliptical galaxy. Dwarf spheroidal galaxies are completely torn apart due to their low central density. Their unbound stars contribute to the diffuse cluster light. With a degree of uncertainty, several lines of reasoning favor the low density cosmological models as fitting observations better.
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