Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phdt........13c&link_type=abstract
Proquest Dissertations And Theses 2008. Section 0036, Part 0606 162 pages; [Ph.D. dissertation].United States -- California: Un
Physics
3
Galaxy Mergers, Fundamental Plane, Galaxy Formation, Scaling Laws
Scientific paper
Galaxy mergers are a major force in the formation of galaxies. We study a large suite of hydrodynamical galaxy merger simulations in order to better understand how mergers could lead to the development and evolution of galaxy scaling laws. We begin by constructing a physically-motivated analytical model that predicts the properties of the remnants of galaxy mergers. The free parameters in this model are calibrated using the simulation set. Once developed, the merger model is applied to two Semi-Analytic Models of galaxy formation and used to study the production and evolution of elliptical galaxy scaling laws via merging. We demonstrate that major mergers of disk galaxies are capable of producing the observed scaling relations. The tilt of the fundamental plane and the rotation of the size-mass relation from that of disks, are the result of a gas gradient in the progenitor galaxies.
We also demonstrate that galaxy mergers are capable of reproducing the observed high-redshift Tully-Fisher law outliers along with the tight S 0.5 -stellar mass relation. Furthermore, we show using the simulations that S 0.5 tracks the total enclosed mass including the contribution from dark matter.
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