Kawata, D; (1999) Galaxy formation from a low-spin density perturbation in a CDM universe. PUBL ASTRON SOC JPN , 51 (6) 931 - 941.
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In order to understand the formation process of elliptical galaxies which are not rotationally supported, we carried out numerical simulations of galaxy formation from a density perturbation with a rotation corresponding to a small spin parameter. The three-dimensional TREE N-Body/SPH simulation code used included dark matter and gas dynamics, radiative cooling, star formation, supernova feedback, and metalenrichment. The initial condition was a slowly rotating, top-hat over-dense sphere on which the perturbations expected in a cold dark matter (CDM) universe were superposed. By means of a stellar-population synthesis, we calculated the surface-brightness profile, the metallicity distribution, and the photometric properties of the end-product, and found that these properties quantitatively agree with the observed properties of bright elliptical galaxies. Thus, we conclude that, in a CDM universe, a proto-galaxy having a spin-parameter as small as 0.02 evolves into an elliptical galaxy.
|Title:||Galaxy formation from a low-spin density perturbation in a CDM universe|
|Keywords:||galaxies : elliptical, galaxies : formation, galaxies : structure, methods : numerical, SMOOTHED PARTICLE HYDRODYNAMICS, ELLIPTICAL GALAXIES, DISK GALAXIES, COSMOLOGICAL CONTEXT, SPHERICAL GALAXIES, ANGULAR-MOMENTUM, TIDAL TORQUES, DARK-MATTER, EVOLUTION, MODELS|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics|
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