Published in Astrophysics and Space Science, v. 281, Issue 1, p. 519-524 (2002).
http://arxiv.org/abs/astro-ph/0206462

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Abstract: We have performed TreeSPH simulations of galaxy formation in a standard ΛCDM cosmology, including effects of star formation, energetic stellar feedback processes and a meta-galactic UV field, and obtain a mix of disk, lenticular and elliptical galaxies. The disk galaxies are deficient in angular momentum by only about a factor of two compared to observed disk galaxies. The stellar disks have approximately exponential surface density profiles, and those of the bulges range from exponential to r^1/4 , as observed. The bulge-to-disk ratios of the disk galaxies are consistent with observations and likewise are their integrated B − V colours, which have been calculated using stellar population synthesis techniques. Furthermore, we can match the observed I-band Tully-Fisher (TF) relation, provided that the mass-to-light ratio of disk galaxies is (M / L_I) ∼ 0.8. The ellipticals and lenticulars have approximately r^1/4 stellar surface density profiles, are dominated by non-disklike kinematics and flattened due to non-isotropic stellar velocity distributions, again consistent with observations.

Keywords: Cosmology, galaxy formation, numerical methods

Table of Contents

INTRODUCTION

THE SIMULATIONS

RESULTS

REFERENCES