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

For a PDF version of the article, click here.

CDM, FEEDBACK AND THE HUBBLE SEQUENCE

Jesper Sommer-Larsen, Martin Götz and Laura Portinari


Theoretical Astrophysics Center, Copenhagen, Denmark


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 r1/4 , as observed. The bulge-to-disk ratios of the disk galaxies are consistent with observations and likewise are their integrated BV 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 / LI) ∼ 0.8. The ellipticals and lenticulars have approximately r1/4 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

Next