Galaxy Formation in a Steady State Universe

Disk Galaxy Formation in a Λcdm Universe

We describe hydrodynamical simulations of galaxy formation in a Λ cold dark matter (CDM) cosmology performed using a subresolution model for star formation and feedback in a multiphase interstellar medium (ISM). In particular, we demonstrate the formation of a well-resolved disk galaxy. The surface brightness profile of the galaxy is exponential, with a B-band central surface brightness of 21.0...

Universe: Simulations of Structure and Galaxy Formation

The formation of galaxy disks in a hierarchical Universe

The formation of galactic disks and the efficiency of star formation within them are issues central to our understanding of galaxy formation. We have developed a detailed and versatile model of disk formation which combines the strengths of previous studies of isolated disks with those of hierarchical galaxy formation models. Disk structure is inferred from the distribution of angular momentum ...

Galaxy Formation and Evolution in a LCDM Universe

I explain the motivation of my thesis work and briefly review the relevant background. In the standard paradigm, galaxies are formed within dark matter halos and merge with each other after halo aggregation. In the first part, I briefly summarize the currently favored cosmological models, I introduce linear perturbation theory and I illustrate non-linear evolution with a spherical collapse mode...

Galaxy formation and cosmic-ray acceleration in a magnetized universe

We study the linear magneto-hydrodynamical behaviour of a Newtonian cosmology with a viscous magnetized fluid of finite conductivity and generalise the Jeans instability criterion. The presence of the field favors the anisotropic collapse of the fluid, which in turn leads to further magnetic amplification and to an enhanced current-sheet formation in the plane normal to the ambient magnetic fie...