We investigate the baryon fraction in dark matter haloes formed in non-radiative gasdynamical simulations of the ΛCDM cosmogony. By combining a realisation of the Millennium Simulation (Springel et al.) with a simulation of a smaller volume focussing on dwarf haloes, our study spans five decades in halo mass, from 10 h M⊙ to 10 h M⊙. We find that the baryon fraction within the halo virial radiu...

We present decompositions of the rotation curves of three spiral galaxies at redshifts z ∼ 0.7 and 1 into contributions by their bulges, disks, and dark halos, respectively. In order to set constraints on the degeneracy of the decompositions we interpret the morphology of the spiral structures quantitatively in the framework of density wave theory. Galaxy models constrained in such a way show t...

We present decompositions of the rotation curves of three spiral galaxies at redshifts z ∼ 0.7 and 1 into contributions by their bulges, disks, and dark halos, respectively. In order to set constraints on the degeneracy of the decompositions we interpret the morphology of the spiral structures quantitatively in the framework of density wave theory. Galaxy models constrained in such a way show t...

Views of unexplored areas, be they in science or geography, are constructed either from extrapolation of known experiences or from wild fantasy. Earthbound cosmologists have viewed our solar system from both perspectives. With the advent of unmanned probes, results have been obtained which have forced the abandoning of supposed similarities with our own earth as well as causing the destruction ...

In a recent paper, we suggested that the density fluctuation spectra arising from power-law (or extended) inflation, which are tilted with respect to the Harrison–Zel’dovich spectrum, may provide an explanation for the excess large scale clustering seen in galaxy surveys such as the APM survey. In the light of the new results from COBE, we examine in detail here cold dark matter cosmogonies bas...