Supermassive Black Holes and Their Environments (2008)
Colberg, Joerg M., Di Matteo, Tiziana
We make use of the first high--resolution hydrodynamic simulations of structure formation which self-consistently follows the build up of supermassive black holes introduced in Di Matteo et al....
The Aspen--Amsterdam Void Finder Comparison Project (2008)
Colberg, Joerg M., Pearce, Frazer, Foster, Caroline, Platen, Erwin, Brunino, Riccardo, Neyrinck, Mark, ...
Despite a history that dates back at least a quarter of a century studies of voids in the large--scale structure of the Universe are bedevilled by a major problem: there exist a large number of quite...
On the importance of high redshift intergalactic voids (2008)
Viel, Matteo, Colberg, Joerg M., Kim, Tae-Sun
We investigate the properties of one--dimensional flux ``voids'' (connected regions in the flux distribution above the mean flux level) by comparing hydrodynamical simulations of large cosmological...
Voids in a $\Lambda$CDM Universe (2004)
Colberg, Joerg M., Sheth, Ravi K., Diaferio, Antonaldo, Gao, Liang, Yoshida, Naoki
We study the formation and evolution of voids in the dark matter distribution using various simulations of the popular $\Lambda$ Cold Dark Matter cosmogony. We identify voids by requiring them to be...
Inter-cluster filaments in a $\Lambda$CDM Universe (2004)
Colberg, Joerg M., Krughoff, K. Simon, Connolly, Andrew J.
The large--scale structure (LSS) in the Universe comprises a complicated filamentary network of matter. We study this network using a high--resolution simulation of structure formation of a $\Lambda$...
Clustering of Galaxies in a Hierarchical Universe: III. Mock Redshift Surveys (1998)
Diaferio, Antonaldo, Kauffmann, Guinevere, Colberg, Joerg M., White, Simon D. M.
This is the third paper in a series which combines N-body simulations and semi-analytic modelling to provide a fully spatially resolved simulation of the galaxy formation and clustering processes....
Clustering of Galaxies in a Hierarchical Universe: II. Evolution to High Redshift (1998)
Kauffmann, Guinevere, Colberg, Joerg M., Diaferio, Antonaldo, White, Simon D. M.
In hierarchical cosmologies the evolution of galaxy clustering depends both on cosmological quantities such as Omega and Lambda, which determine how dark matter halos form and evolve, and on the...
Galaxy Clusters in the Hubble Volume Simulations (1998)
Colberg, Joerg M., White, Simon D. M., MacFarland, Thomas J., Jenkins, Adrian, Frenk, Carlos S., Pearce, F. R., ...
We report on analyses of cluster samples obtained from the Hubble Volume Simulations. These simulations, an $\Omega=1$ model named $\tau$CDM and a flat low $\Omega$ model with a cosmological constant...
Clustering of Galaxies in a Hierarchical Universe: I. Methods and Results at z=0 (1998)
Kauffmann, Guinevere, Colberg, Joerg M., Diaferio, Antonaldo, White, Simon D. M.
We introduce a new technique for following the formation and evolution of galaxies in cosmological N-body simulations. Dissipationless simulations are used to track the formation and merging of dark...
Bartelmann, Matthias, Huss, Andreas, Colberg, Joerg M., Jenkins, Adrian, Pearce, Frazer R.
The gravitational lens effect of galaxy clusters can produce large arcs from source galaxies in their background. Typical source redshifts of ~ 1 require clusters at z ~ 0.3 for arcs to form...
Arc statistics with realistic cluster potentials. IV. Clusters in different cosmologies (1997)
Bartelmann, Matthias, Huss, Andreas, Colberg, Joerg M., Jenkins, Adrian, Pearce, Frazer R.
We use numerical simulations of galaxy clusters in different cosmologies to study their ability to form large arcs. The cosmological models are: Standard CDM (SCDM; Omega_0=1, Omega_Lambda=0); tauCDM...