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Non-linear Stochastic Galaxy Biasing in Cosmological Simulations
R. S. Somerville, G. Lemson, Y. Sigad +3
We study the biasing relation between dark-matter halos or galaxies and the underlying mass distribution, using cosmological -body simulations in which galaxies are modelled via…
Cosmic Flows 99: Conference Summary
Avishai Dekel
I address the following issues: All bulk velocity measurements (but one) are consistent with our standard gravitational instability theory. New accurate data and reconstruction met…
Cluster versus POTENT Density and Velocity Fields: Cluster Biasing and Omega
E. Branchini, I. Zehavi, M. Plionis +1
The density and velocity fields as extracted from the Abell/ACO clusters are compared to the corresponding fields recovered by the POTENT method from the Mark~III peculiar velociti…
Galaxy Interactions and Starbursts at High Redshift
R. S. Somerville, G. Rosenfeld, T. S. Kolatt +3
Using high resolution N-body simulations with hydrodynamics and star formation, we investigate interactions and the resulting starbursts in galaxies with properties typical of $z\s…
Cosmological Parameters and Power Spectrum from Peculiar Velocities
Idit Zehavi, Avishai Dekel
The power spectrum of mass density fluctuations is evaluated from the Mark III and the SFI catalogs of peculiar velocities by a maximum likelihood analysis, using parametric models…
Profiles of dark haloes: evolution, scatter, and environment
James S. Bullock, Tsafrir S. Kolatt, Yair Sigad +5
We study dark-matter halo density profiles in a high-resolution N-body simulation of an LCDM cosmology. Our statistical sample contains ~5000 haloes in the range 10^{11}-10^{14} M_…
Young galaxies: what turns them on?
Tsafrir S. Kolatt, James S. Bullock, Rachel S. Somerville +8
Lyman break galaxies (LBGs) at exhibit number densities and clustering similar to local galaxies; however, their star formation rates (SFRs) are much higher. We ex…
Large-Scale Power Spectrum and Cosmological Parameters from SFI Peculiar Velocities
Wolfram Freudling, Idit Zehavi, Luiz N. da Costa +7
We estimate the power spectrum of mass density fluctuations from peculiar velocities of galaxies by applying an improved maximum-likelihood technique to the new all-sky SFI catalog…
Evidence for a Positive Cosmological Constant from Flows of Galaxies and Distant Supernovae
Idit Zehavi, Avishai Dekel
Recent observations of high-redshift supernovae seem to suggest that the global geometry of the Universe may be affected by a `cosmological constant', which acts to accelerate the…