6 papers · 1 filter
Constraining dark halos with tidal tails
John Dubinski, Chris Mihos, Lars Hernquist
Massive and extended dark halos can inhibit the formation of long tidal tails in galaxy collisions. We examine this effect using an extensive survey of simulations with different d…
New Statistical Measures of the Lya Forest Spectra for Accurate Comparison to Theoretical Models
J. Miralda-Escude, M. Rauch, W. L. W. Sargent +6
We propose a new method of analysis for the \lya forest, namely to measure the 1-point and 2-point joint probability distribution of the transmitted flux. The results for a sample…
Smooth Particle Hydrodynamics: Models, Applications, and Enabling Technologies
Piet Hut, Lars Hernquist, George Lake +3
We present the results from a two-day study in which we discussed various implementations of Smooth Particle Hydrodynamics (SPH), one of the leading methods used across a variety o…
Hubble Flow Broadening of the Lyman-alpha Forest and its Implications
David H. Weinberg, Lars Hernquist, Neal Katz +2
Lyman-alpha forest lines in QSO spectra have typical widths of 20-50 km/s. Low column density absorbers in cosmological simulations are large, diffuse structures, and the Hubble fl…
Tidal Tales Two: The Effect of Dark Matter Halos on Tidal Tail Morphology and Kinematics
Chris Mihos, John Dubinski, Lars Hernquist
We examine the effect of different dark matter halo potentials on the morphology and kinematics of tidals tails in a merger model of NGC 7252. We find that models of merging galaxi…
Characterization of Lyman Alpha Spectra and Predictions of Structure Formation Models: A Flux Statistics Approach
Rupert A. C. Croft, David H. Weinberg, Lars Hernquist +1
In gravitational instability models, \lya absorption arises from a continuous fluctuating medium, so that spectra provide a non-linear one-dimensional ``map'' of the underlying den…