Publications (11)
Parametrising Star Formation Histories
Vimal Simha, David H. Weinberg, Charlie Conroy +4
We examine the star formation histories (SFHs) of galaxies in smoothed particle hydrodynamics (SPH) simulations, compare them to parametric models that are commonly used in fitting…
The Growth of Central and Satellite Galaxies in Cosmological Smoothed Particle Hydrodynamics Simulations
Vimal Simha, David H. Weinberg, Romeel Dave +3
We examine the accretion and merger histories of central and satellite galaxies in a smoothed particle hydrodynamics (SPH) cosmological simulation that resolves galaxies down to 7e…
Modelling Galaxy Merger Timescales and Tidal Destruction
Vimal Simha, Shaun Cole
We present a model for the dynamical evolution of subhaloes based on an approach combining numerical and analytical methods. Our method is based on tracking subhaloes in an N-body…
Cosmological Constraints from applying SHAM to rescaled cosmological simulations
Vimal Simha, Shaun Cole
We place constraints on the matter density of the Universe and the amplitude of clustering using measurements of the galaxy two-point correlation function from the Sloan Digital Sk…
Bayesian modeling of source confusion in LISA data
Richard Umstätter, Nelson Christensen, Martin Hendry +5
One of the greatest data analysis challenges for the Laser Interferometer Space Antenna (LISA) is the need to account for a large number of gravitational wave signals from compact…
Testing Subhalo Abundance Matching in Cosmological Smoothed Particle Hydrodynamics Simulations
Vimal Simha, David Weinberg, Romeel Dave +3
Subhalo abundance matching (SHAM) is a technique for populating simulated dark matter distributions with galaxies, assuming a monotonic relation between a galaxy's stellar mass or…
LISA source confusion: identification and characterization of signals
Richard Umstätter, Nelson Christensen, Martin Hendry +5
The Laser Interferometer Space Antenna (LISA) is expected to detect gravitational radiation from a large number of compact binary systems. We present a method by which these signal…
Constraining The Early-Universe Baryon Density And Expansion Rate
Vimal Simha, Gary Steigman
We explore constraints on extensions to the standard models of cosmology and particle physics which modify the early-Universe expansion rate S = H'/H (parametrized by the effective…
Equilibrium model prediction for the scatter in the star-forming main sequence
Sourav Mitra, Romeel Davé, Vimal Simha +1
The analytic "equilibrium model" for galaxy evolution using a mass balance equation is able to reproduce mean observed galaxy scaling relations between stellar mass, halo mass, sta…
Constraining The Universal Lepton Asymmetry
Vimal Simha, Gary Steigman
The relic cosmic background neutrinos accompanying the cosmic microwave background (CMB) photons may hide a universal lepton asymmetry orders of magnitude larger than the universal…
A new methodology to test galaxy formation models using the dependence of clustering on stellar mass
David J. R. Campbell, Carlton M. Baugh, Peter D. Mitchell +6
We present predictions for the two-point correlation function of galaxy clustering as a function of stellar mass, computed using two new versions of the GALFORM semi-analytic galax…