Colin Degraf

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Using an isolated Milky Way-mass galaxy simulation, we compare results from nine state-of-the-art gravitohydrodynamics codes widely used in the numerical community. We utilize the infrastructure we have built for the AGORA High-resolution Galaxy Simulations Comparison Project. This includes the common disk initial conditions, common physics models (e.g.,(More)
Large-scale N-body simulations play an important role in advancing our understanding of the formation and evolution of large structures in the universe. These computations require a large number of particles, in the order of 10-100 of billions, to realistically model phenomena such as the formation of galaxies. Among these particles, black holes play a(More)
Large-scale N-body simulations play an important role in advancing our understanding of the formation and evolution of large structures in the universe. These computations require a large number of particles, in the order of 10-100 of billions, to realistically model phenomena such as the formation of galaxies. Among these particles, black holes play a(More)
We investigate the properties of haloes, galaxies and black holes to z= 0 in the high-resolution hydrodynamical simulation MassiveBlack-II (MBII) which evolves a cold dark matter cosmology in a comoving volume Vbox = (100Mpc h−1)3. MBII is the highest resolution simulation of this size which includes a self-consistent model for star formation, black hole(More)
We examine predictions for the quasar luminosity functions (QLFs) and quasar clustering at high redshift (z ≥ 4.75) using MassiveBlack, our new hydrodynamic cosmological simulation which includes a self-consistent model for black hole (BH) growth and feedback. We show that the model reproduces the Sloan QLF within observational constraints at z ≥ 5. We find(More)
We investigate the properties of haloes, galaxies and black holes to z= 0 in the high-resolution hydrodynamical simulation MassiveBlack-II (MBII) which evolves a cold dark matter cosmology in a comoving volume Vbox = (100Mpc h ). MBII is the highest resolution simulation of this size which includes a self-consistent model for star formation, black hole(More)
Current methods for lateral force calibration are often time-consuming, expensive, or cause significant wear of the tip. A quick and simple alternative is presented in which the linear relationship between force and voltage is exploited. The technique is independent of the shapes of the sample and cantilever and eliminates common problems, while maintaining(More)
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