1.6k citations · 17.3k across the 245 of their papers we have counts for
18 papers · 2 filters
Galactic Chemical Evolution
Brad K. Gibson, Yeshe Fenner, Agostino Renda +2
The primary present-day observables upon which theories of galaxy evolution are based are a system's morphology, dynamics, colour, and chemistry. Individually, each provides an imp…
Stellar Halo Constraints on Simulated Late Type Galaxies
Chris B. Brook, Daisuke Kawata, Brad K. Gibson +1
How do late type spiral galaxies form within the context of a CDM cosmology? We contrast N-body, smoothed particle hydrodynamical simulations of galaxy formation which employ two d…
Satellite galaxies in cosmological dark matter halos
Stuart P. D. Gill, Alexander Knebe, Brad K. Gibson
We present preliminary results from a series of high-resolution N-body simulations that focus on 8 dark matter halos each of order a million particles within the virial radius. We…
Anisotropy in the Distribution of Satellite Galaxy Orbits
Alexander Knebe, Stuart P. D. Gill, Brad K. Gibson +3
Nearby clusters such as Virgo and Coma possess galaxy distributions which tend to be aligned with the principal axis of the cluster itself. This has also been confirmed by a recent…
The Galaxy's Eating Habits
M. E. Putman, C. Thom, B. K. Gibson +1
The possibility of a gaseous halo stream which was stripped from the Sagittarius dwarf galaxy is presented. The total mass of the neutral hydrogen along the orbit of the Sgr dwarf…
An HI census of Loose Groups of Galaxies
D. J. Pisano, David G. Barnes, Brad K. Gibson +3
We present results from our Parkes Multibeam HI survey of 3 loose groups of galaxies that are analogous to the Local Group. This is a survey of groups containing only spiral galaxi…
Multi-wavelength Cosmological Simulations of Elliptical Galaxies
Daisuke Kawata, Brad K. Gibson
We study the chemodynamical evolution of elliptical galaxies and their X-ray and optical properties using high-resolution cosmological simulations. Our Tree N-body/SPH code include…
The Chemical Evolution of Magnesium Isotopic Abundances in the Solar Neighbourhood
Y. Fenner, B. K. Gibson, H. -c. Lee +5
The abundance of the neutron-rich magnesium isotopes observed in metal-poor stars is explained quantitatively with a chemical evolution model of the local Galaxy that considers - f…
Is High-Velocity Cloud Complex C Associated with the Galactic Warp?
Daisuke Kawata, Christopher Thom, Brad K. Gibson
We test the hypothesis that High-Velocity gas cloud Complex C is actually a high-latitude spiral arm extension in the direction of the Galactic warp, as opposed to the standard int…
Deriving the Metallicity Distribution Function of Galactic Systems
Yeshe Fenner, Brad K. Gibson
The chemical evolution of the Milky Way is investigated using a dual-phase metal-enriched infall model in which primordial gas fuels the earliest epoch of star formation, followed…
Searching for Variability in the Globular Cluster Messier 4
Robert D. Ferdman, Harvey B. Richer, James Brewer +11
Time-series data taken with the Hubble Space Telescope of a field six core radii (~5') from the center of the globular cluster Messier 4, and covering a period of about 10 weeks in…
The Galactic Inner Halo: Searching for White Dwarfs and Measuring the Fundamental Galactic Constant, Vo/Ro
Jasonjot S. Kalirai, Harvey B. Richer, Brad M. Hansen +9
We establish an extragalactic, zero-motion frame of reference within the deepest optical image of a globular star cluster, an HST 123-orbit exposure of M4 (GO 8679, cycle 9). The l…
The 1000 Brightest HIPASS Galaxies: HI Mass Function and Omega_HI
M. A. Zwaan, L. Staveley-Smith, B. S. Koribalski +37
We present a new accurate measurement of the HI mass function of galaxies from the HIPASS Bright Galaxy Catalog, a sample of 1000 galaxies with the highest HI peak flux densities i…
The cosmic production of Helium
Raul Jimenez, Chris Flynn, James MacDonald +1
We estimate the cosmic production rate of helium relative to metals () using K dwarf stars in the Hipparcos catalog with accurate spectroscopic metallicities. The best fitti…
Galactic Halos in MONDian Cosmological Simulations
Alexander Knebe, Brad K. Gibson
In this paper a series of high-resolution n-body simulations is presented in which the equations of motion have been changed to account for MOdified Newtonian Dynamics (MOND). It i…
Top-Down Fragmentation of a Warm Dark Matter Filament
Alexander Knebe, Julien Devriendt, Brad Gibson +1
We present the first high-resolution n-body simulations of the fragmentation of dark matter filaments. Such fragmentation occurs in top-down scenarios of structure formation, when…
Galactic Halo Stars in Phase Space :A Hint of Satellite Accretion?
Chris B. Brook, Daisuke Kawata, Brad K. Gibson +1
The present day chemical and dynamical properties of the Milky Way bear the imprint of the Galaxy's formation and evolutionary history. One of the most enduring and critical debate…
The 2001 Astronomy Job Market
Brad K. Gibson
An overview of the 2001 astronomy job market is presented, highlighting the recent hiring trends which prospective PhD students and postdocs might like to be aware of. Cosmology an…