Browsing Articles by Author "Gibson, Brad K."

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Advanced morphological galaxy classification: a comparison of observed and simulated galaxies

Hambleton, K. M.; Gibson, Brad K.; Brook, C. B.; Stinson, G. S.; Conselice, C. J.; Bailin, J.; Couchman, H.; Wadsley, J. (Royal Astronomical SocietyOxford University Press, 2011)

Encoded within the morphological structure of galaxies are clues related to their formation and evolutionary history. Recent advances pertaining to the statistics of galaxy morphology include sophisticated measures of ...
The [alpha/Fe] ratios of very metal-poor stars within the integrated galactic initial mass function theory

Recchi, S.; Calura, F.; Gibson, Brad K.; Kroupa, P. (Oxford University Press, 2014-01)

The aim of this paper is to quantify the amplitude of the predicted plateau in [α/Fe] ratios associated with the most metal-poor stars of a galaxy. We assume that the initial mass function (IMF) in galaxies is steeper ...
The asymmetric drift, the local standard of rest, and implications from RAVE data

Golubov, O.; Just, A.; Bienayme, O.; Bland-Hawthorn, J.; Gibson, Brad K.; Grebel, E. K.; Munari, U.; Navarro, J. F.; Parker, Q.; Seabroke, G. (EDP Sciences, 2013-09)

Context. The determination of the local standard of rest (LSR), which corresponds to the measurement of the peculiar motion of the Sun based on the derivation of the asymmetric drift of stellar populations, is still a ...
The chemical evolution of globular clusters – II. Metals and fluorine

Sanchez-Blazquez, P.; Marcolini, A.; Gibson, Brad K.; Karakas, A. I.; Pilkington, K.; Calura, F. (Oxford University Press, 2012-01)

In the first paper of this series, we proposed a new framework in which to model the chemical evolution of globular clusters. This model is predicated upon the assumption that clusters form within an interstellar medium ...
Chemodynamics of a simulated disc galaxy: initial mass functions and Type Ia supernova progenitors

Few, C. G.; Courty, S.; Gibson, Brad K.; Michel-Dansac, L.; Calura, F. (Oxford University Press, 2014-11-11)

We trace the formation and advection of several elements within a cosmological adaptive mesh refinement simulation of an L_★ galaxy. We use nine realizations of the same initial conditions with different stellar ...
Cloud angular momentum and effective viscosity in global SPH simulations with feedback

Williamson, David John; Thacker, Robert John, 1970-; Wurster, James Howard; Gibson, Brad K. (Oxford University Press, 2014-08-21)

We examine simulations of isolated galaxies to analyse the effects of localized feedback on the formation and evolution of molecular clouds. Feedback contributes to turbulence and the destruction of clouds, leading to a ...
The cold gas content of bulgeless dwarf galaxies

Pilkington, K.; Gibson, Brad K.; Calura, F.; Brooks, A. M.; Mayer, L.; Brook, C. B.; Stinson, G. S.; Thacker, Robert John, 1970-; Few, C. G.; Cunnama, D. (Wiley-Blackwell, 2011-11)

We present an analysis of the neutral hydrogen (H I) properties of a fully cosmological hydrodynamical dwarf galaxy, run with varying simulation parameters. As reported by Governato et al., the high-resolution, high star ...
The distribution of metals in cosmological hydrodynamical simulations of dwarf disc galaxies

Pilkington, K.; Gibson, Brad K.; Brook, C. B.; Calura, F.; Stinson, G. S.; Thacker, Robert John, 1970-; Michel-Dansac, L.; Bailin, J.; Couchman, H. M. P.; Wadsley, J. (Oxford University Press, 2012-09)

We examine the chemical properties of five cosmological hydrodynamical simulations of an M33-like disc galaxy which have been shown previously to be consistent with the morphological characteristics and bulk scaling relations ...
The environmental dependence of neutral hydrogen in the GIMIC simulations

Cunnama, D.; Andrianomena, S.; Cress, C. M.; Faltenbacher, A.; Gibson, Brad K.; Theuns, T. (Oxford University Press, 2014-01-10)

We use the Galaxies-Intergalactic Medium Interaction Calculation (GIMIC) cosmological hydrodynamic simulation at z = 0 to study the distribution and environmental dependence of neutral hydrogen (H I) gas in the outskirts ...
An H I survey of six Local Group analogs. II. H I properties of group galaxies

Pisano, D. J.; Barnes, David G.; Staveley-Smith, Lister; Gibson, Brad K.; Kilborn, Virginia A.; Freeman, Ken C. (IOP Publishing Limited, 2011-12)

We have conducted an H I 21 cm emission-line survey of six loose groups of galaxies chosen to be analogs to the Local Group. The survey was conducted using the Parkes multibeam instrument and the Australia Telescope Compact ...
Halo expansion in cosmological hydro simulations: toward a baryonic solution of the cusp/core problem in massive spirals

Gibson, Brad K.; Maccio, A. V.; Stinson, G.; Brook, C. B.; Wadsley, J.; Couchman, H. M. P.; Shen, S.; Quinn, T. (American Astronomical SocietyIOP Publishing, 2012-01-01)

A clear prediction of the cold dark matter (CDM) model is the existence of cuspy dark matter halo density profiles on all mass scales. This is not in agreement with the observed rotation curves of spiral galaxies, challenging ...
The halo shape and evolution of polar disc galaxies

Snaith, O. N.; Gibson, Brad K.; Brook, C. B.; Knebe, A.; Thacker, Robert John, 1970-; Quinn, T. R.; Governato, F.; Tissera, P. B. (Oxford University Press, 2012-09)

We examine the properties and evolution of a simulated polar disc galaxy. This galaxy is composed of two orthogonal discs, one of which contains old stars (old stellar disc) and the other both younger stars and cold gas ...
Hierarchical formation of bulgeless galaxies – II. Redistribution of angular momentum via galactic fountains

Gibson, Brad K.; Brook, C. B.; Stinson, G.; Roskar, R.; Wadsley, J.; Quinn, T. (Oxford University Press, 2012-01)

Within a fully cosmological hydrodynamical simulation, we form a galaxy which rotates at 140 km s[superscript −1], and it is characterized by two loose spiral arms and a bar, indicative of a Hubble-type SBc/d galaxy. We ...
MaGICC baryon cycle: the enrichment history of simulated disc galaxies

Brook, C. B.; Stinson, G.; Gibson, Brad K.; Shen, S.; Maccio, A. V.; Obreja, A.; Wadsley, J.; Quinn, T. (Oxford University Press, 2014-10-01)

Using cosmological galaxy formation simulations from the MaGICC (Making Galaxies in a Cosmological Context) project, spanning stellar mass from ∼10⁷ to 3 × 10¹⁰ M_☉, we trace the ...
MAGICC haloes: confronting simulations with observations of the circumgalactic medium at z = 0

Stinson, G. S.; Brook, C.; Prochaska, J. Xavier; Hennawi, Joe; Shen, Sijing; Wadsley, J.; Pontzen, Andrew; Couchman, H. M. P.; Quinn, T.; Maccio, Andrea V.; Gibson, Brad K. (Wiley-Blackwell, 2012-09)

We explore the circumgalactic medium (CGM) of two simulated star-forming galaxies with luminosities L ≈ 0.1 and 1 L^★ generated using the smooth particle hydrodynamic code GASOLINE. These simulations are ...
The main sequence and the fundamental metallicity relation in MaGICC Galaxies: evolution and scatter

Obreja, A.; Brook, C. B.; Stinson, G.; Dominguez-Tenreiro, R.; Gibson, Brad K.; Silva, L.; Granato, G. L. (Oxford University Press, 2014-08-01)

Using cosmological galaxy simulations from the MaGICC project, we study the evolution of the stellar masses, star formation rates and gas-phase abundances of star-forming galaxies. We derive the stellar masses and star ...
Metal-poor lithium-rich giants in the radial velocity experiment survey

Ruchti, Gregory R.; Fulbright, Jon P.; Wyse, Rosemary F. G.; Gilmore, Gerard F.; Grebel, Eva K.; Bienayme, Olivier; Bland-Hawthorn, Joss; Freeman, Ken C.; Gibson, Brad K.; Munari, Ulisse (IOP Publishing Limited, 2011-12-20)

We report the discovery of eight lithium-rich field giants found in a high-resolution spectroscopic sample of over 700 metal-poor stars ([Fe/H] < −0.5) selected from the Radial Velocity Experiment survey. The ...
Metallicity gradients in disks: Do galaxies form inside-out?

Pilkington, K.; Few, C. G.; Gibson, Brad K.; Calura, F.; Michel-Dansac, L.; Thacker, Robert John, 1970-; Molla, M.; Matteucci, F.; Rahimi, A.; Kawata, D. (EDP Sciences, 2012-04)

Aims. We examine radial and vertical metallicity gradients using a suite of disk galaxy hydrodynamical simulations, supplemented with two classic chemical evolution approaches. We determine the rate of change of gradient ...
Modelling self-pollution of globular clusters from asymptotic giant branch stars

Fenner, Y.; Campbell, S.; Karakas, A. I.; Lattanzio, J. C.; Gibson, Brad K. (Royal Astronomical SocietyOxford University Press, 2004)

A self-consistent model of the chemical evolution of the globular cluster NGC 6752 is presented to test a popular theory that observed abundance anomalies are due to ‘internal pollution’ from intermediate-mass asymptotic ...
Properties of simulated Milky Way-mass galaxies in loose group and field environments

Few, C. G.; Gibson, Brad K.; Courty, S.; Michel-Dansac, L.; Brook, C. B.; Stinson, G. S. (EDP Sciences, 2012-11)

Aims. We test the validity of comparing simulated field disk galaxies with the empirical properties of systems situated within environments more comparable to loose groups, including the Milky Way’s Local Group. Methods. ...

Browsing Articles by Author "Gibson, Brad K."

Browsing Articles by Author "Gibson, Brad K."

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