All Outputs (125)

Constraints on the Galactic bar from the Hercules stream as traced with RAVE across the Galaxy (2014)
Journal Article
Antoja, T., Helmi, A., Dehnen, W., Bienaymé, O., Bland-Hawthorn, J., Famaey, B., Freeman, K., Gibson, B. K., Gilmore, G., Grebel, E. K., Kordopatis, G., Kunder, A., Minchev, I., Munari, U., Navarro, J., Parker, Q., Reid, W. A., Seabroke, G., Siebert, A., Steinmetz, M., …Zwitter, T. (2014). Constraints on the Galactic bar from the Hercules stream as traced with RAVE across the Galaxy. Astronomy and Astrophysics, 563, A60-1-A60-17. https://doi.org/10.1051/0004-6361/201322623

Non-axisymmetries in the Galactic potential (spiral arms and bar) induce kinematic groups such as the Hercules stream. Assuming that Hercules is caused by the effects of the outer Lindblad resonance of the Galactic bar, we model analytically its prop... Read More about Constraints on the Galactic bar from the Hercules stream as traced with RAVE across the Galaxy.

A RAVE investigation on Galactic open clusters: I. Radial velocities and metallicities (2014)
Journal Article
Conrad, C., Scholz, R.-D., Kharchenko, N. V., Piskunov, A. E., Schilbach, E., Röser, S., Boeche, C., Kordopatis, G., Siebert, A., Williams, M., Munari, U., Matijevič, G., Grebel, E. K., Zwitter, T., De Jong, R. S., Steinmetz, M., Gilmore, G., Seabroke, G., Freeman, K., Navarro, J. F., …Siviero, A. (2014). A RAVE investigation on Galactic open clusters: I. Radial velocities and metallicities. Astronomy and Astrophysics, 562, A54. https://doi.org/10.1051/0004-6361/201322070

Context. Galactic open clusters (OCs) mainly belong to the young stellar population in the Milky Way disk, but are there groups and complexes of OCs that possibly define an additional level in hierarchical star formation? Current compilations are too... Read More about A RAVE investigation on Galactic open clusters: I. Radial velocities and metallicities.

The RAVE survey: the Galactic escape speed and the mass of the Milky Way (2014)
Journal Article
Scholz, R.-D., Williams, M. E., Matijevič, G., Bienaymé, O., Wyse, R. F., Piffl, T., Scannapieco, C., Binney, J., Steinmetz, M., Scholz, R. .-D., Williams, M. E. K., De Jong, R. S., Kordopatis, G., Matijevic, G., Bienayme, O., Bland-Hawthorn, J., Boeche, C., Freeman, K., Gibson, B., Gilmore, G., …Zwitter, T. (2014). The RAVE survey: the Galactic escape speed and the mass of the Milky Way. Astronomy and Astrophysics, 562, A91. https://doi.org/10.1051/0004-6361/201322531

We made new estimates of the Galactic escape speed at various Galactocentric radii using the latest data release of the RAdial Velocity Experiment (RAVE DR4). Compared to previous studies we have a database that is larger by a factor of 10, as well a... Read More about The RAVE survey: the Galactic escape speed and the mass of the Milky Way.

The environmental dependence of neutral hydrogen in the GIMIC simulations (2014)
Journal Article
Cunnama, D., Andrianomena, S., Cress, C. M., Faltenbacher, A., Gibson, B. K., & Theuns, T. (2014). The environmental dependence of neutral hydrogen in the GIMIC simulations. Monthly notices of the Royal Astronomical Society, 438(3), 2530-2537. https://doi.org/10.1093/mnras/stt2380

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 of simulated galaxies. This g... Read More about The environmental dependence of neutral hydrogen in the GIMIC simulations.

A new stellar chemo-kinematic relation reveals the merger history of the milky way disk (2014)
Journal Article
Minchev, I., Chiappini, C., Martig, M., Steinmetz, M., De Jong, R. S., Boeche, C., Scannapieco, C., Zwitter, T., Wyse, R. F. G., Binney, J. J., Bland-Hawthorn, J., Bienaymé, O., Famaey, B., Freeman, K. C., Gibson, B. K., Grebel, E. K., Gilmore, G., Helmi, A., Kordopatis, G., Lee, Y. S., …Williams, M. (2014). A new stellar chemo-kinematic relation reveals the merger history of the milky way disk. Astrophysical journal. Letters, 781(1), L20. https://doi.org/10.1088/2041-8205/781/1/l20

The velocity dispersions of stars near the Sun are known to increase with stellar age, but age can be difficult to determine, so a proxy like the abundance of α elements (e.g., Mg) with respect to iron, [α/Fe], is used. Here we report an unexpected b... Read More about A new stellar chemo-kinematic relation reveals the merger history of the milky way disk.

Observationally-motivated analysis of simulated galaxies (2014)
Presentation / Conference Contribution
Gibson, B. K., MacFarlane, B. A., & Miranda, M. S. Observationally-motivated analysis of simulated galaxies. Presented at Proceedings of Science

© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. The spatial and temporal relationships between stellar age, kinematics, and chemistry are a fundamental tool for uncovering the p... Read More about Observationally-motivated analysis of simulated galaxies.

Cloud angular momentum and effective viscosity in global SPH simulations with feedback (2014)
Journal Article
Williamson, D. J., Thacker, R. J., Wurster, J., & Gibson, B. K. (2014). Cloud angular momentum and effective viscosity in global SPH simulations with feedback. Monthly notices of the Royal Astronomical Society, 442(4), 3674-3685. https://doi.org/10.1093/mnras/stu1121

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 population of clouds that is y... Read More about Cloud angular momentum and effective viscosity in global SPH simulations with feedback.

The VMC ESO Public Survey (2013)
Journal Article
Cioni, M.-R. L., Anders, P., Bagheri, G., Bekki, K., Clementini, G., Emerson, J., Evans, C. J., For, B.-Q., De Grijs, R., Gibson, B. K., Girardi, L., Groenewegen, M. A. T., Guandalini, R., Gullieuszik, M., Ivanov, V. D., Kamath, D., Marconi, M., Marquette, J.-B., Miszalski, B., Moore, B., …Zaggia, S. (2013). The VMC ESO Public Survey. The Messenger, 23-25

The VISTA near-infrared YJKs survey of the Magellanic Clouds system (VMC) has entered its core phase: about 50% of the observations across the Large and Small Magellanic Clouds (LMC, SMC), the Magellanic Bridge and Stream have already been secured an... Read More about The VMC ESO Public Survey.

Numerical simulations of bubble-induced star formation in dwarf irregular galaxies with a novel stellar feedback scheme (2013)
Journal Article
Kawata, D., Gibson, B. K., Barnes, D. J., Grand, R. J., & Rahimi, A. (2014). Numerical simulations of bubble-induced star formation in dwarf irregular galaxies with a novel stellar feedback scheme. Monthly notices of the Royal Astronomical Society, 438(2), 1208-1222. https://doi.org/10.1093/mnras/stt2267

To study the star formation and feedback mechanism, we simulate the evolution of an isolated dwarf irregular galaxy (dIrr) in a fixed dark matter halo, similar in size to Wolf–Lundmark–Melotte, using a new stellar feedback scheme. We use the new vers... Read More about Numerical simulations of bubble-induced star formation in dwarf irregular galaxies with a novel stellar feedback scheme.

Phase mixing due to the Galactic potential: steps in the position and velocity distributions of popped star clusters (2013)
Journal Article
Candlish, G. N., Smith, R., Fellhauer, M., Gibson, B. K., Kroupa, P., & Assmann, P. (2014). Phase mixing due to the Galactic potential: steps in the position and velocity distributions of popped star clusters. Monthly notices of the Royal Astronomical Society, 437(4), 3702-3717. https://doi.org/10.1093/mnras/stt2166

As star clusters are expected to form with low star formation efficiencies, the gas in the cluster is expelled quickly and early in their development: the star cluster ‘pops’. This leads to an unbound stellar system, evolving in the Galactic potentia... Read More about Phase mixing due to the Galactic potential: steps in the position and velocity distributions of popped star clusters.

Phase mixing of popped star clusters (2013)
Presentation / Conference Contribution
Candlish, G. N., Smith, R., Fellhauer, M., Gibson, B. K., Kroupa, P., & Assmann, P. (2013, November). Phase mixing of popped star clusters. Presented at XIV Latin American Regional IAU Meeting

As star clusters are expected to form with low star formation efficiencies, the gas in the cluster is expelled quickly and early in their development: the star cluster pops. This leads to an unbound stellar system. Previous N-body simulations have de... Read More about Phase mixing of popped star clusters.

The [α/Fe] ratios of very metal-poor stars within the integrated galactic initial mass function theory (2013)
Journal Article
Recchi, S., Calura, F., Kroupa, P., & Gibson, B. K. (2014). The [α/Fe] ratios of very metal-poor stars within the integrated galactic initial mass function theory. Monthly notices of the Royal Astronomical Society, 437(1), 994-1008. https://doi.org/10.1093/mnras/stt1971

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 if the star formation rate (SFR)... Read More about The [α/Fe] ratios of very metal-poor stars within the integrated galactic initial mass function theory.

Diffuse interstellar band at 8620 Å in RAVE : a new method for detecting the diffuse interstellar band in spectra of cool stars (2013)
Journal Article
Bland-Hawthorn, J., Kos, J., Zwitter, T., Grebel, E. K., Bienayme, O., Binney, J., Freeman, K. C., Gibson, B. K., Gilmore, G., Kordopatis, G., Navarro, J. F., Parker, Q., Reid, W. A., Seabroke, G., Siebert, A., Siviero, A., Steinmetz, M., Watson, F., & Wyse, R. F. G. (2013). Diffuse interstellar band at 8620 Å in RAVE : a new method for detecting the diffuse interstellar band in spectra of cool stars. The Astrophysical journal, 778(2), 86. https://doi.org/10.1088/0004-637x/778/2/86

Diffuse interstellar bands (DIBs) are usually observed in spectra of hot stars, where interstellar lines are rarely blended with stellar ones. The need for hot stars is a strong limitation in the number of sightlines we can observe and their distribu... Read More about Diffuse interstellar band at 8620 Å in RAVE : a new method for detecting the diffuse interstellar band in spectra of cool stars.

The radial velocity experiment (RAVE): Fourth data release (2013)
Journal Article
Kordopatis, G., Gilmore, G., Steinmetz, M., Boeche, C., Seabroke, G. M., Siebert, A., Zwitter, T., Binney, J., De Laverny, P., Recio-Blanco, A., Williams, M. E. K., Piffl, T., Enke, H., Roeser, S., Bijaoui, A., Wyse, R. F. G., Freeman, K., Munari, U., Carrillo, I., Anguiano, B., …Žerjal, M. (2013). The radial velocity experiment (RAVE): Fourth data release. Astronomical Journal, 146(5), 134. https://doi.org/10.1088/0004-6256/146/5/134

We present the stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity), radial velocities, individual abundances, and distances determined for 425,561 stars, which constitute the fourth public data release of the... Read More about The radial velocity experiment (RAVE): Fourth data release.

In the thick of it: metal-poor disc stars in RAVE (2013)
Journal Article
Kordopatis, G., Gilmore, G., Wyse, R., Steinmetz, M., Siebert, A., Bienaymé, O., McMillan, P. J., Minchev, I., Zwitter, T., Gibson, B. K., Seabroke, G., Grebel, E. K., Bland-Hawthorn, J., Boeche, C., Freeman, K. C., Munari, U., Navarro, J. F., Parker, Q., Reid, W. A., & Siviero, A. (2013). In the thick of it: metal-poor disc stars in RAVE. Monthly notices of the Royal Astronomical Society, 436(4), 3231-3246. https://doi.org/10.1093/mnras/stt1804

By selecting in the Radial Velocity Experiment-fourth data release (RAVE-DR4) survey the stars located between 1 and 2 kpc above the Galactic plane, we question the consistency of the simplest three-component model (thin disc, thick disc and halo) fo... Read More about In the thick of it: metal-poor disc stars in RAVE.

Galactic constraints on supernova progenitor models (2013)
Journal Article
Acharova, I. A., Gibson, B. K., Mishurov, Y. N., & Kovtyukh, V. V. (2013). Galactic constraints on supernova progenitor models. Astronomy and Astrophysics, 557, A107. https://doi.org/10.1051/0004-6361/201220944

Aims. To estimate the mean masses of oxygen and iron ejected per each type of supernovae (SNe) event from observations of the elemental abundance patterns in the Galactic disk and constrain the relevant SNe progenitor models. Methods. We undertake a... Read More about Galactic constraints on supernova progenitor models.

Constraining sub-grid physics with high-redshift spatially-resolved metallicity distributions (2013)
Journal Article
Gibson, B. K., Pilkington, K., Brook, C. B., Stinson, G. S., & Bailin, J. (2013). Constraining sub-grid physics with high-redshift spatially-resolved metallicity distributions. Astronomy and Astrophysics, 554, A47. https://doi.org/10.1051/0004-6361/201321239

Aims. We examine the role of energy feedback in shaping the distribution of metals within cosmological hydrodynamical simulations of L*disc galaxies. While negative abundance gradients today provide a boundary condition for galaxy evolution models, i... Read More about Constraining sub-grid physics with high-redshift spatially-resolved metallicity distributions.

The stellar metallicity distribution of disc galaxies and bulges in cosmological simulations (2012)
Journal Article
Calura, F., Gibson, B. K., Michel-Dansac, L., Stinson, G. S., Cignoni, M., Dotter, A., Pilkington, K., House, E. L., Brook, C. B., Few, C. G., Bailin, J., Couchman, H. M. P., & Wadsley, J. (2012). The stellar metallicity distribution of disc galaxies and bulges in cosmological simulations. Monthly notices of the Royal Astronomical Society, 427(2), 1401-1417. https://doi.org/10.1111/j.1365-2966.2012.22052.x

By means of high-resolution cosmological hydrodynamical simulations of Milky Way (MW) like disc galaxies, we conduct an analysis of the associated stellar metallicity distribution functions (MDFs). After undertaking a kinematic decomposition of each... Read More about The stellar metallicity distribution of disc galaxies and bulges in cosmological simulations.

Properties of simulated Milky Way-mass galaxies in loose group and field environments (2012)
Journal Article
Few, C. G., Gibson, B. K., Courty, S., Michel-Dansac, L., Brook, C. B., & Stinson, G. S. (2012). Properties of simulated Milky Way-mass galaxies in loose group and field environments. Astronomy and Astrophysics, 547, Article ARTN A63. https://doi.org/10.1051/0004-6361/201219649

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. Cosmological simulations of M... Read More about Properties of simulated Milky Way-mass galaxies in loose group and field environments.

Calibrating an updated smoothed particle hydrodynamics scheme within GCD+ (2012)
Journal Article
Kawata, D., Okamoto, T., Gibson, B. K., Barnes, D. J., & Cen, R. (2013). Calibrating an updated smoothed particle hydrodynamics scheme within GCD+. Monthly notices of the Royal Astronomical Society, 428(3), 1968-1979. https://doi.org/10.1093/mnras/sts161

We adapt a modern scheme of smoothed particle hydrodynamics (SPH) to our treeN-body/SPH galactic chemodynamics code GCD+. The applied scheme includes implementations of the artificial viscosity switch and artificial thermal conductivity proposed by M... Read More about Calibrating an updated smoothed particle hydrodynamics scheme within GCD+.